Purgeable multiple-orifice drop-on-demand ink jet print head hav

Details Purgeable multiple-orifice drop-on-demand ink jet print head hav Purgeable multiple-orifice drop-on-demand ink jet print head hav

1997-04-22

1998-07-14

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

347 94, B41J 217

Patent

active

057812128

ABSTRACT:
An ink jet print head (10) has a supply channel (14, 24, 52) connecting an ink source with an upper manifold (60U) and a lower manifold (60L). Each manifold has a tapered structure. From each manifold multiple inlet channels (36, 34, 44, 54) each lead to a respective pressure chamber (28) from which an outlet channel (40, 38, 46, 56, 62, 76, 82) leads to nozzles (88) from which droplets of liquid ink are expelled as a result of the action of a pressure transducer on the pressure chamber. Each manifold is separated from the supply channel by a baffle structure (92) that includes three baffles (94) formed by alternating plates (64, 78) having an open manifold with plates (58, 72) having a blocked manifold. The baffle structure reduces jetting nonuniformity by damping pressure displacement waves in the ink caused by the expulsion of ink droplets. The baffle structure also promotes effective heat transfer from the print head to ink being drawn in to the print head from the ink source. The print head is operated by drawing ink from the supply channel through the baffle structure to replace ink drawn from the manifold as a result of expulsion of ink from the nozzles.

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