Dual Robot Arm Retraction Layout for Compact Substrate Handling

The robot arms are designed with unequal link lengths where the first upper arm and first forearm have different effective lengths, as do the second upper arm and second forearm. This asymmetric configuration allows the end effectors to be positioned in retracted positions for stacking substrates while minimizing the footprint and workspace volume required for substrate transport operations.

The robot arms are configured to dynamically position end effectors between retracted positions (for stacking substrates) and extended positions (for transport). The arms can extend from retracted positions in first direction along parallel first paths and in second direction along second paths, enabling adaptive movement patterns that reduce footprint while maintaining operational capability.

The end effectors are positioned in retracted positions for stacking substrates before transport operations begin. This preliminary positioning allows substrates to be stacked in a compact configuration, and when transport is required, the arms can efficiently extend along predetermined parallel paths, reducing the time penalty associated with moving between retracted and extended positions.

The robot arms are configured to extend end effectors along parallel first paths in a first direction and along second paths in a second direction. This multi-dimensional path configuration allows efficient substrate transport while maintaining compact workspace volume, as the parallel paths enable coordinated movement that minimizes travel distance and time.