US Patent 9626714 Laser mobile put wall

A method of fulfilling orders and order fulfillment system includes a mobile assembly cart having a plurality of order assembly positions and a pointer assembly. The pointer assembly generates a beam and directs the beam to at least one of said assembly positions for selectively identifying at least one of the assembly positions for putting an item to or retrieving an order from each identified position. The assembly cart can be positioned with respect to the pointer assembly for the picking or putting and moved away from the pointer assembly after the picking or putting.