B - Operations – Transporting – 65 – G
Patent
B - Operations, Transporting
65
G
186/50
B65G 35/06 (2006.01) B65G 1/04 (2006.01)
Patent
CA 1081140
HIGH DENSITY STACKER CRANE STORAGE SYSTEM Abstract of the Disclosure A stacker crane storage and retrieval system comprises a storage rack comprising a plurality of posi- tions defined by vertically and horizontally addressed storage areas, a stacker crane, and a track extending horizontally along the rack on which the stacker crane is adapted to be moved. A table is mounted for vertical movement on a vertical track on the stacker. A sensing scale extends along each track. Each scale includes a Gray code array including alternately dark and light increments, each increment defining a bit. An optical source provided on the crane and the table, respectively, includes a source of radiant energy adapted to direct radiant energy against its respective scale, and in- cludes infrared sensor means for sensing the area being illuminated by its respective optical source. A com- parator comprises the reading of said infrared sensors with a master position corresponding to the desired position of the crane and table, and provides a signal for driving the respective drives of the crane and the table to position the crane and table at the desired position. -i-
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