Abstract: A modular-head endorser includes a plurality of mateable modules which form an ink jet printer. These modules cooperate to expel drops of printing fluid, direct them to a printing surface, and recirculate excess drops to a fluid supply. Some of the modules are joined together without tools so the user of the invention can quickly and easily clean, replace, and assemble certain modules without additional assistance.

Abstract: A continuous deaeration system for a fluid pump system includes a housing having an inlet port through which aerated fluid flows into the housing from a pump, an outlet port through which aerated fluid flows for recirculation in the fluid system, and a deaerated fluid outlet port through which virtually contaminant and air-free fluid flows to an ink jet printer apparatus. The housing encloses a filter element with appropriately sized interstices which continuously separates air and fluid contaminants from the flow of aerated fluid received from the inlet port of the housing. A reservoir, also within the housing, collects the contaminant free deaerated fluid and air separated from the deaerated fluid. The air-fluid mixture is transmitted to the outlet port of the housing while the virtually contaminant free deaerated fluid exits the housing through the deaerated fluid outlet port.

Abstract: A fluid pump system for an ink jet printer apparatus includes a reservoir of printing fluid, a filter for removing contaminants from the printing fluid, and an apparatus for printing characters with the printing fluid. A gear pump delivering steady, stable fluid pressure pumps the virtually contaminant free printing fluid to the printing apparatus. The gear pump also circulates to the reservoir an amount of printing fluid in excess of the amount required by the printing apparatus. A device regulates when the virtually contaminant free printing fluid is supplied to the means for printing and an additional device supplies virtually contaminant and air-free printing fluid to the means for printing.

Abstract: A fluid coupling system employs a cap assembly and a connector assembly to provide a leakproof fluid coupling between a liquid container and a device requiring liquid. The cap assembly consists of a cap, a filler valve assembly, a spring and a cap gasket. The connector assembly includes a pusher stem and a cap guide which operate to provide a sealed fluid passageway thereby preventing any fluid leakage. A tank bay is also utilized to contain any accidental fluid leakage.