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1. (WO2001002181) SEAL IN MICRO ELECTRO-MECHANICAL INK EJECTION NOZZLE

Pub. No.:    WO/2001/002181    International Application No.:    PCT/AU2000/000587
Publication Date: Fri Jan 12 00:59:59 CET 2001 International Filing Date: Thu May 25 01:59:59 CEST 2000
IPC: B41J 2/14
Applicants: SILVERBROOK RESEARCH PTY LTD
SILVERBROOK, Kia
Inventors: SILVERBROOK, Kia
Title: SEAL IN MICRO ELECTRO-MECHANICAL INK EJECTION NOZZLE
Abstract:
A micro electro-mechanical device embodied within an ink ejection nozzle having an actuating arm (28) that is caused to move an ink displacing paddle (27) when heat inducing electric current is passed through the actuating arm (28) is disclosed. The paddle (27) is located in an ink chamber (24) and the actuating arm (28) passes through an actuator aperture (54) in the chamber (24). The chamber (24) is partly defined by a cylindrical part circular concave edge portion (10) on an upper wall (23) of the ink chamber (24). The actuating arm (28) carries a second cylindrical wall (9) which covers the actuator aperture (54) and which registers in the part circular concave edge portion (10). The second circular wall (9) is moveable relative to the edge portion (10) when the actuating arm (28) and paddle (27) are moved to eject a droplet (D). Upon movement of the actuating arm (28) the second wall (9) moves relative to the edge portion (10) and a meniscus (M) is created between the edge portion (10) and the second wall (9) which forms a seal between the second wall (9) and the edge portion (10) of the chamber wall (23).