Abstract: Embodiments described herein include an upstream measurement module, a curler downstream of the upstream measurement module, and a print station downstream of the curler. The upstream measurement module includes a transport on which media is tacked to flatten the media and a curl sensor to generate a curl signal corresponding to a media curl of the media on the transport. The curler curls the media in response to the curl signal to reduce a magnitude of the media curl. The print station includes a marking unit to dispose a marking material on the media and a transport to transport the media past the marking unit, wherein the first and second transports apply a substantially equivalent hold down force to the media.

Abstract: A large format printer using web fed material is able to cope with roll fed material and sheets having residual curl. An anti-curl guidance device counteracts curl when feeding the medium to a second transport system. The medium is held flat by a vacuum system and during re-feeding of the medium, the height of the position of the medium exhibiting residual curl is adjusted by a moving pivot roller to smoothly pass over a cutting bar. Also, the entrance of a re-feeding chamber is enlarged by lifting a retractor pivot plate by a retractor pivot to allow curled media to enter the re-feeding chamber. Curl can also be avoided by keeping the web roll of media in a relatively humid condition by restricting air flow or by using an extra humidifier.