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US 4,596,546 AGranted
Process and apparatus for perforating, stamping or creasing of paper and cardboard in rotary printing presses
OwnerRolf Schellenberginventor
Life of this patent
Estimating the term…
Abstract
In a rotary printing press with a blanket cylinder (2) and an impression cylinder (3), the blanket is removed and replaced by a base sheet (5). On this base sheet (5) are arranged strips (6). The arrangement of the strips (6) corresponds to the perforation, stamping or creasing to be produced in the paper or cardboard passing through the rotary printing press. On the impression cylinder (3) is arranged a smooth protective sheet (7). Both sheets (5) and (7) can be used several times and can be installed or removed rapidly by means present on the machine.
Claims6
A cutting method comprising the steps of:
- converting into a cutter a rotary printing press having an impression cylinder and a blanket cylinder having a rubber blanket thereon, both of which cylinders are journalled at their opposite ends in respective bearings supported in a frame, said converting step including
- removing the rubber blanket from the blanket cylinder,
- providing a thin flexible sheet having first and second ends,
- securing at least one cutting, perforating or grooving strip in a desired position on the sheet,
- after securing the strip on the sheet, placing the sheet on the blanket cylinder by attaching the first end of the sheet to the blanket cylinder, rotating the blanket cylinder in its bearings to draw the sheet onto the blanket cylinder, and securing the second end of the sheet to the blanket cylinder,
- adjusting the distance between the blanket cylinder and the impression cylinder, and
- conducting a sheet of material between the blanket cylinder and the impression cylinder to effect cutting, perforating or grooving of the sheet of material by said cutter.
4 more elements
Dependencies are inferred from the claim text.