When a box of products is taken out, the empty box robot moves to the left and takes the empty box to the empty box blanking bracket. The product box goes up one level, and the empty box goes down one level. (cycle)
When a box of products finished, empty box robot moved to the left, empty box pick-up into the empty box under the material carrier, the product box rose one layer, empty box dropped a layer. (Loop)
When a box of products is taken out, the empty box manipulator moves to the left and puts the empty box into the empty box blanking bracket. The product box rises one layer and the empty box falls one layer. (cycle)