Abstract: An alignment system for the positioning of printing plates on offset printing presses which have an axially extending fastening channel. The system includes of a stamping machine for the punching out of register holes in the printing plate and the related plate masks, a pre-mount table, a bending device for the printing plate and a blocking piece in the fastening channel.

Abstract: A bending fixture for offset plates provided with positioning holes, the bending fixture including a platform having bending bars pivotally mounted at opposite ends thereof and plate hold-down members coacting therewith, where the hold-down members are raised away from and lowered toward the platform during their operation. The bending bars swing upward above the platform with one of the bars being provided with retractable positioning pins arranged along the one bar. Each hold-down member includes an edge surface to provide an abutment for the bent over edge of the plate in order to back up its associated bending bar.