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Inkjet Nozzle Incorporating Serpentine Actuator - Silverbrook Research Pty Ltd
United States Patent Application 20080012903
B41J2/04; B21D53/76; B41J2/045; B41J2/14; B41J2/16; B41J2/175; B41J3/42; B41J3/44; B41J11/00; B41J11/70; B41J15/04; G01D15/00; G06F1/16; G06F21/00; G06K1/12; G06K7/14; G06K19/06; G06K19/073; G07F7/08; G07F7/12; G11B5/127; G11C11/56; H04N1/21; H04N1/32; H04N5/225; H04N5/262; H05K3/20; B41J2/165; H04N1/00
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1. A nozzle for an ink jet printer, the nozzle comprising: a roof layer which defines a nozzle port through which ink can be ejected; an endless substrate layer fast with the roof layer and defining a nozzle chamber wall which tapers inwardly toward the nozzle port; and an actuator assembly fast with the endless substrate layer and comprising an endless support, the actuator assembly further comprising a serpentine coil element cantilevered to extend from the endless support, the serpentine coil element configured to bend away from the nozzle port during quiescence and straighten during actuation to eject ink through the nozzle port.
The present application is a continuation of U.S. application Ser. No. 11/349,074 filed on Feb. 8, 2006, which is a continuation of U.S. application Ser. No. 10/982,789 filed on Nov. 8, 2004, now issued as U.S. Pat. No. 7,086,720, which is a continuation of U.S. application Ser. No. 10/421,823 filed on Apr. 24, 2003, now issued as U.S. Pat. No. 6,830,316, which is a continuation of U.S. application Ser. No. 09/113,122 filed on Jul. 10, 1998, now issued as a U.S. Pat. No. 6,577,977 all of which are herein incorporated by reference.
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A linear actuator 128 is provided for rapidly compressing a nickel ferrous plunger 130 into the nozzle chamber 122 so as to compress the volume of ink within the chamber 122 to thereby cause ejection of drops from the ink ejection port 126. The plunger 130 is connected to a stepper moving pole device 132 of the linear actuator 128 which is actuated by means of a three phase arrangement ofelectromagnets 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156. The electromagnets are driven in three phases with electro magnets 134, 146, 140 and 152 being driven in a first phase, electromagnets 136, 148, 142, 154 being driven in a second phase and electromagnets 138, 150, 144, 156 being driven in a third phase. The electromagnets are driven in a reversible manner so as to de-actuate the plunger 130 via actuator 128. The actuator 128 is guided at one end by a means of a guide 158, 160. At the other end, the plunger 130 is coated with a hydrophobic material such as polytetrafluoroethylene (PTFE) which can form a major part of the plunger 130. The PTFE acts to repel the ink from the nozzle chamber 122 resulting in the creation of menisci 224, 226 (FIG. 59(a)) between the plunger 130 and side walls 162, 164. The surface tension characteristics of the menisci 224, 226 act to guide the plunger 130 within the nozzle chamber 122. The menisci 224, 226 further stop ink from flowing out of the chamber 122 and hence the electromagnets 134 to 156 can be operated in the atmosphere.
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