Folder for adjustably tensioning a web and method of adjusting web tension as a web is cut

摘要

A printing press folder is provided. The printing press folder includes a cutting apparatus cutting a moving web to form successive signatures, a first acceleration cylinder and a second acceleration cylinder. The first acceleration cylinder includes a first contacting segment and a first relieved portion circumferentially adjacent to the first contacting segment and the first contacting segment radially protrudes from the first acceleration cylinder with respect to the first relieved portion. The second acceleration cylinder includes a second contacting segment and a second relieved portion circumferentially adjacent to the second contacting segment and the second contacting segment radially protrudes from the second acceleration cylinder with respect to the second relieved portion. The first acceleration cylinder and the second acceleration cylinder grip the web at a gripping location with the first contacting segment and the second contacting segment to create a tension in the web as the web is cut by the cutting apparatus. A method of varying tension in a web in a printing press folder is also provided.