Patent ID: 7614728

Claim:
A printing machine cartridge ( 1 ) for feeding ink to an ink duct of a printing machine comprising, for containing ink, a hollow casing ( 2 ) presenting a base ( 4 ) provided with an ink dispensing valve ( 4 a ) and a piston ( 5 ) slidable within said hollow casing ( 2 ) to cause the ink to be dispensed by said dispensing valve ( 4 a ), characterised in that said piston ( 5 ) presents a non-return valve ( 7 ) for feeding ink into said hollow casing ( 2 ), to enable the cartridge to be recharged, a chamber ( 6 ) defined between said hollow casing ( 2 ) and said base ( 4 ) and said piston ( 5 ), said ink being contained only in said chamber ( 6 ), and characterised by presenting second stiffening ribs ( 20 ) disposed on the periphery of said projecting annular edge ( 13 ) of said piston ( 5 ).