Abstract: A continuous signature stacker machine is provided with a transversely operating assembled package ejecting device. The stacker includes a platform onto which individual signatures are sequentially fed on edge to form a stack of predetermined length and a slide member against which the formed stack is pushed. The slide member is moved by a pair of chains slowly in one direction as a stack is formed and rapidly in the opposite direction to a position for forming a new stack after the formed stack is removed. The formed stack is manually or automatically pressed and strapped.