초록 ▼

An ink-on-demand type ink jet printer includes a printer head having at least one nozzle, pressure chamber and means for pressurizing an ink in the pressure chamber so as to effect ejection of an ink droplet from a nozzle to effect printing during a printing operation. The printer further includes a

An ink-on-demand type ink jet printer includes a printer head having at least one nozzle, pressure chamber and means for pressurizing an ink in the pressure chamber so as to effect ejection of an ink droplet from a nozzle to effect printing during a printing operation. The printer further includes a pump for pressurizing an ink in the printer head and a pump driver for driving the pump continuously for a predetermined period of time after the printing operation has ceased during which a small amount of ink is partially ejected from the nozzle. A nozzle cover is provided for selectively covering the nozzle, with the nozzle cover moving to cover the nozzle during the predetermined period of time when the pump driving means is operating while ink is partially ejected from the nozzle to prevent ink clogging during a no-print condition after the printing operation has ceased.

대표청구항 ▼

An ink-on-demand type ink jet printer comprising a printer head, said printer head including at least one nozzle, pressure chamber, and means for pressurizing an ink in said pressure chamber so as to effect ejection of an ink droplet from a nozzle, a pump means for pressurizing an ink in said printe

An ink-on-demand type ink jet printer comprising a printer head, said printer head including at least one nozzle, pressure chamber, and means for pressurizing an ink in said pressure chamber so as to effect ejection of an ink droplet from a nozzle, a pump means for pressurizing an ink in said printer head, a pump driving means for driving said pump means continuously for a predetermined period of time during which a small amount of ink is partially ejected from said nozzle, and a nozzle cover means for selectively covering said nozzle, said nozzle cover means moving to cover said nozzle during said predetermined period of time when said pump driving means is operating while ink is being ejected from said nozzle, further comprising first, second and third coaxial cams, an ink container having a pump hole and a vent hole, a pump lever drivable by said first cam for pushing said pump means towards said pump hole, a vent hole cover, a vent hole lever drivable by said second cam for pushing said vent hole cover toward said vent hole, and a cover lever having said nozzle cover means drivable by said third cam for closing said nozzle.