Printing with a limitation of layer thickness and of tonal-value increase

摘要

Control system for inking a printing press wherein a sheet printed by the printing press is measured photoelectrically in a plurality of test areas and thus-obtained measured values are processed in conjunction with setpoint values to form control data, based upon which the inking of the printing press is controlled, which comprises computing a tonal-valve increase at an actual locus and at a setpoint locus from at least one measured value of a half-tone field and of a full- tone field of a printed sheet; if the tonal-value increase at the setpoint locus is not a tolerable tonal-value increase, determining corresponding tolerance limits of ink layer thickness for a maximum and a minimum tolerable tonal- value increase; with the ink layer thickness, computing a possible locus at the limit of the tolerable tonal-value increase as a new setpoint locus, and triggering the setpoint locus, if it is additionally within a color tolerance and density tolerance, respectively.