| 摘要 |
PURPOSE:To improve an ink jet pen so that it is capable of performing stable ink jetting by such an arrangement wherein the size of such components of the pen as a lowermost nozzle, an intemediate pressure chamber and an uppermost ink storage is made larger in sequence from lower to upper, and one end of an air supply tube having openings at its both ends is protruded into the ink storage and the other end is protruded into the atmosphere. CONSTITUTION:For filling and supplying ink, a cap 36 is removed and ink is continuously injected into a nozzle pipe 32 and it descends by gravity through the hole of the nozzle pipe 32 so that it clogs the hole and expels air from a nozzle 34 since the inner diameter of the nozzle pipe is selected smaller than the size of the outlet of an ink storage I, and the pipe is filled up with ink without leaving air bubbles. When ink reaches a specified level, ink injection is stopped and the cap 36 is pressure installed and an air storage A is formed at the upper part of the pipe. After that, ink droplets 51 are spouted by impressing a pulse voltage to a pressurizing member 35 and ink is supplied from an air supply pipe 37 while ink remains there, and after that air bubbles are formed at the lower end of the air supply pipe 37 and they are separated and integrated with the air storage A. Consequently, ink pressure is substantially stabilized. |
