Horizontal sensor and variable pattern for detecting vertical stacker position

摘要

This invention provides an effective and inexpensive stacker tray assembly apparatus and method for determining an elevator stacker tray location in the assembly. A sensor is attached to the stacker tray so that it is in sensing proximity to a continuous variable slanted shape marker. The marker has measurables therein where the measurables decrease in measurement as they proceed from a bottom of the marker to an upper portion of the marker. The sensor is substantially shorter than a length of the movable elevator stacker tray travel.