HEIDELBERG , GERMANY—  Heidelberger introduces Stahlfolder P-Stacker. The robot technology takes over the signature stacks at the output of the folding machines and places them on pallets fully automatically.  Customers can now produce  using the Push to Stop technology of the P-Stacker . Heidelberg was the first manufacturer in the world to introduce the Push to Stop principle to Speedmaster sheetfed offset printing technology and apply it to Stahlfolder folding machines. Depending on whether postpress is carried out on a saddlestitcher or adhesive binder, the signatures must be stacked with the first page either facing up or facing down. While this task was previously left to the operator of the folding system, it can now be carried out by the P-Stacker, with its robot arm gripping the packages in the alignment unit either from the front or from the back. Likewise, the P-Stacker can also insert intermediate layers automatically.