Abstract-In printing systems, the positioning accuracy of the medium with respect to the print heads directly impacts print quality. In a regular document inkjet printer, the main task of the media positioning drive is to shift the medium after the printhead has finished a pass. Most media have the tendency to deform while it is being printed due to variations in temperature and moisture content. In order to improve print quality, we propose to move the medium during printing to counteract the deformation. These small scale trajectories are performed in an operating regime of which the dynamics considerably differ from the regular transportation step. Using iterative learning control with basis functions for both positioning tasks, the positioning accuracy of the drive is improved substantially; while keeping numerical cost low.
In this paper, a new Parameterized Iterative Learning Controller (PILC) is discussed. A fixed structure feedforward controller is put into a setting for iterative learning control and adapted to work in a repetitive environment. The fixed structure keeps the number of inline calculations low and enables proper adjustment to changing tasks. Within the ILC setting, suitable compensations can be found in a variable environment and specific penalties can be given to errors in trial domain. Further, by taking into account possible interaction between the trials, the PILC works properly with changing initial conditions over the trials. Successful implementation of the PILC on the carriage of a professional wide format inkjet printer shows its practical applicability.
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