| 摘要 |
PURPOSE:To eliminate clogging of a head nozzle by discharging an ink in a head on a preset condition and further a washing liquid introduced. CONSTITUTION:When printing, a head 1 and a suction cap 11 are kept open. A changeover valve 4 is made to communicate with an ink conduit 5 and a conduit 5 to an ink tank 6 to perform a printing on a recording paper. When printing is not done, the suction cap 11 gets tight on a nozzle end face 2 of the head 1 and the chageover valve 4 is switched to communicate with an ink conduit 3 and a conduit 7 to a washing liquid tank 10 while a opening or closing means 9 closes the opening of a branch tube 8 to operate a suction pump 13. The pressure in the suction cap 11 is rendered negative via a conduit 12 to suck out an ink in the head 1 while a washing liquid in the washing liquid tank 10 is introduced into the head 1. Then, as the opening or closing means 9 opens the opening of the branch tube 8 to introduce air, the washing liquid is discharged into a waste liquid tank 15 via the suction pump 13 from the suction cap 11. |
