Abstract: A stack of signatures is transformed into a moving stream of individually arranged signatures by feeding a stack of signatures on edge to a transfer station, individually transporting the signatures as a moving stream away from an entrance location laterally offset from the stack, and carrying each signature of the stack in turn laterally to the entrance location as such signature arrives at the transfer station. As each signature is carried laterally to the entrance location, such signature is separated from the stack so as to prevent mutilation due to friction with the adjacent signature on the stack. The signatures are carried to the entrance location by suction cups that form part of a transfer arm. The transfer arm is momentarily transported away from the stack as it carries the signature to the entrance location so as to effect separating of the signature from the stack.