Abstract: A device for perforating material webs by perforating tools accommodated on perforating cylinders and capable of producing perforations on copies in an exactly correct position with respect to cross-folds formed in the copies, the perforation position being adjustable during machine operation, the perforating tools being cooperatively related with associated perforating strips for producing transverse or cross-perforations, includes at least one perforating bar disposed coaxially with at least one of the perforating cylinders, the perforating tools and the perforating strips being accommodated on at least one of the perforating bars, the at least one of the perforating cylinders being adjustable relative to at least another of the perforating cylinders; a folder including the perforating device; and a pin-less folder including the perforating device.

Abstract: A folder having at least one folding unit with at least two mutually cooperating product-carrying cylinders, the folder having further folding attachments, and devices for increasing cutting accuracy, includes retaining elements engageable with at least one material web for retaining the web, and a rotating support surface assigned to one of the product-carrying cylinders within a transfer region, the rotating support surface serving to support the web when it is engaged by the retaining elements.

Abstract: Device for adjusting printing-unit cylinders in a printing unit of a rotary printing press for printing on both sides of a material web, the printing-unit cylinders including printing-form cylinders with exchangeable printing forms, one of the printing-unit cylinders being held stationary in the printing unit, includes an auxiliary adjusting unit for maintaining a gap traversible by the material web, the gap being formed between outer cylindrical surfaces of two of the printing-unit cylinders disposed adjacent to a path of the material web through the printing unit, the gap being maintainable by the auxiliary adjusting unit independently of adjusted positions of others of the printing-unit cylinders.