Abstract: A combination weigher including a dispersion unit adapted to radially disperse product material dropped in from above onto the dispersion unit, plurality of weighing hoppers, plurality of conveyor units arranged around and below a periphery of the dispersion unit. The conveyor units include troughs having infeed ends positioned below the dispersion units and outfeed ends positioned above the weighing hoppers, and spiral shaped members extending from the infeed ends towards the outfeed ends. Spiral shaped members being operable connected to an operation unit for operating a rotational movement of the spiral shaped members conveying the product material from the infeed ends towards the outfeed ends into the weighing hoppers. Conical shaped members are arranged within the spiral shaped members.