Field replaceable modules for ink jet head assembly

Details Field replaceable modules for ink jet head assembly Field replaceable modules for ink jet head assembly

G - Physics

01

D

101/96.021

G01D 15/18 (2006.01) B41J 2/135 (2006.01)

Patent

CA 1156708

FIELD REPLACEABLE MODULES FOR INK JET HEAD ASSEMBLY Abstract The ink jet head assembly disclosed herein has modular subassemblies with predetermined relation- ships between the subassemblies to minimize realign- ment of the ink stream when a subassembly is replaced in the field. The head assembly is modularized into nozzle, charge electrode, deflection electrode and gutter subassemblies. The charge electrode module is mounted on the nozzle module in a manner such that no field adjustment is necessary to center the charge electrode horizontally to the ink stream. The deflection electrode module is mounted on the gutter module in a manner such that no field adjust- ment is necessary to center the deflection electrode horizontally to the ink stream. The nozzle and charge electrode subassembly have a preset adjust- ment, and the gutter and deflection electrode assembly have a preset adjustment such that no field adjust- ment between these two subassemblies is necessary to maintain a constant flight distance for the ink drops. Finally, the nozzle module is adjustable to reposition the ink stream about the pitch axis (vertical adjustment) and the yaw axis (horizontal adjustment). The yaw axis adjustment may be preset. The pitch axis adjustment is the only mechanical adjustment necessary in the field when replacing the nozzle module. B0979021

362810

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