Modern printing presses are generally made up of plates, Shime, imprinting, paper conveying (including folding) and other bodies. Its working principle is: First will print the text and image into a printing plate, installed on the printing press, and then by artificial or printing ink on the printing plate with text and images, and then directly or indirectly transferred to paper or other substrates (such as textiles, metal plate, plastic, leather, wood, glass and ceramic) on the Thus copying the same print as the printing plate. The invention and development of printing presses play an important role in the dissemination of human civilization and culture.