Abstract: Apparatus for feeding rectangular blanks of corrugated paper board from a stack thereof comprising means for delivering the blanks onto a first conveyor belt in such a manner that the blanks extend transversely of the belt with one edge only engaging the belt and extending outwardly therefrom to overlie a further conveyor belt transversely spaced from and parallel with said first conveyor belt and arranged at a lower level and which runs in the same direction but at a higher speed than the first conveyor belt, whereby an operator can pivot selected groups of blanks being fed by said first conveyor belt from engagement therewith and into engagement with said further conveyor belt, whereby thus selected groups are caused to fall backwardly and thus inverted relative to remaining groups which are allowed to fall forwardly when in engagement with the first conveyor belt.