Method and apparatus for automated parts for storage and retrieval

A method of precisely moving a preselected parts bin among several parts bins on a conveyor to a predetermined location comprising the following steps:

• (a) loading an electronic controller with data relating to the predetermined location and the preselected parts bin;
• (b) setting a first movement speed for a drive mechanism which moves said parts bins;
• (c) monitoring a rapidly rotating coarse position sensor as said selected parts bin approaches the predetermined location, said coarse position sensor having a shaft that undergoes numerous revolutions for each complete rotation of said conveyor;
• (d) setting a second movement speed for said drive mechanism;
• (e) activating a final approach sensor as the preselected parts bin approaches the predetermined location;
• (f) monitoring said coarse position sensor as the final approach sensor senses the approach of said preselected location;
• and
• (g) arresting movement of the drive mechanism and therefore said parts bins.

A method for accurate positioning of a selected bin of a conveyor at a desired location, comprising the steps of:

• driving said conveyor in a given direction at a first speed;
• detecting, with a coarse sensor, entry into a first detection condition of a next prior bin before said selected bin, said coarse sensor having a shaft that undergoes numerous revolutions for each complete location of said conveyor;
• monitoring a desired final approach sensor;
• reducing said first speed to a lower second speed;
• detecting, with said final approach sensor, entry of said selected bin into a second detection condition;
• and
• reducing said second speed to zero.