Pressure regulated free-ink ink-jet pen
August 24, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesControl valve for ink jet nozzles Ink printer equipped with an ink printing head and intermediate ink container disposed on a movable carriage Coupling for the leakage-free connection of fluid-filled pipes and containers Ink reservoir with essentially constant negative back pressure Ink jet printhead having a preloaded check valve Ink supply system for use in an ink-jet printer Off board ink supply system and process for operating an ink jet printer Ink reservoir of ink jet printer Out-of-ink sensing method Ink remain detector having a flexible member and a liquid injection recording apparatus utilizing the detector InventorAssigneeApplicationNo. 518847 filed on 08/24/1995US Classes:347/7, Fluid content (e.g., moisture or solvent content, ink refilling, liquid level)347/85Fluid supply systemExaminersPrimary: Metjahic, SafetAssistant: Chizmar, John Foreign Patent References
International ClassB41J 002/195AbstractThe present invention relates to free-ink type ink-jet pens. A spring-loaded regulator mechanism is provided within the pen to allow ink from a pressurized ink reservoir to be fed to the pen while maintaining a predetermined set point back-pressure at the printhead as needed for appropriate pen operation. A mechanism in communication with the ambient atmosphere is used in conjunction with a substantially constant force biasing mechanism to maintain the balance between the countervailing forces. Back-pressure is maintained substantially constant regardless of the ink flow rate from the ink reservoir into the pen. | |
