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Upward Ink Droplet Printer Trap

IP.com Disclosure Number: IPCOM000073679D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Haskell, JW: AUTHOR [+2]

Abstract

The electrostatic trap is designed to enable an ink jet stream to print on the underside of a document disposed above the ink jet stream. In conventional ink jet printers, the stream is directed either downwardly or horizontally upon the document, in which case the trapping of nonprinting droplets poses no problem. The trap shown in Drawings A and B comprises a configured grounded shield 1 having an extended lip la which intercepts unwanted droplets 2a of an upwardly directed jet stream 2 issuing from a nozzle 3, and passing onto a document 4 located above the jet stream.

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Upward Ink Droplet Printer Trap

The electrostatic trap is designed to enable an ink jet stream to print on the underside of a document disposed above the ink jet stream. In conventional ink jet printers, the stream is directed either downwardly or horizontally upon the document, in which case the trapping of nonprinting droplets poses no problem. The trap shown in Drawings A and B comprises a configured grounded shield 1 having an extended lip la which intercepts unwanted droplets 2a of an upwardly directed jet stream 2 issuing from a nozzle 3, and passing onto a document 4 located above the jet stream. Unwanted droplets are deflected by the lip portion la and attracted toward a charged plate 5 which causes the droplets 2a to break down into finer droplets, These droplets are collected by the charged plate and thereafter fall, under the influence of gravity, into a troughlike portion 6 of the trap assembly. The charge on the plate 5 is generally the same as that applied to one of the deflection plates 8 forming a part of the conventional jet printing assembly.

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