Ink jet printing apparatus having redundant nozzles

Details Ink jet printing apparatus having redundant nozzles Ink jet printing apparatus having redundant nozzles

1997-11-04

2000-06-20

Grimley, Arthur T.

Incremental printing of symbolic information

Ink jet

Controller

347 19, 347 40, B41J 2938

Patent

active

060769106

ABSTRACT:
An ink jet printing apparatus is provided comprising a print cartridge including a heater chip and a nozzle plate coupled to the heater chip. The heater chip has first, second, third and fourth heating elements, and the nozzle plate has a plurality of primary and secondary nozzles. The primary nozzles include first and second nozzles positioned in first and second nozzle plate columns and the secondary nozzles include third and fourth nozzles positioned in third and fourth nozzle plate columns. Each of the nozzles has one of the heating elements associated therewith for generating energy to discharge ink therefrom. The apparatus further includes a driver circuit, electrically coupled to the print cartridge, for applying firing pulses to the heating elements. The apparatus further includes a nozzle testing station. There, each nozzle is tested to determine if it is operable.

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