Patent ID: 6682171
Filing Date: 2004-01-27
Classification: B41J

Abstract:
An ink jet head unit for performing color printing by using a plurality of ink nozzle arrays each for use in printing one line, the plurality of ink nozzle arrays corresponding to a plurality of basic colors,the ink jet head unit comprising: a plurality of head groups each formed by a plurality of ink jet heads, and having the plurality of ink nozzle arrays arranged therein such that the plurality of ink nozzle arrays are divided among the plurality of head groups; a plurality of sub-carriages having respective ones of said plurality of head groups mounted thereon; and a unitizing carriage having said plurality of sub-carriages mounted thereon; wherein the plurality of ink nozzle arrays are each divided into a plurality of divisional ink nozzle arrays with respect to a direction along the one line, and are grouped into a plurality of divisional ink nozzle array groups each formed of corresponding ones of said plurality of divisional ink nozzle arrays, and wherein the plurality of ink jet heads of each of said plurality of head groups have the plurality of divisional ink nozzle arrays of a corresponding one of the plurality of divisional ink nozzle array groups arranged therein such that the plurality of divisional ink nozzle arrays are divided among the plurality of ink jet heads.