PRINTING MACHINE HAVING DUCTOR ROLLER, CORRECTION DEVICE, AND PRINTING MACHINE CORRECTION METHOD

In the present invention, when an individual graph data set is denoted by gr, an initial value thereof is denoted by gri, an average of graph data sets in the whole of a ductor roller is denoted by g, and an initial value thereof is denoted by gi, graph data sets gr and g are corrected during printing so as to eliminate errors between a printing density and a target density. When a stabilization value of the average graph data set g is denoted by ge, and a stabilization value of the individual graph data set gr is denoted by gre, data sets including the initial values gi, gri and the stabilization values ge, gre are collected. A base parameter B is increased or decreased on the basis of the difference, in the collected data sets, between the distribution of the stabilization value ge and the distribution of the initial value gi. The collected data sets are divided on the basis of each printing speed, and, with respect to a speed parameter V, a speed parameter V for each division is increased or decreased, on the basis of the difference, in each division of the graph data set g, between the distribution of the stabilization value ge and the distribution of the initial value gi. The collected data sets are divided on the basis of the average graph data set g, and an area parameter F for each g division is increased or decreased on the basis of the difference, in each g division, between the distribution of the stabilization value ge and the distribution of the initial value gi. A roller parameter R of a corresponding individual roller is increased or decreased on the basis of the difference, in the individual graph data set, between the distribution of the stabilization value gre and the distribution of the initial value gri. The duty ratio of the ductor roller is corrected on the basis of each parameter value. Dans la présente invention, lorsqu'un ensemble de données de graphe individuel est désigné par gr, une valeur initiale de ce dernier est désignée par gri, une moyenne des ensembles de données de graphe dans l'ensemble d'un rouleau preneur est désignée par g, et une valeur initiale de cette dernière est désignée par gi, les ensembles de données de graphe gr et g sont corrigés pendant l'impression de manière à éliminer les erreurs entre une densité d'impression et une densité cible. Lorsqu'une valeur de stabilisation de l'ensemble de données de graphe moyen g est désignée par ge, et une valeur de stabilisation de l'ensemble de données de graphe individu