a vending arrangement for computerized vending machines , retail displays , automated retail stores , utilizes a centralized , robotic gantry associated with companion modules for vending selectable products . the modularized design enables deployment of half - sized or full - sized machines . the robotic gantry is deployed in a centralized module disposed adjacent display and inventory modules . the inventory modules can be fitted to both gantry sides , and doors can be fitted to the gantry front or rear . the gantry comprises an internal , vertically displaceable elevator utilizing a central conveyor for laterally , horizontally moving selected items from associated display and inventory positions to a vending position . the inventory modules comprise dispensing modules adjustably configurable to adjust the storage density of items to be vended . computerized software enables the display and vending functions , and controls movement of the gantry elevator and dispenser module conveyor to dispense products from twin sides of the gantry by controlling the gantry conveyor .