Sensor System for Multi Axis Automated Assembly and Manufacturing Machines

Abstract

Many computer controlled multi-axis machines operate under 'open loop' control. The exact position in space of the end effector cannot always be sensed directly. The controlling software makes a calculated estimate of where the tool head should be by monitoring sensors on axes that track linear translation and rotations of shafts/gears. For some applications this may be appropriate; however positional errors occur, and may accumulate. There exists a need for a sensor system that provides direct feedback of the end effector's spatial coordinates for machining and assembly applications.