Printing nozzle cleaning system and printer

Abstract

The embodiment of the invention provides a printing nozzle cleaning system and a printer, and relates to the technical field of printers. The printing nozzle cleaning system is used for cleaning a printing nozzle and comprises an ink stack and a pump machine connected with the ink stack. And the pump machine is used for pumping the ink away from the ink stack, or the pump machine conveys the ink into the ink stack. Convection is established to enable cleaning liquid to flow through a nozzle area repeatedly, shear force and local pressure difference are generated in the flowing process, and therefore solidified ink and tiny impurities attached to the surface of the nozzle and the inner wall of a hole channel are weakened and stripped. Compared with single-direction spray washing, the two-way flow state can achieve cleaning of the MEMS microfluid device in the nozzle of the printing spray head, and the cleaning uniformity and comprehensiveness are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printers, in particular to a printing head cleaning system and a printer. BACKGROUND

[0002] Household printers have become common office equipment in families and small offices due to their convenience and wide applicability. Currently, the ink used in general household printers is mostly dye-based aqueous ink, which can only act on paper. The stability of many industrial inks is much worse than that of ordinary dye-based aqueous ink for household printers, and it is more likely to cause clogging of the printing head. However, with the increasing demand for personalization and customization, small and micro businesses directly facing such needs have a great demand for desktop small printers. The market has also begun to see the emergence of household or desktop small printers using various industrial inks to achieve special industrial processes. In industrial applications, there are various processes, and there are also various and rich printed materials. Different processes and different printed carriers mean that different inks are needed. However, many industrial inks have much poorer stability than the stability of the aqueous dye ink used in household printers that can only print on paper, and are more likely to clog the head. In addition, small desktop printers using industrial inks are also prone to clogging and other problems due to their low-frequency use and the use of printing heads with poorer performance than industrial printer printing heads.

[0003] Currently, the common cleaning method for clogging of the printing head is to immerse the printing head in ink or special cleaning liquid, and then flush after the solidified ink is dissolved. However, this method has low cleaning efficiency, and it usually takes several hours or even longer to partially dissolve the solidified ink, and the cleaning effect is often unsatisfactory. Residual ink or impurities can continue to affect the normal operation of the printing head, leading to a decrease in printing quality or repeated clogging, increasing the difficulty and cost of user maintenance. SUMMARY

[0004] According to an embodiment of the present application, a printing head cleaning system is provided to solve the problems raised in the background.

[0005] In a first aspect of the present application, a printing head cleaning system is provided.

[0006] The printing head cleaning system comprises: a pump machine connected with an ink stack for cleaning a printing head, wherein the pump machine is used to pump ink out of the ink stack or the pump machine is used to deliver ink into the ink stack.

[0007] Preferably, the pump machine is a bidirectional pump.

[0008] Preferably, the first valve, the second valve, the third valve, the fourth valve, the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are further included, and the pump is a one-way pump; One end of the first pipeline is connected with the input end of the pump, and the other end of the first pipeline is connected with the ink stack, the first valve is installed on the first pipeline and located between the input end of the pump and the ink stack; One end of the second pipeline is connected with the output end of the pump, and the fourth valve is installed on the second pipeline and located at the output end of the pump; One end of the third pipeline is connected with the first pipeline and located between the first valve and the ink stack, the other end of the third pipeline is connected with the second pipeline and located between the output end of the pump and the fourth valve, and the second valve is installed on the third pipeline; One end of the fourth pipeline is connected with the first pipeline and located between the input end of the pump and the first valve, and the other end of the fourth pipeline is connected with the second pipeline and located between the fourth valve and the cleaning outlet, and the third valve is installed on the fourth pipeline.

[0009] Preferably, the first three-way electromagnetic valve, the second three-way electromagnetic valve, the fifth pipeline, the sixth pipeline, the seventh pipeline, the eighth pipeline, the ninth pipeline and the tenth pipeline are further included, and the pump is a one-way pump; One end of the fifth pipeline is connected with the input end of the pump, and the other end of the fifth pipeline is connected with the first three-way electromagnetic valve; One end of the sixth pipeline is connected with the output end of the pump, and the other end of the sixth pipeline is connected with the second three-way electromagnetic valve; The seventh pipeline is connected between the first three-way electromagnetic valve and the second three-way electromagnetic valve; The eighth pipeline is connected between the first three-way electromagnetic valve and the second three-way electromagnetic valve; The ninth pipeline is connected between the ink stack and the seventh pipeline; One end of the tenth pipeline is connected with the eighth pipeline and located between the first three-way electromagnetic valve and the second three-way electromagnetic valve.

[0010] Preferably, the eleventh pipeline, the twelfth pipeline, the thirteenth pipeline and the fourteenth pipeline are further included; One end of the eleventh pipeline is connected with the ink stack, the other end of the eleventh pipeline is connected with the twelfth pipeline and the thirteenth pipeline respectively, and the other ends of the twelfth pipeline and the thirteenth pipeline are connected with the fourteenth pipeline; The pump machine comprises a first pump machine and a second pump machine, both of which are one-way pumps; the first pump machine is arranged on the twelfth pipeline, and the second pump machine is arranged on the thirteenth pipeline.

[0011] Preferably, the printing head cleaning system further comprises a conveying pump connected to the ink inlet pipeline; the conveying pump is used to draw ink out of the printing head through the ink inlet pipeline, or the conveying pump is used to convey ink into the printing head through the cleaning pipeline.

[0012] Preferably, the ink stack comprises a first frame and a porous sponge arranged in the first frame; a cleaning cavity is formed between the porous sponge and the printing head; the ink stack further comprises a second frame, the first frame is slidingly arranged in the second frame, and an elastic assembly is arranged between the first frame and the second frame, used to provide the second frame with elastic force away from the first frame.

[0013] Preferably, the printing head is fixedly connected with a mounting body, the mounting body is connected with a driving assembly, and the driving assembly is used to drive the mounting body to carry out linear motion.

[0014] The driving assembly comprises a transmission belt, a first belt wheel, a second belt wheel and a motor; the transmission belt is fixedly connected with the mounting body, the transmission belt passes through the first belt wheel and the second belt wheel, and the output end of the motor is fixedly connected with the first belt wheel.

[0015] In the second aspect of the application, a printer is provided, which comprises the above printing head cleaning system.

[0016] The one or more technical solutions provided in the application have at least the following technical effects or advantages: The printing head cleaning system provided by the application can clean the internal flow channel and the nozzle of the printing head through the flow of ink through the printing head, the ejected ink can enter the ink stack, the first pump is started to draw the ink in the ink stack, after a unit time, the first pump is controlled to operate reversely to convey the ink to the ink stack through the cleaning pipeline, so that the ink and the ink ejected from the printing head realize convection, the liquid again washes the nozzle outlet surface of the printing head in the direction from bottom to top, and the ink forms convection in the MEMS microfluidic device inside the nozzle of the printing head. In the convection cleaning process, the inside and outside of the nozzle are both in a state of being repeatedly washed by the liquid flow, which can effectively remove the residual ink, impurities and other blocking particles in the inner wall of the nozzle channel, and carry away stubborn deposited substances attached to the nozzle of the printing head, thereby improving the thoroughness and reliability of the cleaning of the printing head.

[0017] Wherein, the establishment of the convection causes the cleaning liquid to repeatedly flow through the nozzle area, and shear force and local pressure difference are generated in the flow process, so as to weaken and peel off the solidified ink and small impurities attached to the nozzle surface and the inner wall of the hole. Compared with single-direction jet cleaning, the bidirectional flow state can realize cleaning of the MEMS microfluidic device inside the nozzle of the printing nozzle, improve cleaning uniformity and comprehensiveness. In addition, the liquid convection can also promote local temperature equalization and micro-bubble dispersion, which is beneficial to more sufficient replacement of residual liquid in the nozzle, fundamentally reduces the risk of nozzle blockage, and prolongs the service life of the printing nozzle.

[0018] It should be understood that the content described in the summary section is not intended to limit the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other features, advantages, and aspects of embodiments of the present application will become more apparent by describing in detail the following embodiments thereof with reference to the accompanying drawings, in which: Figure 1 A perspective structural schematic diagram of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 2 An exploded structural schematic diagram of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 3 A front view structural schematic diagram of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 4 A front view sectional structural schematic diagram of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 5 A perspective structural schematic diagram of an elastic assembly of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 6 A perspective structural schematic diagram of a first frame of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 7 A perspective structural schematic diagram of a nozzle assembly of a printing nozzle cleaning system according to embodiment one of the present application is shown; Figure 8 A perspective structural schematic diagram of a printer according to embodiment one of the present application is shown; Figure 9 A structural schematic diagram of a pump machine of a printing nozzle cleaning system according to embodiment two of the present application is shown; Figure 10 A structural schematic diagram of a pump machine of a printing nozzle cleaning system according to embodiment three of the present application is shown; Figure 11 Fig. 4 shows a structural schematic diagram of a pump station of a printing head cleaning system according to the fourth embodiment of the present application; Figure 12 Fig. 5 shows a structural schematic diagram of a printing head cleaning system according to the fourth embodiment of the present application, which further comprises a fifth valve and a sixth valve.

[0020] Legend of reference signs 1-ink stack, 11-first frame, 12-porous sponge, 13-cleaning cavity, 14-second frame, 2-printing head, 21-mounting body, 3-ink inlet pipeline, 4-cleaning pipeline, 5-pump, 51-first pump, 52-second pump, 6-delivery pump, 7-elastic assembly, 71-first branch arm, 72-second branch arm, 73-sliding block, 74-tension spring, 75-railway, 751-protrusion, 76-guide rod, 8-driving assembly, 81-transmission belt, 82-first pulley, 83-second pulley, 84-motor, 9-first valve, 9001-eleventh pipeline, 9002-twelfth pipeline, 9003-thirteenth pipeline, 9004-fourth pipeline, 9005-fifth valve, 9006-sixth valve, 901-first three-way electromagnetic valve, 902-second three-way electromagnetic valve, 903-fifth pipeline, 904-sixth pipeline, 905-seventh pipeline, 906-eighth pipeline, 907-ninth pipeline, 908-tenth pipeline, 91-second valve, 92-third valve, 93-fourth valve, 94-first pipeline, 95-second pipeline, 96-third pipeline, 97-fourth pipeline, 98-cleaning outlet, 10-printer body. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] In addition, the term “and / or” in this document merely describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character “ / ” generally represents an “or” relationship between the front and rear associated objects.

[0023] Embodiment one As Figures 1 to 7As shown, the printing nozzle cleaning system comprises: a printing nozzle 2 for cleaning, the printing nozzle 2 is connected with an ink inlet pipeline 3, further comprising an ink tank 1, a cleaning pipeline 4 and a first pump 5; the cleaning pipeline 4 is connected with the ink tank 1, the cleaning pipeline 4 is connected with the first pump 5, and the first pump 5 is used to draw the ink out of the ink tank 1 through the cleaning pipeline 4 or deliver the ink into the ink tank 1 through the cleaning pipeline 4.

[0024] When the printing nozzle 2 needs to be cleaned, the printing nozzle 2 is controlled to move above the ink tank 1, and then the printing nozzle 2 is controlled to spray ink, the ink is sprayed out of the printing nozzle 2, the ink flows through the printing nozzle 2, the internal flow channel of the printing nozzle 2 and the nozzle hole are cleaned, the sprayed ink enters the ink tank 1, the first pump 5 is started, the first pump 5 draws the ink in the ink tank 1 away, after a unit time, the first pump 5 is controlled to operate reversely, the ink is delivered into the ink tank 1 through the cleaning pipeline 4, and the ink and the ink sprayed out of the printing nozzle 2 realize convection, as shown in Figure 3 and Figure 4 As shown, the liquid again flushes the nozzle outlet surface of the printing nozzle 2 in the direction from bottom to top, and the ink forms convection in the MEMS microfluidic device inside the nozzle of the printing nozzle 2. During the convection cleaning process, the inside and outside of the nozzle are both in a state of being repeatedly flushed by the liquid flow, which can effectively remove the residual ink, impurities and other blocking particles in the nozzle channel wall, and carry away stubborn deposited substances attached to the printing nozzle 2, thereby improving the thoroughness and reliability of the nozzle cleaning. The first pump 5 is automatically stopped according to the control program after a certain time of operation (for example, continuous operation for several seconds), and a complete nozzle bidirectional cleaning cycle is completed.

[0025] Specifically, the establishment of convection causes the cleaning liquid to repeatedly flow through the nozzle area, and shear force and local pressure difference are generated in the flow process, so as to weaken and peel off the solidified ink and small impurities attached to the nozzle surface and the inner wall of the channel. Compared with single-direction spray cleaning, the bidirectional flow state can clean the MEMS microfluidic device inside the nozzle of the printing nozzle 2, improve the uniformity and comprehensiveness of cleaning. In addition, the liquid convection can also promote local temperature equalization and micro-bubble dispersion, which is beneficial to more sufficient replacement of residual liquid in the nozzle, fundamentally reduces the risk of nozzle blockage, and prolongs the service life of the printing nozzle 2.

[0026] Due to the small adsorption force of the print head 2 itself, the ink is sucked into the interior of the print head 2 by the adsorption force of the print head 2 itself, and then discharged by the nozzle of the print head 2. The flushing force on the inner wall of the nozzle and the MEMS microfluidic device of the nozzle is small, so the cleaning may not be complete. Therefore, in the present embodiment, the print head cleaning system further comprises a delivery pump 6 connected to the ink inlet pipeline 3. The delivery pump 6 is used to draw ink away from the print head 2 through the ink inlet pipeline 3, or the delivery pump 6 is used to deliver ink into the print head 2 through the cleaning pipeline 4.

[0027] By controlling the delivery pump 6 to deliver ink to the print head 2 and then discharge it from the print head 2, the setting of the delivery pump 6 can effectively increase the pressure of the ink, thereby increasing the flushing force of the ink on the inner wall of the nozzle of the print head 2 and the MEMS microfluidic device of the nozzle, and improving the cleaning effect.

[0028] It should be noted that the delivery pump 6 is a bidirectional pump. By controlling the delivery pump 6 to draw ink away from the print head 2, the ink is sucked into the interior of the print head 2 from the nozzle of the print head 2. In this way, reverse cleaning can be achieved, further improving the cleaning effect on the inner wall of the nozzle of the print head 2.

[0029] In the present embodiment, the ink stack 1 comprises a first frame 11 and a porous sponge 12 arranged in the first frame 11. The porous sponge 12 and the print head 2 form a cleaning cavity 13 therebetween.

[0030] The porous sponge 12 is in a block or sheet structure and is tightly embedded in the bottom or internal cavity of the first frame 11. The porous sponge 12 is made of a porous material with high liquid absorption and high filtration capacity. The material itself has good flexibility and resilience, which can adapt to the impact of liquid during inkjet, and effectively trap suspended particles in the liquid. When the print head assembly is positioned at the cleaning station, the nozzles face and approach the upper surface of the porous sponge 12, forming a limited space therebetween, which serves as a cleaning cavity 13 for containing the ink or cleaning liquid ejected from the nozzles and allowing the liquid to circulate in the nozzle area.

[0031] The cleaning pipeline 4 is arranged through the porous sponge 12, i.e. the pipeline extends from the lower part of the first frame 11 and passes through the interior of the porous sponge 12, so that the suction inlet of the pipeline is arranged below or at the side of the porous sponge 12. In this way, when the cleaning pipeline 4 draws liquid, it must pass through the filter layer of the porous sponge 12, so that all the liquid flowing into the pipeline is subjected to the pre-filtering action of the sponge, thereby effectively preventing impurities, fine fibers or deposited particles adsorbed in the sponge from being directly sucked into and re-entering the print head assembly, avoiding secondary pollution and blockage.

[0032] During the cleaning operation, first control the nozzle assembly to move to the cleaning position above the ink stack 1, at this time the nozzle assembly and the porous sponge 12 form a cleaning cavity 13. The control system drives the nozzle assembly to spray ink or cleaning liquid to the porous sponge 12 below, and the liquid is absorbed and temporarily stored by the porous sponge 12 after spraying, which plays a role in preliminary collection and buffering, avoiding liquid splashing and spreading. After a certain period of time, the control system starts the first pump 5, since the first pump 5 is connected to the cleaning pipeline 4 passing through the porous sponge 12, when it operates, it can suck out the liquid stored inside the sponge, and transport it back to the first frame 11 through the pipeline, realizing the reflux and recycling of the cleaning liquid.

[0033] In another optional embodiment, the cleaning pipeline 4 is arranged on the side of the porous sponge 12 away from the printing nozzle 2, that is, the suction inlet of the cleaning pipeline 4 is located in the lower or side area of the porous sponge 12, rather than directly below the printing nozzle 2. This layout makes the cleaning liquid or sprayed ink need to first go through the horizontal or vertical penetration process of the sponge body after entering the porous sponge 12, before reaching the suction inlet of the cleaning pipeline 4, thereby prolonging the residence path of the liquid inside the porous sponge 12.

[0034] In this embodiment, the ink stack 1 further comprises a second frame 14, the first frame 11 is slidingly installed in the second frame 14, and an elastic component 7 is arranged between the first frame 11 and the second frame 14, for providing elastic force to the second frame 14 away from the first frame 11.

[0035] The ink stack 1 further comprises a second frame 14, the first frame 11 is slidingly installed in the second frame 14, and an elastic component 7 is arranged between the first frame 11 and the second frame 14, for improving the tightness of the contact between the first frame 11 and the nozzle assembly.

[0036] When the nozzle assembly moves above the ink stack 1 and is aligned with the upper opening area of the first frame 11, the nozzle assembly is controlled to contact and press the upper edge of the first frame 11, at this time, due to the arrangement of the elastic component 7, the first frame 11 can slide downward relative to the second frame 14 under the action of force, thereby providing flexible buffering during contact, avoiding damage to the nozzle structure caused by rigid impact.

[0037] In this state, the first frame 11 and the printhead assembly form a closed or semi-closed space area, which is the cleaning chamber 13. The ink or cleaning liquid forms a turbulent flow or convection in the cleaning chamber 13, which cleans the inner wall of the nozzle of the printhead 2 and the MEMS device in the nozzle, mainly the cleaning of the MEMS device. Due to the continuous upward supporting force provided by the elastic assembly 7, the first frame 11 always maintains stable contact with the printhead assembly, thereby ensuring the continuity of the liquid path and the consistency of the cleaning effect during the cleaning process.

[0038] In the present embodiment, the elastic assembly 7 includes a first arm 71, a second arm 72, a slider 73, a tension spring 74, a slide 75, and a guide rod 76. One end of the first arm 71 is connected to the first frame 11 in a rotating manner, allowing the first arm 71 to rotate relative to the first frame 11 within a certain angle range; the other end of the first arm 71 is connected to the slide 75 in a sliding manner, and the slide 75 is provided on the second frame 14 to provide a controllable guide path for the first arm 71, thereby ensuring that the first arm 71 can realize a combined motion of rotation and linear movement when driven by an external force.

[0039] The guide rod 76 is fixedly installed on the first frame 11 and is used to limit the movement direction of the slider 73, ensuring that the slider 73 slides linearly along a predetermined path under the action of the tension of the tension spring 74. The slider 73 is slidably installed on the guide rod 76 and is connected to the tension spring 74. The tension spring 74 is in a spiral shape and is sleeved outside the guide rod 76, one end of which is fixed to the slider 73, and the other end is fixed to the first frame 11 or a stop position of the guide rod 76. When the slider 73 slides to the bottom of the guide rod 76 due to the elastic tension, the tension spring 74 is stretched and deformed, thereby generating a continuous return force.

[0040] One end of the second arm 72 is connected to the slider 73 through a sliding slot or sliding pivot structure, allowing it to slide relatively during the movement of the slider 73, and the other end is rotatably connected to the second frame 14 and can swing around the connection point under the driving action. The first arm 71 and the second arm 72 are connected in a rotating manner, allowing the two arms to form an included angle around the connection point and to rotate in linkage under the force state.

[0041] When the nozzle assembly enters the cleaning station and is above the ink stack 1, the elastic assembly 7 starts to work. The tension spring 74 provides a pulling force to the sliding block 73 due to its restoring property, which drives the sliding block 73 to slide down along the guide rod 76. Since the sliding block 73 is slidingly connected to the second supporting arm 72, the displacement of the sliding block 73 drives the second supporting arm 72 to rotate around the rotating connection between the second supporting arm 72 and the second frame 14. Meanwhile, the movement of the second supporting arm 72 further drives the first supporting arm 71. Since one end of the first supporting arm 71 is embedded in the sliding channel 75 and is constrained by the sliding channel 75 during the sliding process, the first supporting arm 71 is formed to have a limited rotation and linear sliding, thereby driving the first frame 11 connected to the other end of the first supporting arm 71 to move upward.

[0042] The included angle between the first supporting arm 71 and the second supporting arm 72 is continuously changed, and the relative movement state is presented. The first frame 11 is gradually lifted, and the upper edge of the first frame 11 finally realizes stable contact with the nozzle surface of the nozzle assembly, thereby constructing a closed or semi-closed cleaning cavity 13, and completing the automatic alignment and flexible fitting process between the nozzle assembly and the first frame 11.

[0043] In the embodiment, the sliding channel 75 is provided with a limiting protrusion 751. The limiting protrusion 751 is configured to limit the sliding of the first supporting arm 71 in the sliding channel 75, thereby ensuring the movement stroke of the first supporting arm 71.

[0044] In the embodiment, the first frame 11 is provided with a guide portion 111 in an inclined state. The guide portion 111 is provided with a curved limiting portion 112. The printing nozzle 2 is provided with a contact rod 22, and the contact rod 22 is provided with a roller 221 which can contact the guide portion 111.

[0045] During the linear reciprocating movement of the nozzle assembly in use, when the nozzle assembly needs to be cleaned, the nozzle assembly is driven to move linearly and preferentially contacts the guide portion 111. At this time, under the action of the guide portion 111, the first frame 11 moves downward, and the sliding block 73 slides on the guide rod 76. The tension spring 74 is stretched and stores energy. When the nozzle assembly moves to the rear, the first supporting arm 71 and the second supporting arm 72 move under the action of the tension spring 74. The second supporting arm 72 drives the sliding block 73 to slide on the guide rod 76, and the first supporting arm 71 slides in the sliding channel 75, thereby driving the first frame 11 to move upward, so as to realize the close contact between the first frame 11 and the nozzle assembly. When the nozzle assembly moves towards the ink stack 1, the roller 221 on the contact rod 22 preferentially contacts the guide portion 111. Since the guide portion 111 is designed to be inclined, the first frame 11 is driven to move downward. When the contact rod 22 moves to the limiting portion 112, the first frame 11 moves upward by a certain stroke, thereby realizing the close contact between the first frame 11 and the nozzle assembly.

[0046] In this embodiment, an ink sac 25 is connected to the end of the ink inlet pipe 3 away from the print head 2. The ink sac 25 is used to store ink. During printing operations or cleaning of the print head 2, the ink in the ink sac 25 is delivered to the print head 2 by the delivery pump 6 through the ink inlet pipe.

[0047] In this embodiment, the print head 2 is fixedly connected to a mounting body 21, and the mounting body 21 is connected to a drive assembly 8. The drive assembly 8 is used to drive the mounting body 21 to carry the print head 2 in linear motion to perform printing.

[0048] The drive assembly 8 includes a transmission belt 81, a first pulley 82, a second pulley 83, and a motor 84. The transmission belt 81 is fixedly connected to the mounting body 21 and passes around the first pulley 82 and the second pulley 83. The output end of the motor 84 is fixedly connected to the first pulley 82. When the motor 84 is started, its output end drives the first pulley 82 to rotate, which in turn drives the transmission belt 81. The transmission belt 81 then drives the mounting body 21 to move linearly, while the second pulley 83 rotates along with the transmission belt 81.

[0049] like Figure 8 As shown, in a second aspect of the present invention, a printer is provided; The printer includes the aforementioned printhead cleaning system, which is installed inside the printer body 10.

[0050] Example 2 like Figure 9 As shown, in this embodiment, the printhead cleaning system further includes a first valve 90, a second valve 91, a third valve 92, a fourth valve 93, a first pipeline 94, a second pipeline 95, a third pipeline 96, and a fourth pipeline 97, and the pump 5 is a unidirectional pump; Wherein: one end of the first pipeline 94 is connected to the input end of the pump 5, the other end of the first pipeline 94 is connected to the ink stack 1, and the first valve 90 is installed on the first pipeline 94 and located between the input end of the pump 5 and the ink stack 1. One end of the second pipeline 95 is connected to the output end of the pump 5, and the fourth valve 93 is installed on the second pipeline 95 and located at the output end of the pump 5; One end of the third pipe 96 is connected to the first pipe 94 and is located between the first valve 90 and the ink stack 1. The other end of the third pipe 96 is connected to the second pipe 95 and is located between the output end of the pump 5 and the fourth valve 93. The second valve 91 is installed on the third pipe 96. One end of the fourth pipe 97 is connected to the first pipe 94 and is located between the input end of the pump 5 and the first valve 90. The other end of the fourth pipe 97 is connected to the second pipe 95 and is located between the fourth valve 93 and the cleaning outlet 98. The third valve 92 is installed on the fourth pipe 97.

[0051] When it is necessary to drain the ink from ink stack 1, start pump 5 and close the second valve 91 and the third valve 92, while opening the first valve 90 and the fourth valve 93. Pump 5 draws the ink from ink stack 1 into the first pipeline 94 through cleaning pipeline 4, then into pump 5 through the first valve 90, then into the second pipeline 95, and finally out through the fourth valve 93. When backwashing is required, open the second valve 91 and the third valve 92, and close the first valve 90 and the fourth valve 93. Pump 5 draws the ink into the pump 5 through the second pipeline 95, then into pump 5 through the fourth pipeline 97 and the third valve 92, then into the pump 5, then into the third pipeline 96, then into the first pipeline 94 through the second valve 91, then into cleaning pipeline 4, and finally into ink stack 1.

[0052] Example 3 like Figure 10 As shown, in this embodiment, the printhead cleaning system further includes a first three-way solenoid valve 901, a second three-way solenoid valve 902, a fifth pipeline 903, a sixth pipeline 904, a seventh pipeline 905, an eighth pipeline 906, a ninth pipeline 907, and a tenth pipeline 908, and the pump 5 is a one-way pump; Wherein: one end of the fifth pipeline 903 is connected to the input end of the pump 5, and the other end of the fifth pipeline 903 is connected to the first three-way solenoid valve 901; One end of the sixth pipeline 904 is connected to the output end of the pump 5, and the other end of the sixth pipeline 904 is connected to the second three-way solenoid valve 902; The seventh pipeline 905 is connected between the first three-way solenoid valve 901 and the second three-way solenoid valve 902. The eighth pipeline 906 is connected between the first three-way solenoid valve 901 and the second three-way solenoid valve 902; The ninth pipe 907 is connected between the ink stack 1 and the seventh pipe 905; One end of the tenth pipeline 908 is connected to the eighth pipeline 906 and is located between the first three-way solenoid valve 901 and the second three-way solenoid valve 902.

[0053] When it is necessary to drain the ink from ink stack 1, start pump 5 and control the first three-way solenoid valve 901 to connect the ninth pipe 907 and the fifth pipe 903; control the second three-way solenoid valve 902 to connect the sixth pipe 904 and the eighth pipe 906. Pump 5 draws the ink from ink stack 1 into the cleaning pipe 4, the ninth pipe 907, and the first three-way solenoid valve 901, and then delivers the ink to the sixth pipe 904, the second three-way solenoid valve 902, the eighth pipe 906, and the tenth pipe 908 for discharge. When it is necessary to deliver ink to ink stack 1, control the first three-way solenoid valve 901 to connect the fifth pipe 903 and the eighth pipe 906; control the second three-way solenoid valve 902 to connect the sixth pipe 904 and the seventh pipe 905. Pump 5 draws ink in through the tenth pipe 908, passes through the eighth pipe 906, the first three-way solenoid valve 901 and the fifth pipe 903 into pump 5, and then enters the ink stack 1 through the sixth pipe 904, the second three-way solenoid valve 902, the seventh pipe 905, the ninth pipe 907 and the cleaning pipe 4.

[0054] Example 4 like Figure 11 As shown, in this embodiment, the printhead cleaning system further includes an eleventh pipe 9001, a twelfth pipe 9002, a thirteenth pipe 9003, and a fourteenth pipe 9004; One end of the eleventh pipe 9001 is connected to the ink stack 1; the other end of the eleventh pipe 9001 is connected to the twelfth pipe 9002 and the thirteenth pipe 9003 respectively; the other ends of the twelfth pipe 9002 and the thirteenth pipe 9003 are both connected to the fourteenth pipe 9004. The pump 5 includes a first pump 51 and a second pump 52, both of which are unidirectional pumps; the first pump 51 is installed on the twelfth pipeline 9002, and the second pump 52 is installed on the thirteenth pipeline 9003.

[0055] When ink needs to be drained from ink stack 1, the first pump 51 is activated. Ink enters the first pump 51 through cleaning line 4, eleventh line 9001, and twelfth line 9002, then flows through the first pump 51 into the fourteenth line 9004, and is discharged from the fourteenth line 9004. When ink needs to be delivered to ink stack 1, the second pump 52 is activated. Ink flows through the fourteenth line 9004 into the thirteenth line 9003 and into the second pump 52, then is delivered by the second pump 52 to the eleventh line 9001, and from the eleventh line 9001 into cleaning line 4 and ink stack 1.

[0056] like Figure 12As shown, for part of the one-way pump, the shutoff function cannot be realized when not working, and therefore in the embodiment, the twelfth pipeline 9002 is provided with a fifth valve 9005, and the thirteenth pipeline 9003 is provided with a sixth valve 9006.

[0057] The shutoff is realized by controlling the fifth valve 9005 and the sixth valve 9006, and the function of bidirectional transmission of ink is ensured.

[0058] It should be noted that in the above embodiment, for the cleaning of the printing head 2, the ink can be replaced with a cleaning liquid or other liquid that can achieve the cleaning and flushing effect.

[0059] The above specific embodiments do not constitute a limitation on the protection scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A print head washing system for washing a print head (2) comprising an ink stack (1), characterized in that, Further comprising a pump (5) connected with the ink tank (1); the pump (5) is used to pump the ink out of the ink tank (1) or the pump (5) is used to deliver the ink into the ink tank (1).

2. The print head washing system of claim 1, wherein, The pump (5) is a bidirectional pump.

3. The print head washing system of claim 1, wherein, Further comprising a first valve (90), a second valve (91), a third valve (92), a fourth valve (93), a first pipeline (94), a second pipeline (95), a third pipeline (96) and a fourth pipeline (97), the pump (5) is a unidirectional pump; Wherein: one end of the first pipeline (94) is connected with the input end of the pump (5), the other end of the first pipeline (94) is connected with the ink tank (1), the first valve (90) is installed on the first pipeline (94) and located between the input end of the pump (5) and the ink tank (1); One end of the second pipeline (95) is connected with the output end of the pump (5), the fourth valve (93) is installed on the second pipeline (95) and located at the output end of the pump (5); One end of the third pipeline (96) is connected with the first pipeline (94) and located between the first valve (90) and the ink tank (1), the other end of the third pipeline (96) is connected with the second pipeline (95) and located between the output end of the pump (5) and the fourth valve (93), the second valve (91) is installed on the third pipeline (96); One end of the fourth pipeline (97) is connected with the first pipeline (94) and located between the input end of the pump (5) and the first valve (90), the other end of the fourth pipeline (97) is connected with the second pipeline (95) and located between the fourth valve (93) and a cleaning outlet (98), the third valve (92) is installed on the fourth pipeline (97).

4. The print head washing system of claim 1, wherein, Further comprising a first three-way electromagnetic valve (901), a second three-way electromagnetic valve (902), a fifth pipeline (903), a sixth pipeline (904), a seventh pipeline (905), an eighth pipeline (906), a ninth pipeline (907) and a tenth pipeline (908), the pump (5) is a unidirectional pump; Wherein: one end of the fifth pipeline (903) is connected with the input end of the pump (5), the other end of the fifth pipeline (903) is connected with the first three-way electromagnetic valve (901); One end of the sixth pipeline (904) is connected with the output end of the pump (5), the other end of the sixth pipeline (904) is connected with the second three-way electromagnetic valve (902); The seventh pipeline (905) is connected between the first three-way electromagnetic valve (901) and the second three-way electromagnetic valve (902); The eighth pipeline (906) is connected between the first three-way electromagnetic valve (901) and the second three-way electromagnetic valve (902); The ninth pipeline (907) is connected between the ink tank (1) and the seventh pipeline (905); The tenth pipeline (908) is connected between the second three-way electromagnetic valve (902) and the cleaning outlet (98). One end of the tenth pipeline (908) is connected with the eighth pipeline (906) and located between the first three-way electromagnetic valve (901) and the second three-way electromagnetic valve (902).

5. The print head washing system of claim 1, wherein, Further comprising an eleventh pipeline (9001), a twelfth pipeline (9002), a thirteenth pipeline (9003) and a fourteenth pipeline (9004); One end of the eleventh pipeline (9001) is connected with the ink stack (1); the other end of the eleventh pipeline (9001) is connected with the twelfth pipeline (9002) and the thirteenth pipeline (9003) respectively; the other end of the twelfth pipeline (9002) and the thirteenth pipeline (9003) is connected with the fourteenth pipeline (9004); The pump machine (5) comprises a first pump machine (51) and a second pump machine (52), and the first pump machine (51) and the second pump machine (52) are both one-way pumps; the first pump machine (51) is arranged on the twelfth pipeline (9002), and the second pump machine (52) is arranged on the thirteenth pipeline (9003).

6. The print head washing system of claim 5, wherein, A fifth valve (9005) is arranged on the twelfth pipeline (9002), and a sixth valve (9006) is arranged on the thirteenth pipeline (9003).

7. The print head washing system of claim 1, wherein Further comprising a conveying pump (6) connected with the ink inlet pipeline (3); the conveying pump (6) is used for drawing ink out of the printing nozzle (2) through the ink inlet pipeline (3), or the conveying pump (6) is used for conveying ink into the printing nozzle (2) through the ink inlet pipeline (3).

8. The print head washing system of claim 1, wherein, The ink stack (1) comprises a first frame body (11) and a porous sponge (12) arranged in the first frame body (11); a cleaning cavity (13) is formed between the porous sponge (12) and the printing nozzle (2); The ink stack (1) further comprises a second frame body (14), the first frame body (11) is slidingly arranged in the second frame body (14), and an elastic assembly (7) is arranged between the first frame body (11) and the second frame body (14) to provide elastic force for the second frame body (14) to move away from the first frame body (11).

9. The print head washing system of claim 1, wherein, The printing nozzle (2) is fixedly connected with a mounting body (21), the mounting body (21) is connected with a driving assembly (8), and the driving assembly (8) is used for driving the mounting body (21) to carry out linear motion of the printing nozzle (2). The driving assembly (8) comprises a transmission belt (81), a first belt wheel (82), a second belt wheel (83) and a motor (84); the transmission belt (81) is fixedly connected with the mounting body (21), the transmission belt (81) passes through the first belt wheel (82) and the second belt wheel (83), and the output end of the motor (84) is fixedly connected with the first belt wheel (82).

10. A printer characterized by comprising: The printer comprises the printing nozzle cleaning system according to any one of claims 1 to 9.

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