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Residual Ink Removal System on Magnetic Ink Jet Printer Nozzles

IP.com Disclosure Number: IPCOM000083466D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Bush, RF: AUTHOR [+3]

Abstract

When an ink jet printer is shut down, a residual ink deposit may be formed adjacent the nozzle exit aperture, which deposit may lead to clogging of the nozzle or misalignment of the jet stream once the ink jet printer is again turned on.

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Residual Ink Removal System on Magnetic Ink Jet Printer Nozzles

When an ink jet printer is shut down, a residual ink deposit may be formed adjacent the nozzle exit aperture, which deposit may lead to clogging of the nozzle or misalignment of the jet stream once the ink jet printer is again turned on.

The clogging of the nozzle may be seen with reference to Fig. 1, in which an ink jet manifold 2 has a nozzle plate 4 attached thereto which includes a nozzle aperture 6. When the ink jet system is turned down, that is, the ink in manifold 2 is no longer under pressure, a convex meniscus 8 is formed about the exit aperture of the nozzle 6 and ink may build up such as at the areas 10 and 12 and the interior of the nozzle, resulting in clogging.

In Fig. 2 the same ink jet system is illustrated with a vacuum being applied to the ink in the manifold 2, such that a concave meniscus 14 is formed in the interior of the manifold so that there is no ink in direct contact with the nozzle aperture 6, and accordingly there can be no ink deposit formed on the aperture resulting in clogging thereof.

Fig. 3 illustrates an ink jet printing system in which a vacuum is applied to the manifold 2, so that a concave meniscus is formed in the interior of the manifold, as illustrated in Fig. 2.

When the system is printing a switch 16 is closed providing current to a coil 18 of a relay 20 having contacts 22 and 24, which are in the position shown when the relay is energized. Current flows from a so...