System for sensing the position of a movable bar

摘要

A system for sensing the position of a movable bar is provided. The system includes a rotatable body positioned for rotation about an axis. The rotatable body is mechanically coupled with the movable bar such that the rotatable body rotates about the axis as the movable bar moves. A sensor is mechanically coupled with the rotatable body such that the sensor senses the rotation of the rotatable body as the movable bar moves.