Importance

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Abstract

An apparatus for imprinting a sheet web includes two cylinders that rotate with a circumferential speed that corresponds to the speed of the web and which support the web over a specified angle region. Contactless printing heads are arranged side by side and at a distance to the circumferential surface of the associated cylinder and positioned transverse to the rotational direction of the associated cylinder. The printing heads each have a face oriented tangential to the associated cylinder and a center line that is essentially radial to the circumferential surface of the associated cylinder. A guiding device includes first and second guide devices associated with the respective cylinders to guide the web. Each guide device includes at least one pressure roller that fits against the surface of the associated cylinder and an element arranged to pull the web tangentially from the circumferential surface of the associated cylinder along a tangential path section. The guiding device further guides the web so that when the web rests on one cylinder, one side of the web may be imprinted and when the web rests on the other cylinder, the other side of the web may be imprinted. A tension device generates a desired web tension in the web. At least two quality measuring devices each associated with a respective one of the cylinders determine a quality of the web after the web leaves the associated cylinder at a location along the tangential web section.

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First Claim