| 摘要 |
PURPOSE:To prevent an erroneous detection pulse generated at an edge part of a gear during low-speed rotation, etc., by providing two pulse detectors corresponding to a gear or slitter fitted to a body of revolution at such positions that their output signals are out of phase by a 90 deg. electric angle. CONSTITUTION:Contactless switches SW2 and SW3 are provided to obtain pulses outputs according to projections and recesses of the tooth part of a gear 1 provided on the shaft of a body of revolution, and their fitting positions are so determined that their generated pulse signals are out of phase by a 90 deg. electric angle. The output A of the SW2 is inputted to a differentiator 4 to obtain a differential output C, which is inputted to a rectifying circuit 6, whose rectification output E (E') is inputted to a terminal S of a flip-flop F.F8. The detection signal B of the SW3, on the other hand, is inputted to a differentiator 5 to obtain a differential output D, which is inputted to a rectifying circuit 7, whose retification output F (F') is inputted to a terminal R of the F.F circuit 8. Thus, the interval between parts H and H' corresponding to a 90 deg. out-of- phase electric angle, so an output waveform G (G') at the output terminal Q of the F.F 8 is detected accurately even when there are parts H and H', and I and I'. |
