Tandem type of direct printing apparatus using gating apertures for supplying toner

摘要

A tandem type direct printing apparatus 2 comprising a plurality of printing stations 16a, 16b, 16c and 16d for depositing printing particles 38 on a print medium 8 to form a layer of printing particles. The plurality of printing stations 16a, 16b, 16c and 16d are positioned in a moving direction of the print medium 8. The printing station positioned downstream with respect to the moving direction of the print medium forms a layer of printing particles on the layer of printing particles formed by the printing station positioned upstream. At least any one of the printing stations 16a, 16b, 16c and 16d is different in intention of the electric field from another by changing the voltage applied to the backing electrode 44 or the distance between the backing electrode 44 and the printing head 50 in accordance with a charge quantity of printing particles or the number of the layer of printing particles in the one of the printing stations.