Negative pressure system for nozzle of ink-jet printer and negative pressure control method thereof

Abstract

The invention discloses a negative pressure system for a nozzle of an ink-jet printer and a negative pressure control method thereof. The negative pressure system comprises a negative pressure cavity, a vacuum pump, an auxiliary ink box and a control system, wherein the negative pressure cavity is connected with the vacuum pump, an air source and the auxiliary ink box through a plurality of two-position three-way valves respectively; the negative pressure cavity is also connected with a negative pressure sensor for detecting negative pressure in the negative pressure cavity; and the control system controls the open or the close of each two-position three-way valve and the power-on or the power-off of the vacuum pump according to signals fed back by the negative pressure sensor so as to control the negative pressure in the negative pressure cavity accurately, realize continuous, stable, quick and proper ink supply to the nozzle by the auxiliary ink box, and improve the working stability of the printer. The negative pressure system is also connected with an ink pressing system in series through the two-position three-way valves, and the ink pressing system comprises a pressure pump and a flow limiting valve; and when the nozzle is blocked, the nozzle is communicated with the ink pressing system by controlling the two-position three-way valves, the nozzle is dredged by ink pressing, and air is released after the ink pressing is completed so as to prevent other nozzles from dropping ink, and improve the printing quality of the printer.

Description

technical field [0001] The invention relates to an ink-jet printer nozzle negative pressure system and a negative pressure control method thereof. Background technique [0002] Existing inkjet printers are equipped with sub-inks that continuously supply ink to the nozzles. The installation height of the sub-inks is usually higher than the nozzles. Affected by gravity, ink can naturally flow from the sub-tanks into the nozzles. However, in order to achieve faster printing speed, the existing nozzle R&D and manufacturing technology level has been continuously improved, and the ignition frequency of nozzles for industrial inkjet printing is getting faster and faster. In order to ensure excellent printing quality at high printing speed, The printer is required to supply ink to the nozzle continuously, stably, quickly and in an appropriate amount according to the printing needs. If the negative pressure is too low, the ink will continue to flow down under the action of gravity, ...

AI Technical Summary

Problems solved by technology

If the negative pressure is too low, the ink will continue to flow down under the action of gravity, and the excessive ink supply will cause ink dripping in the nozzle; if the negative pressure is too high, the ink in the nozzle will flow back, and the ink in the sub-ink box will not flow to the nozzle in a timely and appropriate amount. As a result, the nozzle has no ink to spray, and the ink is broken, which affects the printing quality

[0003] The negative pressure system of the existing inkjet printer does not control the negative pressure accurately, and it is easy to cause the above problems caused by inaccurate adjustment of high and low negative pressure

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