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Ink refill unit with threaded incremental ink ejection for print cartridge

  • US 7,699,448 B2
  • Filed: 07/22/2008
  • Issued: 04/20/2010
  • Est. Priority Date: 01/21/2004
  • Status: Expired due to Fees
First Claim
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1. An ink refill unit for a print cartridge, said unit comprising:

  • a housing defining a fluid path in fluid communication with an outlet and configured to be operatively engaged with the print cartridge;

    a fluid reservoir having an ejection port arranged in fluid communication with the fluid path inside the housing; and

    an ejector assembly configured to incrementally eject fluid from the reservoir when the assembly is actuated by operative engagement of the print cartridge with the housing,wherein the ejector assembly includes a plunger having a toothed thread which engages with a screw thread provided in an internal wall of the housing, the ejector having a drive gear so that actuation of the drive gear imparts rotation to the toothed thread so as to rotate the plunger within the screw thread of the housing to eject ink from a bellows-like reservoir.

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