Patent ID: 6550384
Filing Date: 2003-04-22
Classification: B65H

Abstract:
A method for web width correction between an upstream printing nip and a downstream printing nip of a rotary printing machine, the method comprising:printing the web in sequence in the upstream printing nip and in the downstream printing nip; imposing a wave-like profile on the web transversely to the running direction of the web between the printing nips with a rotatively mounted rotational body configuration with the web permanently partially winding around the rotational body configuration with a wrap angle of at least 3Â°, wherein said rotational body configuration comprises in an axial direction alternatingly protruding and retracting shell portions in sequence relative to the web and a change in the web length between the upstream printing nip and the downstream printing nip is prevented by radial movement of the protruding shell portions and of the retracting shell portions being mirror-symmetrical relative to a longitudinal axis of the rotational body configuration.