| 摘要 |
PURPOSE:To prevent the intrusion of air bubbles generated inan ink supply tube into the head by providing an air bubble trap and an ionization electrode to the ink supply tube of the ink jet head and also providing an air bubble collecting electrode to the air bubble trap. CONSTITUTION:An ionization electrode 4 is attached to the inside of a supply tube 5 through which ink is directed to the head 1 in such a way as to directly make it contact with ink, and a collecting electrode 2 is attached to the outside of an air bubble trap 3. The cross section of the tube 5 is made smaller in the ionization electrode 4 portion, thereby shortening the distance between the electrodes and also raising the pressures of the portion. A high frequency and high voltage is applied to the ionization electrode 4, and a DC voltage is applied to the collection electrode. Under the condition, air bubbles are made smaller in the ionization electrode portion of the supply tube and ionized by high-frequency and high voltage. The ionized air bubbles are divided into positive and negative ions and attracted by electric field of the collection electrode to collect the air bubbles. |
