Ink box liquid level and pressure combined control device

Abstract

The invention relates to an ink box liquid level and pressure combined control device. The ink box liquid level and pressure combined control device comprises spray heads, an external ink pool, an ink return pump, a pressure sensor and a controller, wherein the spray heads are connected with an ink box; the external ink pool is connected with an inlet of the ink box through an ink feeding pump; one end of the ink return pump is connected to the external ink pool through a pipeline, and the other end of the ink return pump is connected with an outlet of the ink box through a pipeline; the pressure sensor is mounted on the ink box and used for detecting the actual pressure value of the interior of the ink box; and the controller acquires data of the pressure sensor, works out and outputs the control voltage of both the ink feeding pump and the ink return pump and then controls the actual output flow of both the ink feeding pump and the ink return pump so as to control the pressure and liquid level in the ink box. By means of the ink box liquid level and pressure combined control device, only one pressure sensor is needed to achieve double control over the liquid level and the pressure, and a liquid level sensor with poor reliability is omitted, so that the reliability of the whole device is greatly improved.

Description

technical field [0001] The invention relates to the technical field of printing ink supply, in particular to an ink cartridge liquid level and pressure combined control device and method. Background technique [0002] The commonly used ink-jet printing ink supply system in the prior art usually uses the ink cartridge as the print nozzle, that is, the ink cartridge directly provides ink and printing pressure at the same time. Existing general technology, such as patent CN101117055A, is to control the liquid level of the ink cartridge through the detection of the liquid level sensor, and to control the ink environment pressure, pressure and liquid in the ink cartridge through the pressure generator (such as positive and negative pressure gas generating device, etc.) The level control is completely independent, and there are many sensors and control devices used, especially gas devices and liquid devices. Once some devices (such as liquid level sensors) fail, the ink will direc...

AI Technical Summary

Problems solved by technology

Existing general technology, such as patent CN101117055A, is to control the liquid level of the ink cartridge through the detection of the liquid level sensor, and to control the ink environment pressure, pressure and liquid in the ink cartridge through the pressure generator (such as positive and negative pressure gas generating device, etc.) The level control is completely independent, and there are many sensors and control devices used, especially gas devices and liquid devices. Once some devices (such as liquid level sensors) fail, the ink will directly enter the gas device, which will cause serious damage to the system. irreparable damage

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