Buffer apparatus for article processing systems

Abstract

A system for providing a buffer between upstream and downstream article processing lines employs a storage and retrieval machine operable in a storage mode to store in a matrix of storage bins unit loads of articles received from the upstream line during an interruption in the processing rate of the downstream line; and, operable in a retrieval mode to supply the stored articles to the downstream line when required. The storage machine includes separately driven components consisting of a horizontally movable carriage, a vertically movable elevator mounted on the carriage, and a bi-laterally movable load carrying table mounted on the elevator. Movements of these components are regulated by a control which counts the number of unit loads in storage and computes, in accordance with predetermined storage and retrieval sequences, the location in the matrix of the storage bin for the next storage or retrieval operation and directs the machine table to that location. In the storage mode, each successive storage operation of the machine is initiated in response to the presence of a group of articles, or unit load, at a transfer station located adjacent the entrance to the downstream line; and, in the retrieval mode, each successive operation of the machine occurs in response to the deposit of a unit load on the transfer station by the table of the machine.