| 摘要 |
PURPOSE:To enable the mixture of colors of ink when an apparatus is not operated by a constitution wherein the sealing member of a piston sucking ink or air in a head is formed so that it can block up the suction port of a cylinder member in an ink jet printer. CONSTITUTION:At the time when an apparatus is not operated, the tip of each nozzle of a head is covered up tightly by a cap 14, and a piston 19, i.e. a seal 20, is depressed. Then a space 23 is expanded, a valve 8 is closed to generate a negative pressure, and thereby ink of different colors is made to flow from each subtank into a connection tube 13 and an air-bleeding tube 17. When the piston 19 is returned before the space 23 is filled up, that is, in the state of negative pressure, a suction port 21 is blocked up by the seal 20 and thereby the inside of the connection tube 13 is held under the negative pressure. The ink in the space 23 is discharged from a discharge hole 7. Thus, the meniscus of each nozzle is normalize to enable the discharge of ink, while each of the tubes 13 and 17 is sealed separately by a projection member 20B in the lower part of the seal 20, and thereby the mixture of colors of ink is prevented. |
