Nozzle cleaning device for an ink jet printer

A nozzle cleaning device for an ink jet printer having a plurality of ink reservoirs, the cleaning device comprising a pressure source and a valve mechanism (22) for selectively coupling the pressure source to the ink reservoirs, characterized in that the valve mechanism comprises a valve housing (26) having a wall with a plurality of outlet ports (48), each of which is connected to one of the ink reservoirs, and a piston (28) movable in the valve housing and defining therewith a first pressure chamber (46) and having an inlet port (60) connected to the pressure source through a connector (52) and surrounded by a seal (54) which defines, together with said wall of the valve housing (26), a second pressure chamber (56) adapted to be brought into communication with a selected one of the outlet ports (48) through movement of the piston (28).