Browse Prior Art Database

Ink Jet Head

IP.com Disclosure Number: IPCOM000087441D
Original Publication Date: 1977-Jan-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Krause, KA: AUTHOR

Abstract

This ink jet head structure (Fig. 1) includes two rows 10 and 11 of ink jet nozzles and two rows 12 and 13 of charge electrodes, but eliminates a center deflection electrode between resultant ink jet streams 14 and 15 (Figs. 2 and 3) by charging the drops to be deflected in row 14 oppositely to those in row 15. In Fig. 1, the head is at an angle delta with respect to a print line, but the angle may be zero for lower resolution printing.

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Ink Jet Head

This ink jet head structure (Fig. 1) includes two rows 10 and 11 of ink jet nozzles and two rows 12 and 13 of charge electrodes, but eliminates a center deflection electrode between resultant ink jet streams 14 and 15 (Figs. 2 and 3) by charging the drops to be deflected in row 14 oppositely to those in row 15. In Fig. 1, the head is at an angle delta with respect to a print line, but the angle may be zero for lower resolution printing.

As shown in Fig. 3, outer deflection plates 16 and 17 generate a uniform deflection field therebetween. Drops from drop generator 18, which are uncharged, continue along paths 14 and 15 to impact paper 19 for printing. Drops which are not to be used for printing in streams 14 are charged by electrodes 12 at a first polarity to be deflected along paths 20 to sump 21, and those in streams 15 are charged by electrodes 13 at the opposite polarity to be deflected along paths 22 to sump 23.

Startup and shutdown of the ink jet system are illustrated in Fig. 2. There, the charge electrodes 12 and 13 and the deflection electrodes 16 and 17 are moved out of the way and the sumps are moved into contact to prevent splatter of ink on the paper 19 and the charge and deflection electrodes. All drops are charged and deflected at angle Beta before the sumps are moved apart upon startup and before being moved together for shutdown. This prevents drops from reaching the paper during the sump movement.

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