INK SUPPLY UNIT AND PRINTER HEAD

摘要

PROBLEM TO BE SOLVED: To stably hold ink without leaking the ink while making an ink storage amount large and the structure simple. SOLUTION: There are provided an ink storage part 20, an ink chamber 51 coupled to the ink storage part 20 so that ink in the ink storage part 20 can flow down, and a valve 52 which is excited to shut between the ink storage part 20 and the ink chamber 51 and is moved to make the ink storage part 20 and the ink chamber 51 communicate with each other by a pressure decrease in the ink chamber 51 generated when ink is supplied from an ink send-out part 54 of the ink chamber 51. The ink storage part 20 is provided with an outdoor air communication hole 42a which is formed to communicate with the outdoor air for taking inside the air of an amount corresponding to a reduction amount of the quantity of ink when the quantity of ink reduces because the ink is sent from the ink storage part 20 to the ink chamber 51.