Browse Prior Art Database

Flow Reversing Valve for Ink Jet Head

IP.com Disclosure Number: IPCOM000085712D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Vesci, A: AUTHOR

Abstract

Ink jet heads include one or more small orifices in a nozzle plate 10, through which pressurized ink 11 is ejected to form a plurality of parallel ink jet streams 12. The orifices may be exceedingly small, in the order of 1 mil diameter, and, hence, any orifice may become wholly or partially clogged.

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Flow Reversing Valve for Ink Jet Head

Ink jet heads include one or more small orifices in a nozzle plate 10, through which pressurized ink 11 is ejected to form a plurality of parallel ink jet streams
12. The orifices may be exceedingly small, in the order of 1 mil diameter, and, hence, any orifice may become wholly or partially clogged.

A way of removing such clogs is shown and comprises sliding a cover 13 over the nozzle plate 10 to form a closed cavity 14 in front of the nozzle plate. The pressure may then be removed from ink 11 through line 18 and a pressurized fluid (e.g., water or air) supplied to the closed cavity 14 to reverse flush the nozzle orifices, dislodging clogs.

Various ways of actuating the cover or valve 13 are possible. In the embodiment shown, two solenoids 15 and 16 operate the ink jet system normally by supplying pressurized ink 11 on line 17 and maintaining pressure 20 to open valve 13, while maintaining atmospheric pressure or a slight vacuum on lines 19,
21. To reverse flush the nozzle plate 10, the solenoids 15, 16 establish a slight vacuum on line 18 and supplies the flushing fluid on line 19 to close cover valve 13 and reverse flush the nozzle plate.

Alternatively, the cover 13 may be in a fixed position at a "home" station to which the head is moved when reverse flushing is desired.

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