Abstract: A method of printing and stacking sheets improves the relative alignment of images in a stack of printed sheet. The method includes feeding a sheet at least twice past a printhead assembly for printing an image on both sides of the sheet, wherein in the first and second passes the respective front and back images are aligned with respect to a first edge of the sheet by detecting a skew angle between the first and second edges and applying the skew angle to align the front and back images; and stacking the sheet, wherein the sheet is registered to a predetermined stacking reference direction by one of its edges, and wherein during the stacking, the sheet is registered by its first edge.

Abstract: The present invention provides a guide device for guiding print medium onto a take-up roll in a printing system. The guide device comprises a first guide member presenting a substantially planar surface for limiting or preventing lateral deviation of a printed medium output from the printing system as the medium moves along a transport path towards a take-up roll for winding or taking up a length of the medium. The first guide member is stationary in use. A position of the first guide member is adjustable in a direction transverse to the transport path for setting the position to limit or prevent lateral deviation of the medium along the transport path. The guide device further comprises a second guide member presenting a support surface configured and arranged to support the medium thereon as the medium travels along the transport path towards the take-up roll. The first guide member and the second guide member are preferably integrally formed as a guide unit.

Abstract: The present invention provides apparatus for assisting change-over of take-up rolls in a printing system, especially in a roll-to-roll printing system. The apparatus comprises a guide device for directing or guiding printed sheet output from the printing system along a transport path towards a take-up roll for winding or taking up a length of the printed sheet, and a first clamping device for holding a new leading edge region of the printed sheet formed after the printed sheet is cut to terminate the length of the sheet to be wound or taken up onto the take-up roll. The first clamping device is configured to hold or clamp the new leading edge region of the printed sheet against movement along the transport path towards the take-up roll.

Abstract: An inkjet printer assembly for printing an image on a recording medium comprises a medium support surface for supporting a recording medium; an inkjet print head for ejecting droplets of an UV-curable ink on the recording medium, the inkjet print head being arranged over the medium support surface; an UV radiation source for irradiating the droplets of UV-curable ink on the recording medium, the UV radiation source being arranged over the medium support surface; a covering arranged over the medium support surface, the covering and the medium support surface together enclosing a print space including the inkjet print head and the UV radiation source; and exhaust means, the exhaust means being configured to vent the print space.

Abstract: In order to enable simple and easy handling of a large number of large format sheets, an output assembly is provided. The output assembly comprises a lower output tray element for receiving the sheets. In order to reliably transport and deposit a large format sheet from the printing device onto the lower output tray element, a guide element is provided just below an output opening of the printing device such to guide a leading edge of the sheet onto the lower output tray element. Once the leading edge is supported by the lower output tray element, the guide element is retracted such to enable a trailing edge to be deposited on the lower output tray element.

Abstract: The invention relates to a method for full bleed printing using an inkjet printing apparatus. In the method for full bleed printing, a reference pattern is applied on the receiving medium in a current swath. The carriage of the inkjet printing apparatus and the receiving medium are moved with respect to one another in the sub scanning direction and in a subsequent swath, the distance between the reference pattern and a side edge of the receiving medium is determined, and based on the determined distance between the reference pattern and the side edge of the receiving medium, dots to be printed in an area between the side edge of the receiving medium and the reference pattern are determined.