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Ink refill unit with incremental ink ejection for a print cartridge

  • US 7,467,861 B2
  • Filed: 11/25/2007
  • Issued: 12/23/2008
  • 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 piston and cylinder arrangement with the piston biased into the cylinder with a compressed spring, said ejector assembly having a pawl-and-ratchet detent preventing the biased piston entering the cylinder until the pawl is actuated by the print cartridge.

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