Ink recirculating device of ink jet printer

An ink jet system printer comprising:

• a carriage means carrying a nozzle for discharging ink droplets toward a recording medium in response to an ink supply device, and deflection means for selectively deflecting the ink droplets for recording purposes;
• a beam gutter means carried on the carriage means for collecting the ink droplets which are not contributive to the recording purposes;
• a pump means including a piston mounted within a housing having a plurality of diaphragms disposed along the length thereof, said diaphragms being at least three in number and forming at least three pressure chambers therebetween for drawing in or forcing out ink;
• and
• a first pressure chamber operatively connected to the beam gutter means to receive ink therefrom and selectively forces the collected ink back to an ink supply reservoir, the second and third pressure chambers being in communication with the ink supply reservoir for supplying ink to said nozzle at a constant flow rate, said at least three pressure chambers of said pump means being coaxial cylindrical chambers and being operatively connected to a single drive member.