System of buffer storage and sequencing of items comprising two elevators

System of buffer storage and load sequencing, configured to receive non-sequenced loads coming from at least one external unit through at least one entering forward conveyor (CAE, CAE′), and to provide sequenced loads to at least one preparing station (PP, PP′) through at least one exiting forward conveyor (CAS, CAS′), said system being characterized in that it comprises:

• a buffer storage unit (US) comprising N entrance levels (VE1 to VEN) disposed vertically, each of the N entrance levels comprising a “first-in first-out” type conveyor in a first direction and having a single entrance and a single exit, with N≥2;
• an entering reciprocating elevator (EAE) and an exiting reciprocating elevator (EAS) of a discontinuous type, positioned respectively so as to be facing the single entrances and facing the single exits of the N entrance levels;
• and
• a management unit (UP) configured to organize, under a constraint of delivering on said at least one exiting forward conveyor at least one sequence comprising loads in a desired sequential order:
• first movements of loads from said at least one entering forward conveyor towards the entering reciprocating elevator, second movements of loads from the entering reciprocating elevator to the single entrances of the N entrance levels of the buffer storage unit, third movements of loads from the single exits of the N entrance levels of the buffer storage unit towards the exiting reciprocating elevator, and fourth movements of loads from the exiting reciprocating elevator to said at least one exiting forward conveyor.