An ink path system and a false alarm prevention method for inking

Abstract

The application discloses an ink path system and an ink feeding false alarm prevention method thereof. The ink feeding false alarm prevention method of the ink path system comprises the following steps: after starting ink feeding, a real-time flow value of an ink circulation loop in the ink path system is acquired; a change rate of the real-time flow value within a dynamic suppression time is detected according to the real-time flow value; and a blockage state of the ink path system is judged according to the real-time flow value and the change rate of the real-time flow value. The technical scheme provided in the embodiment of the application improves the judgment effect on the blockage condition.

Description

Technical Field

[0001] This invention relates to the field of inkjet printing technology, and in particular to an ink path system and a method for preventing false alarms during ink filling. Background Technology

[0002] In photovoltaic and semiconductor manufacturing processes, insulating inks, conductive inks, or other functional inks with fluid properties are required. During the initial ink filling of the ink system or when the ink reservoir is emptied and repressurized, the diaphragm pump experiences a "dry pumping overspeed" phenomenon due to the smaller fluid volume and larger air volume within the reservoir, resulting in a sudden spike in the measured flow rate. This is a normal transient phenomenon during the initial pressurization phase. However, traditional detection methods frequently trigger false alarms indicating blockages, offering poor diagnostic accuracy. Summary of the Invention

[0003] This invention provides an ink path system and a method for preventing false alarms during ink filling, in order to solve the problem of poor judgment of blockage.

[0004] According to one aspect of the present invention, a method for preventing false alarms in ink filling of an ink path system is provided, comprising: After starting the ink filling process, obtain the real-time flow rate of the ink circulation loop in the ink path system; Based on the real-time flow value, detect the rate of change of the real-time flow value within the dynamic suppression time; The blockage status of the ink path system is determined based on the real-time flow rate and the rate of change of the real-time flow rate.

[0005] Optionally, determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate includes: If the rate of change of the real-time flow value is less than the flow change threshold, and the real-time flow value drops below the alarm threshold within the dynamic suppression time, it is determined that the ink path system is not blocked; the flow change threshold is less than 0.

[0006] Optionally, determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate further includes: If the rate of change of the real-time flow value is less than the flow change threshold, and the real-time flow value does not decrease to below the alarm threshold within the dynamic suppression time, then the detection of the real-time flow value continues. If the real-time flow rate drops below the alarm threshold during the extended monitoring period, it is determined that the ink path system is not blocked.

[0007] Optionally, determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate further includes: If the rate of change of the real-time flow value is greater than or equal to the flow change threshold and the duration exceeds a preset time, it is determined that the ink path system is blocked; the preset time is less than the dynamic suppression time.

[0008] Optionally, detecting the rate of change of the real-time flow value within the dynamic suppression time, based on the real-time flow value, includes: The rate of change of the real-time flow value was detected multiple times at different times within the dynamic suppression time. The rate of change of the real-time flow value during the dynamic suppression time is calculated based on the average rate of change of each of the real-time flow values.

[0009] Optionally, the step of detecting the rate of change of the real-time flow value multiple times at different times within the dynamic suppression time includes: At least three sampling points are set within the dynamic suppression time; Detect the rate of change of real-time flow values ​​at each sampling point.

[0010] Optionally, after inking begins and before acquiring the real-time flow rate value of the ink circulation loop in the ink path system, the method further includes: Obtain the liquid level height of the ink storage cavity in the ink path system; When the liquid level is less than the low liquid level threshold, the ink system is determined to be in the initial ink filling state.

[0011] According to another aspect of the present invention, an ink path system is provided, comprising: a diaphragm pump, an ink storage chamber, an inkjet printhead, and a controller, wherein the ink storage chamber and the diaphragm pump form an ink circulation loop; the inkjet printhead is connected to the ink storage chamber, or the inkjet printhead is connected to the output end of the diaphragm pump; the controller is connected to the diaphragm pump and is used to execute the ink filling and false alarm prevention method of the ink path system according to any embodiment of the present invention.

[0012] Optionally, the ink storage cavity includes: an ink tank; the input end of the ink tank is used to connect to an ink cartridge, the output end of the ink tank is connected to the input end of the diaphragm pump, and the output end of the diaphragm pump is connected to the inkjet printhead; Alternatively, the ink storage cavity includes an ink return cavity and an ink inlet cavity; the input end of the ink return cavity is used to connect to an ink cartridge, the output end of the ink return cavity is connected to the input end of the diaphragm pump, the output end of the diaphragm pump is connected to the input end of the ink inlet cavity, and the output end of the ink inlet cavity is connected to the inkjet printhead.

[0013] Optionally, the ink path system further includes: a liquid level sensor connected to the controller; The liquid level sensor is disposed on the inner side wall of the ink tank, or on the inner side wall of the ink return chamber.

[0014] The technical solution provided by this invention avoids misjudging blockages during the initial ink filling stage of the ink system by setting a dynamic suppression time and temporarily allowing excessively high real-time flow rates within this time. Furthermore, it determines the true blockage status by detecting the real-time flow rate and its rate of change. Therefore, this invention can accurately identify true high-flow-rate blockage faults, significantly reducing the ineffective work of maintenance engineers during shift changes and ink replacements, effectively preventing damage to the inkjet printhead caused by prolonged high-pressure operation, and preventing contamination during ink replacement.

[0015] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an ink path system provided according to an embodiment of the present invention; Figure 2 This is a schematic diagram of another ink path system provided according to an embodiment of the present invention; Figure 3 This is a flowchart of an ink path system ink filling false alarm prevention method provided by an embodiment of the present invention; Figure 4 This is a flowchart of another ink path system ink filling false alarm prevention method provided by an embodiment of the present invention; Figure 5 This is a flow monitoring diagram of an ink path system provided according to an embodiment of the present invention; Figure 6 This is a flowchart of another ink path system ink filling false alarm prevention method provided by an embodiment of the present invention; Figure 7 This is a flowchart of another ink path system ink filling false alarm prevention method provided by an embodiment of the present invention; Figure 8 This is a flowchart of another ink path system ink filling and false alarm prevention method provided by an embodiment of the present invention. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0019] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0020] This invention provides a method for preventing false alarms during ink filling in an ink system, applicable to ink systems. Figure 1 This is a schematic diagram of an ink path system provided in an embodiment of the present invention. (Reference) Figure 1 The ink path system includes: a diaphragm pump 1, an ink storage chamber 2, an inkjet printhead 3, and a controller 4. The ink storage chamber 2 and the diaphragm pump 1 form an ink circulation loop. The inkjet printhead 3 is connected to the ink storage chamber 2, or the inkjet printhead 3 is connected to the output end of the diaphragm pump 1. The controller 4 is connected to the diaphragm pump 1 and is used to execute the ink filling and false alarm prevention method of the ink path system provided in any embodiment of the present invention.

[0021] Optionally, the ink storage cavity 2 includes an ink tank 21; the input end of the ink tank 21 is used to connect to the ink cartridge 6, the output end of the ink tank 21 is connected to the input end of the diaphragm pump 1, and the output end of the diaphragm pump 1 is connected to the inkjet printhead 3.

[0022] in, Figure 1 An exemplary ink storage chamber 2 with only one ink reservoir 21 is shown. An ink cartridge 6 stores and supplies ink to the ink reservoir 21. A diaphragm pump 1 enables unidirectional ink flow and ejects ink through the inkjet printhead 3. When the ink system is performing inkjet printing normally, the ink in the ink reservoir 21 is ejected through the inkjet printhead 3 after passing through the diaphragm pump 1.

[0023] Figure 2 This is a schematic diagram of another ink path system provided in an embodiment of the present invention. (Reference) Figure 2The ink storage cavity includes an ink return cavity 22 and an ink inlet cavity 23. The input end of the ink return cavity 22 is used to connect to the ink cartridge 6, and the output end of the ink return cavity 22 is connected to the input end of the diaphragm pump 1. The output end of the diaphragm pump 1 is connected to the input end of the ink inlet cavity 23. The output end of the ink inlet cavity 23 is connected to the inkjet printhead 3.

[0024] in, Figure 2 An exemplary ink storage chamber 2 with dual ink chambers is shown, having an ink return chamber 22 and an ink inlet chamber 23. Ink in the ink cartridge 6 can flow into the ink inlet chamber 23 through the ink return chamber 22 and the diaphragm pump 1, and the ink in the ink inlet chamber 23 can be ejected through the inkjet printhead 3.

[0025] For example, the ink can be a functional ink with similar fluid properties that is widely applicable in the photovoltaic and semiconductor manufacturing fields. Examples include: battery separator ink, battery front separator ink, battery back separator ink, metallized conductive ink (silver paste ink, copper paste ink), perovskite precursor ink for perovskite solar cells, etc.

[0026] Combination Figure 1 and Figure 2 Optionally, the ink path system also includes a liquid level sensor (not shown in the figure), which is connected to the controller 4. The liquid level sensor is located on the inner side wall of the ink tank 21, or on the inner side wall of the ink return chamber 22.

[0027] The liquid level sensor is used to detect the ink level inside the ink tank 21 or the ink return chamber 22. When the ink level is low, it indicates that the ink system is in the initial ink filling or re-pressurization stage. At this time, there is less ink and more air inside the ink tank 21 or the ink return chamber 22. When the diaphragm pump 1 transfers ink, it is easy to extract too much air, which will cause the reading to be falsely high, resulting in a surge in the measured flow rate. At this time, the controller 4 will judge that the filter is clogged and cause an erroneous shutdown. Therefore, the following ink filling anti-false alarm method of the ink system needs to be implemented for the initial ink filling or re-pressurization stage of the ink system.

[0028] Figure 3 A flowchart illustrating a method for preventing false alarms during ink application in an ink path system, provided as an embodiment of the present invention. (Reference) Figure 3 The ink path system's methods for preventing false alarms during ink filling include: S110. After starting the ink filling process, obtain the real-time flow rate value of the ink circulation loop in the ink path system.

[0029] When inking begins, the ink cartridge supplies ink to the ink reservoir, and the ink flows unidirectionally via a diaphragm pump. During the initial inking phase of the ink path system, the presence of a large amount of gas in the ink reservoir may cause the real-time flow rate reading to spike.

[0030] For example, the real-time flow rate of the ink circulation loop can be the flow rate at the input of the diaphragm pump or the flow rate of the pipe connecting the diaphragm pump and the ink storage chamber.

[0031] S120. Based on the real-time flow rate, detect the rate of change of the real-time flow rate within the dynamic suppression time.

[0032] To avoid artificially high real-time flow rates during the initial ink loading phase of the ink path system, a dynamic suppression time can be set. If the real-time flow rate exceeds the alarm threshold during this dynamic suppression time, it will not be considered a fault condition for the time being, and the rate of change of the real-time flow rate will continue to be monitored. Based on the rate of change of the real-time flow rate, it will be further determined whether it is a true blockage.

[0033] S130. Determine the blockage status of the ink path system based on the real-time flow rate and the rate of change of the real-time flow rate.

[0034] During the initial ink filling stage of the ink system, as the system continues to operate, the ink inside the ink storage chamber gradually increases while the gas gradually decreases. Therefore, if the ink system is not clogged, the real-time flow rate should gradually decrease during the dynamic suppression time, and the rate of change of the real-time flow rate should be less than 0. At this point, it can be determined that an excessively high real-time flow rate is normal during the initial ink filling stage of the ink system, and no clog has occurred.

[0035] If the ink path system becomes clogged, there will always be a large amount of gas in the ink circulation loop. During the dynamic suppression time, the real-time flow rate will remain high, and the rate of change of the real-time flow rate will also remain basically unchanged. At this time, it can be determined that the excessively high real-time flow rate indicates that the ink path system is clogged, and a fault report or alarm can be triggered.

[0036] The technical solution provided by this invention avoids misjudging blockages during the initial ink filling stage of the ink system by setting a dynamic suppression time and temporarily allowing excessively high real-time flow rates within this time. Furthermore, it determines the true blockage status by detecting the real-time flow rate and its rate of change. Therefore, this invention can accurately identify true high-flow-rate blockage faults, significantly reducing the ineffective work of maintenance engineers during shift changes and ink replacements, effectively preventing damage to the inkjet printhead caused by prolonged high-pressure operation, and preventing contamination during ink replacement.

[0037] Figure 4 A flowchart of another ink path system ink filling and false alarm prevention method provided in an embodiment of the present invention. Figure 5 This is a flow monitoring diagram of an ink path system provided in an embodiment of the present invention. Combined with... Figure 4 and Figure 5Based on the above embodiments, optionally, S130, determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate includes: S131. When the rate of change of the real-time flow value is less than the flow change threshold, and the real-time flow value drops below the alarm threshold within the dynamic suppression time, it is determined that the ink system is not blocked; the flow change threshold is less than 0.

[0038] For example, the dynamic suppression time can be set to a value within 20-30 seconds, and the flow rate change threshold can be -0.1 (unit: mL / min / s). Figure 5 An example is shown with a dynamic suppression time of 25 seconds and an alarm threshold of 9 (mL / min).

[0039] According to reference curve 12, during the dynamic suppression time, the real-time flow rate gradually decreased and fell below the alarm threshold, and the rate of change of the real-time flow rate was also small. Therefore, the reason for the excessively high real-time flow rate is a temporary abnormality of the ink path system during the initial ink filling stage, rather than a real blockage.

[0040] The technical solution provided by the embodiments of the present invention achieves a true judgment of the blockage status by detecting the real-time flow value and the rate of change of the real-time flow value, and combining the flow change threshold and the alarm threshold. It does not rely on detection equipment to distinguish between gas and liquid, but judges whether it is a normal pressure build-up transient by real-time flow value and rate of change, thus bypassing the technical difficulty of gas-liquid differentiation.

[0041] Continue to refer to Figure 5 Based on the above embodiments, optionally, S130, judging the blockage status of the ink system according to the real-time flow value and the rate of change of the real-time flow value, further includes: when the rate of change of the real-time flow value is greater than or equal to the flow change threshold and the duration exceeds a preset time, it is judged that the ink system is blocked; the preset time is less than the dynamic suppression time.

[0042] When the ink path system becomes clogged, there is less ink in the ink circulation loop, and the ink circulation loop is mainly composed of gas. Therefore, the real-time flow rate remains high.

[0043] For example, the preset time can be 5 seconds. If the real-time flow rate is consistently greater than the alarm threshold and remains above it for 5 seconds within the dynamic suppression time, it indicates that the ink path system is blocked.

[0044] Reference curve 11: During the dynamic suppression time, the real-time flow value tends to be stable and is always greater than the alarm threshold. The rate of change of the real-time flow value is about 0. This is the curve when a real blockage has occurred. At this time, the fault can be reported.

[0045] Figure 6 A flowchart illustrating another ink path system's method for preventing false alarms in an embodiment of the present invention. (See reference) Figure 6 Based on the above embodiments, optionally, S130, determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate further includes: S132. When the rate of change of the real-time flow value is less than the flow change threshold, and the real-time flow value does not decrease to below the alarm threshold within the dynamic suppression time, the detection of the real-time flow value continues.

[0046] If the rate of change of the real-time flow rate is less than the flow rate change threshold within the dynamic suppression time, it indicates that the real-time flow rate is consistently decreasing. If the real-time flow rate does not decrease below the alarm threshold within the dynamic suppression time, there may be two possibilities: either the ink path system is partially blocked, or the ink viscosity is high and has not yet returned to normal flow, meaning there is no blockage. Therefore, an extended monitoring time needs to be added at this stage to continue judging the real-time flow rate.

[0047] S133. If the real-time flow rate drops below the alarm threshold within the extended monitoring period, it is determined that the ink path system is not blocked.

[0048] For example, the extended monitoring time can be 10 seconds. If the real-time flow rate continuously decreases and falls below the alarm threshold within the extended monitoring time, it indicates that the ink path system is not blocked. If it does not decrease below the alarm threshold, it indicates that the ink path system is partially blocked.

[0049] The technical solution provided by this invention adds an extended monitoring time after the dynamic suppression time, which is equivalent to setting a detection margin. This enables secondary detection of the real-time flow value, further ensuring the accurate judgment of the blockage situation and improving the judgment effect of the blockage situation.

[0050] Figure 7 A flowchart illustrating another ink path system's method for preventing false alarms in an embodiment of the present invention. (See reference) Figure 7 Based on the above embodiments, optionally, S120, detecting the rate of change of the real-time flow value within the dynamic suppression time according to the real-time flow value includes: S121. Detect the rate of change of real-time flow value multiple times at different times within the dynamic suppression time.

[0051] Optionally, during the dynamic suppression period, the rate of change of the real-time flow value is detected multiple times, including setting at least three sampling points during the dynamic suppression period and detecting the rate of change of the real-time flow value at each sampling point.

[0052] If only the rate of change of real-time flow value is detected in a single instance, misjudgment may occur due to a single fluctuation. Therefore, multiple sampling points can be set up, and the rate of change of real-time flow value at each sampling point can be used to reflect the rate of change of real-time flow value.

[0053] For example, the sampling points can be set to three. The rate of change of the real-time flow value at the first sampling point is the rate of change of the real-time flow value between the first sampling point and time 0. The rate of change of the real-time flow value at the second sampling point is the rate of change of the real-time flow value between the second sampling point and the first sampling point. The rate of change of the real-time flow value at the third sampling point is the rate of change of the real-time flow value between the third sampling point and the second sampling point.

[0054] In other implementations, five or more sampling points may be set, which is not limited here.

[0055] S122. Calculate the rate of change of the real-time flow value within the dynamic suppression time based on the average rate of change of each real-time flow value.

[0056] When multiple real-time traffic values ​​change rates are obtained, the average change rate of each real-time traffic value can be calculated to obtain the change rate of the real-time traffic value over the entire dynamic suppression time.

[0057] This invention improves the accuracy of calculating the rate of change of real-time flow values ​​by setting multiple sampling points, thus ensuring the effectiveness of judging the blockage situation.

[0058] Figure 8 A flowchart illustrating another ink path system's method for preventing false alarms in an embodiment of the present invention. (See reference) Figure 8 Based on the above embodiments, optionally, S110, before obtaining the real-time flow value of the ink circulation loop in the ink path system after starting ink filling, further includes: S140. Obtain the liquid level height of the ink storage cavity in the ink path system.

[0059] S150. When the liquid level is less than the low liquid level threshold, the ink system is determined to be in the initial ink filling state.

[0060] When the ink level is low, it can be determined that the ink path system is in the initial ink filling state. At this time, there is less ink and more air inside the ink storage chamber. When the diaphragm pump transfers ink, it is easy to extract more air, which will cause the reading to be falsely high, and then cause the measured flow rate to soar. At this time, it is necessary to establish a dynamic suppression time and detect the real flow rate and its rate of change to determine whether it is a real blockage and prevent false alarms of blockage.

[0061] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0062] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for preventing false alarms during ink filling in an ink path system, characterized in that, include: After starting the ink filling process, obtain the real-time flow rate of the ink circulation loop in the ink path system; Based on the real-time flow value, detect the rate of change of the real-time flow value within the dynamic suppression time; The blockage status of the ink path system is determined based on the real-time flow rate and the rate of change of the real-time flow rate.

2. The ink filling false alarm prevention method for the ink path system according to claim 1, characterized in that, The step of determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate includes: If the rate of change of the real-time flow value is less than the flow change threshold, and the real-time flow value drops below the alarm threshold within the dynamic suppression time, it is determined that the ink path system is not blocked; the flow change threshold is less than 0.

3. The ink filling and false alarm prevention method for the ink path system according to claim 2, characterized in that, The step of determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate further includes: If the rate of change of the real-time flow value is less than the flow change threshold, and the real-time flow value does not decrease to below the alarm threshold within the dynamic suppression time, then the detection of the real-time flow value continues. If the real-time flow rate drops below the alarm threshold during the extended monitoring period, it is determined that the ink path system is not blocked.

4. The ink filling false alarm prevention method for the ink path system according to claim 2, characterized in that, The step of determining the blockage status of the ink system based on the real-time flow rate and the rate of change of the real-time flow rate further includes: If the rate of change of the real-time flow value is greater than or equal to the flow change threshold and the duration exceeds a preset time, it is determined that the ink path system is blocked; the preset time is less than the dynamic suppression time.

5. The method for preventing false alarms in ink filling of the ink path system according to claim 1, characterized in that, The step of detecting the rate of change of the real-time flow value within the dynamic suppression time, based on the real-time flow value, includes: The rate of change of the real-time flow value was detected multiple times at different times within the dynamic suppression time. The rate of change of the real-time flow value during the dynamic suppression time is calculated based on the average rate of change of each of the real-time flow values.

6. The ink filling false alarm prevention method for the ink path system according to claim 5, characterized in that, The rate of change of the real-time flow value detected multiple times at different times within the dynamic suppression time includes: At least three sampling points are set within the dynamic suppression time; Detect the rate of change of real-time flow values ​​at each sampling point.

7. The ink filling false alarm prevention method for the ink path system according to claim 1, characterized in that, After the ink filling process is initiated, and before acquiring the real-time flow rate value of the ink circulation loop in the ink path system, the process further includes: Obtain the liquid level height of the ink storage cavity in the ink path system; When the liquid level is less than the low liquid level threshold, the ink system is determined to be in the initial ink filling state.

8. An ink path system, characterized in that, include: The system comprises a diaphragm pump, an ink reservoir, an inkjet printhead, and a controller. The ink reservoir and the diaphragm pump form an ink circulation loop. The inkjet printhead is connected to the ink reservoir, or the inkjet printhead is connected to the output end of the diaphragm pump. The controller is connected to the diaphragm pump and is used to execute the ink filling and false alarm prevention method of the ink path system according to any one of claims 1-7.

9. The ink path system according to claim 8, characterized in that, The ink storage cavity includes: an ink tank; the input end of the ink tank is used to connect to an ink cartridge, the output end of the ink tank is connected to the input end of the diaphragm pump, and the output end of the diaphragm pump is connected to the inkjet printhead; Alternatively, the ink storage cavity includes an ink return cavity and an ink inlet cavity; the input end of the ink return cavity is used to connect to an ink cartridge, the output end of the ink return cavity is connected to the input end of the diaphragm pump, the output end of the diaphragm pump is connected to the input end of the ink inlet cavity, and the output end of the ink inlet cavity is connected to the inkjet printhead.

10. The ink path system according to claim 9, characterized in that, The ink path system also includes: a liquid level sensor, connected to the controller; The liquid level sensor is disposed on the inner side wall of the ink tank, or on the inner side wall of the ink return chamber.

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