Automatic line for pad printing of plastic crates 1 color on 4 sides, equipped with device for rotation of the crates and opportunity to print on 4 sides or on 2 opposite sides. Automatic loading of the crates from the injection press, post printing stacking station, measures identification device with discard of the pieces do not fit. Hermetic inkcup with ceramic ring diameter 160 mm, automatic and programmable pads cleaning. Adaptable to different sized crates. Output about 400 pieces/hour.