Lumber Retrieval System for a Centrally Located Saw

Lumber retrieval systems and methods feed a centrally located saw with a predetermined assortment of boards picked from certain stations distributed at either side of the saw. In some examples， an overhead trolley system carries individual boards in a certain sequence from chosen stations to a board-receiving apparatus. The board-receiving apparatus， in turn， feeds the boards to the saw. The saw then cuts the boards into board segments， which can be used for making prefabricated trusses and wall panels. In some examples， the trolley system has a laser-scanning feature for determining the location of the next-to-pick board while simultaneously transporting the board currently heading to the board-receiving apparatus. In some examples， the trolley system includes two board carriers each of which are dedicated or assigned to certain stations. In some examples， one carrier serves as backup for the other one when one of the carriers is broken or otherwise inactive.