| US 7,467,861 B2 | ||
| Ink refill unit with incremental ink ejection for a print cartridge | ||
| Kia Silverbrook, Balmain (Australia); Akira Nakazawa, Balmain (Australia); Christopher Hibbard, Balmain (Australia); Paul Ian Mackey, Balmain (Australia); Norman Micheal Berry, Balmain (Australia); and Garry Raymond Jackson, Balmain (Australia) | ||
| Assigned to Silverbrook Research Pty Ltd, Balmain, New South Wales (Australia) | ||
| Filed on Nov. 25, 2007, as Appl. No. 11/944,633. | ||
| Application 11/944633 is a continuation of application No. 11/014751, filed on Dec. 20, 2004, granted, now 7,303,268. | ||
| Application 11/014751 is a continuation in part of application No. 10/760254, filed on Jan. 21, 2004. | ||
| Prior Publication US 2008/0068427 A1, Mar. 20, 2008 | ||
| Int. Cl. B41J 2/175 (2006.01) | ||
| U.S. Cl. 347—85 [347/86] | 4 Claims |
| 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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