Printing head cleaning device and cleaning method

Abstract

The invention relates to a printing head cleaning device and cleaning method. The device comprises a control circuit, a pump, a pipe, a valve and an upper cleaning box, wherein the control circuit is provided with a storage, the first end of the pipe is connected with the pump, the valve is arranged on the pipe and controlled by the control circuit to be opened or closed, and the upper cleaning box is used for containing cleaning fluid. The upper end of the upper cleaning box is communicated with the second end of the pipe, and the lower end of the upper cleaning box is communicated with an ink feeding needle of a printing head. A pressure lower threshold value is stored in the storage. A pressure sensor detecting the pressure of an inner cavity of the upper cleaning box feeds back a pressure value to the control circuit. The method comprises the preparation step that the lower end and the ink feeding needle are connected, the regulation step that the control unit controls the pump to regulate the pressure of the inner cavity of the upper cleaning box, the detection step that the pressure sensor detects the pressure of the inner cavity of the upper cleaning box and feeds the pressure value of the inner cavity back to the control circuit, and the judgment step that the control circuit judges whether the pressure value is smaller than the pressure lower threshold value or not. If not, the pressure regulation step is repeated, and if yes, cleaning is stopped. By means of the printing head cleaning device and cleaning method, whether dredge of the printing head is completed or not can be accurately judged.

Description

Technical field [0001] The invention relates to a printing head cleaning device and a printing head cleaning method. Background technique [0002] In order to save printing costs, different types and / or different brands of inks are often used alternately on the same printer. For example, a printer that originally uses pigment inks uses dye ink or solvent ink. After replacing the ink, different types of ink react in the print head and produce deposits that cause the nozzle holes of the print head to be blocked. Therefore, the print head needs to be cleaned, usually by removing the print head and asking professionals for cleaning and maintenance. In order to reduce the user's print head maintenance operations and costs, some printers on the market have installed a print head cleaning program for users to choose from. But if there are some large deposits in the print head channel, even if a special cleaning box is used, the printer's own cleaning function will not be able to clean...

AI Technical Summary

Problems solved by technology

However, using this method, it is impossible to directly and accurately judge whether the print head has been unblocked. It is necessary to put the print head back into the printer for a printing test to confirm whether the cleaning is complete, that is, whether the print head is completely unblocked.

In addition, there is a greater risk of the print head being damaged by excessive pressure

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