* three colour on one side of the web * 3 colour unit comprise of three printing couples surrounding a common impression cylinder which facilitates three colour printing on one side of the web. * high quality of 4 colour printing on one side of the web and one colour on the other can be printed when a stacked blanket to blanket unit is mounted on this colour unit * colour unit is equipped with continuous feed inking system with an oscillation drum between first and second form rollers to ensure even and smooth coverage of ink.