| 摘要 |
PURPOSE:To simplify the constitution of a display circuit and to reduce costs, by making the winding length in each one rotation of a winding drum numerically coincident beforehand with the number of the output pulse signals of a number of revolution-pulse signal converter. CONSTITUTION:Winding grooves 21a are inscribed on the outside surface of a winding drum 21, and as the winding drum rotates, a rope 6 is wound to lift a material to be lifted. If the number of pulse signals of a number of revolution- pulse signal converter which operates cooperatively with the drum 21 is beforehand so set as to coincide with the winding length of the rope, the length of the material to be lifted is determined from the count value of the number of pulses. The constitution of a display circuit is thus simplified. |
