Patent ID: 8033378

Claim:
A buffer system for adjusting first-in first-out, the system comprising: a frame; a driving unit secured to the frame via a rail, wherein the rail is movable within a slot located within the frame; a buffer body supporting a plurality of buffer layers, each buffer layer having shafts and rollers fitted and fixed to the shafts so as to temporarily store or transfer substrates, wherein the buffer body is vertically movable relative to the frame; a vertically moving unit that moves the buffer body up or down relative to the frame such that a respective buffer layer having thereon a substrate to be transferred is connected to the driving unit, wherein the driving unit moves backwards away from the buffer body via the movable rail to facilitate vertical movement of the buffer body; and a time sensor for sensing time for which a substrate stays on a buffer layer, wherein the driving unit rotates the shafts of a buffer layer connected thereto to transfer the substrate.