What printing device did Leonardo da Vinci design to keep type and paper aligned?

Leonardo da Vinci designed a printing-press improvement to keep type and paper aligned.

Leonardo’s printing studies explored ways to make printing more efficient and accurate. His concepts included mechanical arrangements for controlling the movement of the forme, the inked type, and the sheet of paper. Better alignment could reduce wasted material and improve the consistency of printed pages.

The basic printing press already existed before Leonardo. Johannes Gutenberg’s mid-fifteenth-century press had transformed European book production by combining movable metal type, oil-based ink, and a screw press. Leonardo was therefore proposing refinements to an established technology, not inventing movable type from nothing.

Leonardo’s printing-related sketches are often grouped with his mechanical and engineering designs. They show his interest in automating repetitive work. Because the surviving drawings are conceptual and incomplete, historians distinguish between Leonardo’s proposed press improvements and presses that were actually manufactured in his workshop.