Anti-blocking nozzle of inkjet printer and printing method

Abstract

The present invention discloses an anti-blocking nozzle and a printing method for an inkjet printer, comprising a nozzle assembly, the nozzle assembly comprising a first electrode, a second electrode, a controller, a valve, a nozzle, a charger, an ink pump, an ink cartridge and an ink delivery pipeline; the ink cartridge is fixedly connected with an ink pump above, and the input end of the ink pump is placed at the bottom of the ink cartridge, the output end of the ink pump is fixedly connected with one end of the ink delivery pipeline, the other end of the ink delivery pipeline is connected with the nozzle through a valve, and the surface of the ink delivery pipeline close to the nozzle end is sleeved with a charger and a first electrode; the charger of the present invention charges the ink before the ink enters the nozzle; the controller controls whether the ink is ejected and the printing speed by controlling the printing electric field. When the printer is not in use, the printing electric field will reverse and press the ink back to the top of the valve, and the valve will be closed at the same time, thereby avoiding clogging of the nozzle due to ink solidification.

Description

Technical Field

[0001] The invention relates to the technical field of anti-clogging nozzles for inkjet printers, in particular to an anti-clogging nozzle for inkjet printers and a printing method. Background Art

[0002] With the rapid development of display products, people have been deepening their research on the production process of display products. Inkjet printing, as a patterning technology that can be printed without plate or pressure, has strong adaptability, low cost, high resolution and multi-color printing, can be printed on substrates of various materials, and has attracted widespread attention.

[0003] The principle of conventional inkjet printing is as follows: the ink pump ejects the ink from the nozzle at a certain pressure to form a continuous ink flow. This ink flow obtains static electricity in the metal tube charged with high voltage in the print head and becomes an orderly arranged ink droplet flow. The pressure and voltage amplitude of the ink pump are adjusted to produce as many micro-ink droplets as possible. When the ink droplet flow passes through the high-voltage electrical pipeline, the micro-ink droplets are charged. According to the algorithm, the charged micro-ink droplets are deflected under the action of the DC electric field of the deflection electrode to form a printed ink beam, which is ejected onto the substrate to complete the printing. Uncharged ink droplets or ink droplets that have not received the deflection signal are not deflected and are recycled by the ink system.

[0004] Nozzle clogging is a common problem with existing inkjet printers. Nozzle clogging can lead to problems such as reduced print quality, blurred patterns, and may even damage the printer. Among the various reasons that lead to nozzle clogging, the most common cause of nozzle clogging is the drying and agglomeration of ink at the nozzle.

[0005] Therefore, an anti-blocking nozzle and printing method for an inkjet printer are needed to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an inkjet printer anti-blocking nozzle and a printing method to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-clogging nozzle of an inkjet printer, comprising a nozzle assembly, wherein the nozzle assembly comprises a first electrode, a second electrode, a controller 1, a valve, a nozzle, a charger, an ink pump, an ink cartridge and an ink delivery pipeline; an ink pump is fixedly connected to the top of the ink cartridge, and the input end of the ink pump is placed at the bottom of the ink cartridge, the output end of the ink pump is fixedly connected to one end of the ink delivery pipeline, the other end of the ink delivery pipeline is connected to the nozzle through a valve, a charger and a first electrode are sleeved on the surface of the ink delivery pipeline close to the nozzle end, a printing platform is arranged directly below the nozzle, the first electrode is located above the nozzle and the valve, the second electrode is located below the printing platform, the first electrode and the second electrode are arranged in parallel, the positive projection of the first electrode on the second electrode is located inside the second electrode, and the first electrode and the second electrode form a printing electric field 1.

[0008] Preferably, the nozzle and the valve are located in a printing electric field 1 formed by the first electrode and the second electrode, and the printing electric field 1 is used to control the ejection of ink and the backflow of ink in the nozzle.

[0009] Preferably, the valve is located above the nozzle, and when no printing operation is performed, the ink is controlled by the printing electric field to flow back into the ink delivery pipeline and close the valve.

[0010] Preferably, the charger is located at a portion of the ink delivery pipeline that does not enter the printing electric field formed by the first electrode and the second electrode.

[0011] Preferably, the valve, the first electrode and the second electrode are all connected to a controller via electrical wires.

[0012] Preferably, the anti-clogging nozzle also includes a moving component, and the moving component is used to control the movement of the nozzle and the printing platform in a plane and a parallel plane, and to control the distance between the nozzle and the printing platform.

[0013] A printing method for preventing a nozzle from being blocked in an inkjet printer comprises the following steps:

[0014] Step 1: The charger charges the ink in the ink delivery pipeline;

[0015] Step 2: Open the valve, and the charged ink enters the printing electric field 1, and the printing electric field 1 is controlled by the controller 1;

[0016] Step 3: Under the action of the printing electric field, the ink is ejected from the nozzle and falls on the substrate on the printing table to print;

[0017] Step 4: After printing is completed, the printing electric field 1 is reversed, and the ink flows back to the ink delivery pipeline under the action of the electric field and reaches the top of the valve. The valve is closed, and the printing electric field 1 and controller 1 stop working.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The charger charges the ink before it enters the nozzle; the controller controls whether the ink is ejected and the printing speed by controlling the printing electric field. When the printer is not in use, the printing electric field will reverse and press the ink back to the top of the valve, and the valve will close at the same time, thus avoiding clogging the nozzle due to ink solidification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a plan view of the present invention;

[0021] Figure 2 A plan view of the nozzle, valve and first electrode of the present invention;

[0022] Figure 3 This is a schematic diagram of the first embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the second embodiment of the present invention.

[0024] In the figure: 101, first electrode; 102, second electrode; 103, valve; 104, nozzle; 105, charger; 106, ink pump; 107, ink cartridge; 108, ink delivery pipeline; 109, printing table. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] See also Figure 1-3The present invention provides an anti-clogging nozzle of an inkjet printer, comprising a nozzle assembly, wherein the nozzle assembly comprises a first electrode 101, a second electrode 102, a controller 1, a valve 103, a nozzle 104, a charger 105, an ink pump 106, an ink cartridge 107 and an ink delivery pipeline 108; the ink cartridge 107 is fixedly connected with the ink pump 106 above, and the input end of the ink pump 106 is placed at the bottom of the ink cartridge 107, the output end of the ink pump 106 is fixedly connected with one end of the ink delivery pipeline 108, and the other end of the ink delivery pipeline 108 is connected to the ink cartridge 107 through the valve 103. The ink delivery pipe 108 is connected to the nozzle 104, and a charger 105 and a first electrode 101 are sleeved on the surface of one end of the ink delivery pipe 108 close to the nozzle 104. A printing platform 109 is arranged directly below the nozzle 104. The first electrode 101 is located above the nozzle 104 and the valve 103. The second electrode 102 is located below the printing platform 109. The first electrode 101 and the second electrode 102 are arranged in parallel. The orthographic projection of the first electrode 101 on the second electrode 102 is located inside the second electrode 102. The first electrode 101 and the second electrode 102 form a printing electric field 1.

[0028] The nozzle 104 and the valve 103 are located in a printing electric field 1 formed by the first electrode 101 and the second electrode 102 . The printing electric field 1 is used to control the ejection of ink and the backflow of ink in the nozzle 104 .

[0029] The valve 103 is located above the nozzle 104. When no printing operation is performed, the ink is controlled by the printing electric field to flow back into the ink delivery pipeline 108 and the valve 103 is closed.

[0030] The charger 105 is located at the portion of the ink delivery pipe 108 that does not enter the printing electric field 1 formed by the first electrode 101 and the second electrode 102, so as to charge the ink before the ink enters the printing electric field 1.

[0031] The valve 103 , the first electrode 101 , and the second electrode 102 are all connected to the controller 1 through electric wires, and the valve 103 , the first electrode 101 , and the second electrode 102 are all controlled by the controller 1 .

[0032] The anti-clogging nozzle also includes a moving component, which is used to control the movement of the nozzle 104 and the printing platform 109 in the plane and parallel plane, and to control the distance between the nozzle 104 and the printing platform 109.

[0033] A printing method for preventing nozzle blockage of an inkjet printer, characterized in that it comprises the following steps:

[0034] Step 1: The charger 105 charges the ink in the ink delivery pipe 108;

[0035] Step 2: Open valve 103, and the charged ink enters the printing electric field 1, and the printing electric field 1 is controlled by controller 1;

[0036] Step 3: Under the action of the printing electric field 1, the ink is ejected from the nozzle 104 and falls on the substrate on the printing table 109 to perform printing;

[0037] Step 4: After printing is completed, the printing electric field 1 is reversed, and the ink flows back to the ink delivery pipe 108 under the action of the electric field, and reaches the top of the valve 103. The valve 103 is closed, and the printing electric field 1 and the controller 1 stop working.

[0038] Embodiment 2:

[0039] See also Figure 4 When the anti-blocking nozzle is used in combination with the piezoelectric printing technology, a piezoelectric crystal is also provided on the nozzle 104, the charger 105 charges the ink, the valve 103 is opened, and the charged ink enters the printing electric field 1. The piezoelectric crystal and the printing electric field 1 are controlled by the controller 1, and the controller 2 controls the printing electric field 2. When the directions of the piezoelectric crystal and the electric field force are consistent (or the printing electric field 1 is turned off and only the piezoelectric crystal is used for control, under the action of the piezoelectric crystal), the ink is ejected from the nozzle 104 and falls on the substrate on the printing table. After printing is completed, the piezoelectric crystal no longer works, the printing electric field 1 is reversed, and the ink flows back to the ink delivery pipeline 108 under the action of the electric field and reaches the top of the valve 103. The valve 103 is closed, and the printing electric field 1, the printing electric field 2, the controller 1 and the controller 2 stop working.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-blocking nozzle for an inkjet printer, comprising a nozzle assembly, characterized in that: The nozzle assembly comprises a first electrode (101), a second electrode (102), a controller, a valve (103), a nozzle (104), a charger (105), an ink pump (106), an ink cartridge (107) and an ink delivery pipeline (108); the ink pump (106) is fixedly connected to the top of the ink cartridge (107), and the input end of the ink pump (106) is placed at the bottom of the ink cartridge (107); the output end of the ink pump (106) is fixedly connected to one end of the ink delivery pipeline (108); the other end of the ink delivery pipeline (108) is connected to the nozzle (104) via the valve (103); and the ink delivery pipeline (108) is connected to the nozzle (104) via the valve (103). 08) A charger (105) and a first electrode (101) are sleeved on a surface near one end of the nozzle (104); a printing platform (109) is arranged directly below the nozzle (104); the first electrode (101) is located above the nozzle (104) and the valve (103); the second electrode (102) is located below the printing platform (109); the first electrode (101) and the second electrode (102) are arranged in parallel; the positive projection of the first electrode (101) on the second electrode (102) is located inside the second electrode (102); and the first electrode (101) and the second electrode (102) form a printing electric field 1; The nozzle (104) and the valve (103) are located in a printing electric field 1 formed by the first electrode (101) and the second electrode (102), and the printing electric field 1 is used to control the ejection of ink and the backflow of ink in the nozzle (104); The valve (103) is located above the nozzle (104). When no printing operation is performed, the ink is controlled by the printing electric field to flow back into the ink delivery pipeline (108), and the valve (103) is closed.

2. The anti-clogging nozzle of an inkjet printer according to claim 1, characterized in that: The charger (105) is located at a portion of the ink delivery pipeline (108) that does not enter the printing electric field formed by the first electrode (101) and the second electrode (102).

3. The anti-clogging nozzle of an inkjet printer according to claim 1, characterized in that: The valve (103), the first electrode (101) and the second electrode (102) are all connected to a controller 1 via electric wires.

4. The anti-clogging nozzle of an inkjet printer according to claim 1, characterized in that: The anti-clogging nozzle also includes a moving component, which is used to control the movement of the nozzle (104) and the printing platform (109) in a plane and a parallel plane, and to control the distance between the nozzle (104) and the printing platform (109).

5. A printing method for preventing nozzle blockage of an inkjet printer according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: The charger (105) charges the ink in the ink delivery pipe (108); Step 2, opening the valve (103), allowing the charged ink to enter the printing electric field 1, and controlling the printing electric field 1 through the controller 1; Step 3: Under the action of the printing electric field 1, the ink is ejected from the nozzle (104) and falls on the substrate on the printing table (109) to perform printing; Step 4: After printing is completed, the printing electric field 1 is reversed, and the ink flows back to the ink delivery pipe (108) under the action of the electric field and reaches the top of the valve (103). The valve (103) is closed, and the printing electric field 1 and the controller 1 stop working.

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