Nozzle protection circuit and nozzle control board

Abstract

The invention provides a spraying head protective circuit which comprises an introduction circuit, a comparison circuit and a shutdown circuit. The introduction circuit is used for introducing signals to be detected into the comparison circuit, the comparison circuit is used for comparing the signals and judging whether the signals to be detected are normal or not, the shutdown circuit comprises at least one switch and is used for shutting down the output of a spraying head, the comparison circuit is connected between the introduction circuit and the shutdown circuit, and the output end of the shutdown circuit is connected with a plug-in card of the spraying head through a card bed. When the input of the signals which are introduced into the circuit to be detected is abnormal, the output of the comparison circuit enables a switch in the shutdown circuit to be disconnected, and therefore the output to the spraying head is shut down.

Description

technical field [0001] The invention relates to a nozzle protection circuit, in particular to a nozzle protection circuit for an inkjet printer which protects the nozzle when printing is started, and a nozzle control board provided with the nozzle protection circuit. Background technique [0002] In recent years, due to the high printing speed and excellent image resolution of inkjet printing, and the combination of inkjet printing equipment and computers makes the design and layout of the final image more flexible, the popularity of inkjet printing technology The degree is getting higher and higher. [0003] Existing inkjet printing technologies include piezoelectric inkjet printing technology and thermal foam inkjet printing technology. Piezoelectric inkjet printing technology is to place many small piezoelectric ceramics near the nozzle of the nozzle, and use the principle that piezoelectric ceramics will deform under the action of voltage, and apply voltage to it in tim...

AI Technical Summary

Problems solved by technology

There are multiple high-voltage signals on the pins of the nozzle driving circuit, such as the nozzle ignition driving voltage VPP, the nozzle logic power supply voltage VH, and the nozzle heating driving voltage VHEAT, and the high-voltage signal and the low-voltage signal are designed in adjacent positions. It is relatively dense, and the distance between adjacent pins is as small as 0.3mm. Once ink, cleaning fluid and other liquids remain between the high and low voltage signal pads, or when the nozzle card is accidentally loosened and shaken during long-term use, there will be It may lead to the conduction between the low-voltage signal pin adjacent to the high-voltage pin and the high-voltage signal pin, resulting in the loss of print data, all or all or random output of the print data, and the temperature value cannot be sampled, etc. Seriously, it will directly burn out Nozzle or a chip connected to the nozzle holder

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