A production line comprises one or more assembling stations and at least one module for carrying containers for supplying to the assembling stations parts which are necessary during the execution of a working cycle. In one example, the module includes a paternoster conveying system including a plurality of drawings for containing the parts. The module includes two endless lateral chains and two lateral guide rails engaged with each drawer. The paternoster system and guide rails selectively position the drawers to downwardly angularly rotate toward the workstation when facing the workstation to increase ergonomic access to the parts for the assembling station operator.