To provide a printer having a constitution capable of preventing a color mixture via a transfer drum or particularly a transfer of an ink into a developing unit in the printer having the drum.

The printer 1 comprises at least an intermediately transferring unit 24 having a transfer capable of superposition transferring the ink supplied onto a plate on a plate drum 1-0, a simultaneously transferring unit 25 for simultaneously transferring the ink transferred to the transfer to a printing sheet, and a printing sheet supply unit 27 for supplying the sheet to the unit 25. The printer 1 also comprises an ink removing means 32 provided at a position corresponding immediately after transferring the image from the unit 24 to remove the ink layer retained on a plate drum 1-0 in a plate drum unit 1 in which the ink image is transferred from the unit 24.