| 摘要 |
PURPOSE:To shorten the time till the start up of printing by a method in which filled ink for preventing clogging is discharged to an unnecessary ink recovery means prior to printing operation, and ink is forcibly jetted from the first orifice. CONSTITUTION:In ink heads 5a-5d where an air chamber 20 is filled with ink for preventing clogging, air from an air pump is added to the air chamber 20 through a pipe 19 against a gutter 30 prior to printing operation, and packed ink is discharged into the gutter 30 for recovery. Afterwards, ink in a cartridge is sent under pressure into the ink chamber through a pipe 15 to discharge packed ink 25' back-flowing to the ink chamber 14 through the first orifice 16 during the discharge operation, and ink from the first orifice 16 is dropped into the gutter 30. A continuous jet signal is supplied to the head and residual ink adhered to the wall of the air chamber 20 is removed. The jet operation of ink droplets can thus be stabilized in a short time. |
