Multi-Level Belt Accumulator is the most suitable LM accumulation model for storing a large number of product rows (based on the length of the buffer and number of levels). This consists in a series of conveyor belts stacked one above the other, powered by a multi-position tilting belt at the infeed and unloaded by another outfeed tilting belt. The movement of the tilting belts is controlled by servomotors and the vertical stroke is extremely reduced, making it possible to change level between one row of products and the next, quickly and frequently. The buffer management program of the stacked belt accumulator is optimised so as to adapt dynamically to the variations in speed of the line by unloading downstream the quantity of products that the packaging zone is able to absorb, regardless of how many products arrive from the process. The conveyor belts have all of the features of LM belt conveyors, such as small diameter knife edges, automatic centring systems, easy belt tensioning, sturdiness and reliability.