| 摘要 |
PURPOSE:To make it possible to prevent the clogging of an orifice by making it possible to easily remove air bubbles in a liquid flowline, by providing two filters respectively having specific diameters to the liquid flowline communicated with the orfice. CONSTITUTION:Ink 13 is supplied to the sub-tank 12 in an ink jet recording unit 1 from an ink tank 2 through a tube 3 and a liquid flowline 14 is provided to the bottom of said sub-tank 12. One end of said flowline 14 is guided into the sub-tank 12 and provided with a first filter 15 having a function for adjusting pressure balance in an emitting direction when liquid droplets are formed and an anti-emitting direction. The average diameter of said filter 15 is made equal to or more than that of an orifice 16. Further, second filters 18, 19 each having a max. diameter equal to or less than the diameter of the orifice 16 are provided to a part of the sub-tank 12. |
