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Fluid Circuit for Fast Startup of an Ink Jet Head

IP.com Disclosure Number: IPCOM000082230D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Brady, MJ: AUTHOR [+3]

Abstract

This fluid circuit permits fast pressure buildup in the ink manifold such that the jets start up quickly without drooping, by which wetting of head components downstream from the nozzle is prevented.

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Fluid Circuit for Fast Startup of an Ink Jet Head

This fluid circuit permits fast pressure buildup in the ink manifold such that the jets start up quickly without drooping, by which wetting of head components downstream from the nozzle is prevented.

An ink reservoir 2 is under pressure for supplying ink to an ink manifold 4 by way of a valve 6. The ink is passed through a nozzle plate 8, a charge plate 10 and deflection plates 12.

First a valve 14 is opened, followed by the opening of the valve 6. This results in little or no fluid flow through the nozzles due to the high-flow impedance and surface tension at the nozzle. The majority of fluid flow is through the valve 14 to a collector 16 which is at atmospheric pressure.

The valve 14 is closed shortly after the opening of the valve 6, resulting in a rapid conversion of the velocity head of fluid motion to a pressure head, resulting in a high-pressure surge in the fluid circuit. Initially the ink manifold 4 experiences a pressure higher than that of the source reservoir 2, by which fast startup of the jets is accomplished.

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