Position control device for movable member

摘要

A position control device for controlling a position of a movable member has high durability and is free from a hunting phenomenon. Electric contacts arranged in a row at a given pitch are respectively connected to the nodes between series-connected resistors and first and second brushes interlocked with the movable member can contact the adjoining two of the electric contacts at a time such that discrete two voltage signals are generated at the first and second brushes. A pair of comparators compare these voltage signals with a voltage signal corresponding to a target position where the movable member is to be stopped and a driving means for the movable member stops its operation when the former voltage signals sandwitch the latter voltage signal. A third brush capable of contacting index terminals in response to the movement of the movable member and a pair of memorizing means capable of memorizing the outputs of the comparators each time the third brush contacts one of the index terminals are provided for minimizing the error in the position where the movable member is actually stopped.