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Repelling Undesired Ink Drops

IP.com Disclosure Number: IPCOM000085979D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Bacon, JL: AUTHOR [+2]

Abstract

In the drawing, paper 10 is electrostatically tacked to dielectric layer 12 on print drum 14. The print drum itself is conductive and grounded. Paper 10 is positively charged by corona 16. Positive charging of paper 10 helps hold the paper 10 on the drum 14, and also prevents charged drops from hitting the paper 10 as will be described.

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Repelling Undesired Ink Drops

In the drawing, paper 10 is electrostatically tacked to dielectric layer 12 on print drum 14. The print drum itself is conductive and grounded. Paper 10 is positively charged by corona 16. Positive charging of paper 10 helps hold the paper 10 on the drum 14, and also prevents charged drops from hitting the paper 10 as will be described.

Nozzle 18 projects ink droplets towards paper 10. If switch 20 is open, no charge is applied to the drops by charge ring 21 and they proceed straight along path 22 to strike paper 10. If switch 20 is closed, the ink droplets trap positive charge as they break off from the ink stream at the charge ring 21. Positively charged drops are the deflected by deflection plates 24 along path 26 to strike the gutter 28. Ink in the gutter 28 is returned to the ink supply 30.

If for any reason, such as partial charge, an ink drop is positively charged and is not deflected enough to strike gutter 28, it would proceed along path 32 to strike the paper 10. However, since the paper 10 has a positive charge and since the deflected drop on path 32 has a positive charge, the two charges mutually repel. As a result the charged drop as it approaches the paper 10 will explode or vaporize as depicted at drop 34. This diffuses the effect of an incorrect drop or creates an ink vapor that can be removed by slight air flow away from the paper 10.

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