| Patent application number | Description | Published |
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| 20090219324 | PRINTER HAVING RECYCLING INK AND PRESSURE-EQUALIZED UPSTREAM AND DOWNSTREAM INK LINES - A printer comprising a printhead and a pressure-regulating chamber containing ink at a predetermined first level relative to the printhead. The chamber comprises an outlet port, a return port positioned in a base of the chamber, a snorkel extending from the return port and terminating at a snorkel outlet positioned above the first level of ink, and an air vent open to atmosphere. An upstream ink line interconnects the outlet port and an ink inlet of the printhead. A downstream ink line interconnects the return port and an ink outlet of the printhead. The downstream ink line has a section looping below the first level of ink. In a printing configuration, a second level of ink in the snorkel is equal to the first level of ink in the chamber. | 09-03-2009 |
| 20090219325 | PRESSURE-REGULATING CHAMBER FOR GRAVITY CONTROL OF HYDROSTATIC INK PRESSURE AND RECYCLING INK SUPPLY SYSTEM - A pressure-regulating chamber for maintaining ink contained in the chamber at a predetermined first level relative to a printhead. The chamber comprises: an inlet port for connection to an ink reservoir via an ink supply line; an outlet port for connection to an ink inlet of the printhead via an upstream ink line; a return port for connection to an ink outlet of the printhead via a downstream ink line; a snorkel extending from the return port and terminating at a snorkel outlet positioned above the first level of ink; an air vent open to atmosphere; and a float valve for maintaining the predetermined first level of ink by controlling a flow of ink into the inlet port. | 09-03-2009 |
| 20090219326 | PRESSURE-REGULATING CHAMBER COMPRISING FLOAT VALVE BIASED TOWARDS CLOSURE BY INLET INK PRESSURE - A pressure-regulating chamber for maintaining ink contained in the chamber at a predetermined first level relative to a printhead. The chamber comprises: an inlet port for connection to an ink reservoir via an ink supply line; an outlet port for connection to an ink inlet of a printhead via an upstream ink line; an air vent open to atmosphere; and a float valve for maintaining the predetermined first level of ink by controlling a flow of ink into the inlet port. The float valve is biased towards a closed position by a positive ink pressure at the inlet port. | 09-03-2009 |
| 20090219331 | METHOD OF PRIMING A PRINTHEAD WITH CONCOMITANT REPLENISHMENT OF INK IN AN INK SUPPLY CHAMBER - A method of priming a printhead. The method comprises the steps of: (i) providing a printhead having a plurality of nozzles for ejection of ink, an ink inlet and an ink outlet; (ii) providing an ink chamber having an outlet port connected to the ink inlet via an upstream ink line, the ink chamber having an inlet port controlled by a valve; (iii) priming the printhead by pumping ink from the ink chamber, through the printhead and into a downstream ink line connected to the ink outlet; and (iv) opening the valve if a level of ink in the chamber falls below a predetermined first level and replenishing with ink from an ink reservoir when the valve is open. | 09-03-2009 |
| 20090219332 | METHOD OF DEPRIMING A PRINTHEAD WITH CONCOMITANT ISOLATION OF INK SUPPLY CHAMBER - A method of depriming a printhead. The method comprises the steps of: (i) providing a printhead having a plurality of nozzles for ejection of ink, an ink inlet and an ink outlet; (ii) providing an ink chamber having an outlet port connected to the ink inlet via an upstream ink line, the ink chamber having an inlet port controlled by a valve; (iii) depriming the printhead by pumping ink from a downstream ink line connected to the ink outlet, through the printhead and into the ink chamber; and (iv) closing the valve when a level of ink in the chamber reaches a predetermined first level, thereby isolating the ink chamber from an ink reservoir in fluid communication with the inlet port. | 09-03-2009 |
| 20090219368 | PRINTER WITH INK LINE DAMPENING OF INK PRESSURE SURGES - A printer comprising: a printhead having an ink inlet and an ink outlet; an ink chamber for supplying ink to the printhead; an upstream ink line interconnecting an outlet port of the ink chamber and the ink inlet; a downstream ink line connected to the ink outlet; and a first air accumulator communicating with the downstream ink line. The first air accumulator is configured for dampening ink pressure pulses in the printhead during printing. | 09-03-2009 |
| 20110102521 | INK SUPPLY SYSTEM WITH FLOAT VALVE - An ink supply system for an inkjet printer. The ink supply system includes an ink reservoir and a pressure-regulating chamber. The pressure-regulating chamber has an inlet port, an outlet port, an air vent open to atmosphere and a float valve for maintaining a predetermined level of ink in the chamber. The float valve is biased towards a closed position by a positive ink pressure from the ink reservoir at the inlet port. | 05-05-2011 |
| 20110228018 | INKJET PRINTER WITH FLOAT VALVE REGULATION OF HYDROSTATIC INK PRESSURE - An inkjet printer includes: an inkjet printhead; an ink reservoir containing a supply of ink; and a pressure-regulating chamber for maintaining ink contained therein at a predetermined first level. The chamber includes: an inlet port connected to the ink reservoir via an ink supply line; an outlet port connected to an ink inlet of the printhead via an upstream ink line; an air vent open to atmosphere; and a float valve for maintaining the predetermined first level of ink. The float valve includes: an arm pivotally mounted about a pivot; a float mounted at one end of the arm; and a valve stem attached to the arm, said valve stem having a valve head for closure of a valve seat, the valve seat being positioned at the inlet port of the pressure-regulating chamber. | 09-22-2011 |
