Ink filtering device of ink-jet printer, printer, ink supply system and use method

Abstract

The invention belongs to the field of printers, and particularly discloses an ink filtering device of an ink-jet printer, the printer, an ink supply system and a using method.The ink filtering device of the ink-jet printer is composed of an upper cover (11), a first filtering assembly (12), a second filtering assembly (13), a third filtering assembly (14), a base (15), a connecting assembly (16) and a shell (17); the invention further provides a printer comprising the ink filtering device of the ink-jet printer, an ink supply system and a use method of the ink supply system. The ink filtering device of the ink-jet printer is reliable in structure, filtering assemblies with different precisions can be combined and adjusted according to actual requirements, the filtering structure further has a bubble filtering function, the printing quality can be improved, meanwhile, the ink filtering device is made of an ink corrosion resisting material, and the ink filtering device can be widely applied to ink.

Description

Technical Field

[0001] The present application belongs to the field of printers, and specifically relates to an ink filter device for an inkjet printer, a printer, an ink supply system and a method of use. Background Art

[0002] Globally, digital inkjet printing equipment manufacturers are mainly concentrated in industrially developed countries such as the United States, Japan, and Italy. Driven by the strategy of Chinese enterprises, the domestic digital inkjet printing equipment industry has achieved certain development, but there is still a gap compared with the world's leading level.

[0003] In the emerging manufacturing industry, inkjet printing technology, as an important technical means, has long broken through the original limitations and is no longer limited to surface printing on paper or fabrics. It has broad application prospects in fields such as electronic manufacturing and additive manufacturing. In these technical industries, the quality of ink flowing through the nozzle has an important impact on the inkjet printing effect. To ensure the printing quality, the ink needs to be filtered for impurities and bubbles to avoid impurities and bubbles in the ink clogging the nozzle, resulting in inkjet angle deviation, inkjet discontinuity and other problems. These problems will not only reduce the printing quality, but also affect the life of the nozzle.

[0004] In the prior art, the material and structure of the ink filter assembly of the inkjet printer are not sufficient to solve these problems, so it is particularly important to design and prepare a new type of inkjet printer filter device.

[0005] Application Contents

[0006] The purpose of this application is to solve the deficiencies of the prior art and provide an ink filter device for an inkjet printer, a printer, an ink supply system and a method of use, which specifically adopt the following technical solutions:

[0007] In a first aspect, the present application provides an ink filter device for an inkjet printer, comprising: an upper cover, a first filter component, a second filter component, a third filter component, a base, a connecting component and a housing;

[0008] The first filter component includes a first filter pore structure and a first filter follicle membrane;

[0009] The second filter component includes a second filter pore structure and a second filter follicle membrane;

[0010] The third filter component includes a third filter pore structure and a third filter follicle membrane;

[0011] The first filter pore structure, the second filter pore structure and the third filter pore structure include impurity filtering membranes, and the impurity filtering membranes include a first anti-sticking layer, a base layer and a second anti-sticking layer arranged in sequence;

[0012] The base layer is made of quartz glass; the first anti-sticking layer and the second anti-sticking layer include fluorine-containing polymer materials;

[0013] The upper cover, the first filter assembly, the second filter assembly, the third filter assembly and the base are connected through a connecting assembly, and an outer shell is arranged around the outer side, and the upper and lower ends of the outer shell are respectively connected to the upper cover and the base.

[0014] In some preferred implementations, the upper cover includes an upper cover structure, a first upper cover hole, a second upper cover hole and an upper cover sealing ring, and the upper cover is also provided with a flow sensor.

[0015] In some preferred implementations, the first filter component further comprises a first substrate; the second filter component further comprises a second substrate; and the third filter component further comprises a third substrate.

[0016] In some preferred implementations, the components of the first follicular membrane, the second follicular membrane, and the third follicular membrane include polytetrafluoroethylene.

[0017] In some preferred implementations, the base comprises: a base structure, a first base hole, a second base hole and a base sealing ring.

[0018] In some preferred implementations, the fluorine-containing polymer material includes polytetrafluoroethylene, perfluoroalkoxyethylene and a fluorine-containing coupling agent.

[0019] In some preferred implementations, the connection assembly comprises: a connection frame and a connection sealing ring.

[0020] In a second aspect, the present application also provides an inkjet printer comprising the above-mentioned inkjet printer ink filtering device.

[0021] In the third aspect, the present application also provides an inkjet printer ink supply system including the above-mentioned inkjet printer, specifically including: an ink supply bottle, a first circulation bottle, a second circulation bottle, a first switching component, a second switching component, a first filter device, a second filter device and a nozzle; the first filter device and the second filter device include an inkjet printer ink filter device.

[0022] In some preferred implementations, a filter section is provided in the ink supply system, and the filter section specifically includes a first filter device and a second filter device;

[0023] In a fourth aspect, the present application further provides a method for using the ink supply system of the inkjet printer, the method comprising the following contents:

[0024] The ink supply bottle is used to provide ink for the entire ink supply system. The first circulation bottle is connected to the filter section through the first switching component. The ink flows into the nozzle through the second switching component after being filtered, and the remaining ink flows to the second circulation bottle. The second circulation bottle returns the ink to the first circulation bottle to realize the ink circulation of the ink supply system.

[0025] The first switching component and the second switching component are used to control the connection mode of the first filter device and the second filter device in the filter section and the ink supply system. When it is monitored that the flow rate of the first filter device is lower than the usage requirement, the first switching component is used to connect the second filter device to the first circulation bottle, and the second switching component is used to connect the second filter device to the nozzle.

[0026] The beneficial effects of this application are:

[0027] The ink filter device for inkjet printers provided by the present application has a reliable structure, and each component is an independent structure, which is easy to disassemble and install. When using it, the user can adjust the combination according to actual needs to balance the filtering efficiency and filtering accuracy. Not only that, on the basis of multi-level high-precision impurity filtering, it also has a bubble filter function, which is conducive to improving the printing quality. Not only that, because it is made of ink corrosion-resistant materials, it can be used for a wide range of inks. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Shown is an ink filter device for an inkjet printer and a cross-sectional schematic diagram thereof in a specific embodiment;

[0029] Figure 2 Shown are the filter components of the ink filter device of the inkjet printer and their cross-sectional schematic diagrams in a specific embodiment;

[0030] Figure 3 Shown is a connecting assembly of an ink filter device for an inkjet printer and a cross-sectional schematic diagram thereof in a specific embodiment;

[0031] Figure 4 Shown is an upper cover assembly of an ink filter device of an inkjet printer and a cross-sectional schematic diagram thereof in a specific embodiment;

[0032] Figure 5 Shown is a schematic cross-sectional view of a base assembly of an ink filter device for an inkjet printer in a specific embodiment;

[0033] Figure 6 Shown is a housing assembly of an ink filter device for an inkjet printer and a cross-sectional schematic diagram thereof in a specific embodiment;

[0034] Figure 7 Shown is a schematic diagram of an ink supply system of an inkjet printer in a specific implementation manner;

[0035] Legend: 11 upper cover; 12 first filter assembly; 13 second filter assembly; 14 third filter assembly; 15 base; 16 connecting assembly; 17 housing;

[0036] 111 upper cover structure; 112 first upper cover hole; 113 second upper cover hole; 114 upper cover sealing ring; 121 first filter hole structure; 122 first filter follicle membrane; 123 first substrate; 131 second filter hole structure; 132 second filter follicle membrane; 133 second substrate; 141 third filter hole structure; 142 third filter follicle membrane; 143 third substrate; 151 base structure; 152 first base hole; 153 second base hole; 154 base sealing ring; 161 connector frame; 162 connector sealing ring. DETAILED DESCRIPTION

[0037] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of this application, so as to fully understand the purpose, scheme and effect of this application. It should be noted that the embodiments and features in the embodiments of this application can be combined with each other without conflict.

[0038] It should be noted that all directional indications in this embodiment (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Combine the following Figures 1 to 6 The embodiments of the present application are described.

[0042] First, the present application provides an ink filter device for an inkjet printer, comprising: an upper cover 11, a first filter assembly 12, a second filter assembly 13, a third filter assembly 14, a base 15, a connecting assembly 16 and a housing 17;

[0043] In this specific embodiment, a cylindrical filter device is used as an example (in some other specific implementations, the filter device can be other shapes).

[0044] The upper cover 11 is connected to the first filter component 12 via the connecting component 16; the first filter component 12 is connected to the second filter component 13 via the connecting component 16; the second filter component 13 is connected to the third filter component 14 via the connecting component 16; the third filter component 14 is connected to the base 15 via the connecting component 16; the upper cover 11 is connected to the base 15 via the outer shell 17 (in some other specific implementations, multiple filter components can also be extended for combination).

[0045] The upper cover 11 is provided with a first upper cover hole 112, and the base 15 is provided with a first base hole 152. The first upper cover hole 112 and the first base hole 152 can be connected to the ink system of the printer. The ink flows from the upper cover 11 through the first upper cover hole 112 through the first filter component 12, the second filter component 13 and the third filter component 14 in sequence, and is then transported back to the ink system from the first base hole 152 of the base 15 after being filtered by each filter component.

[0046] In this specific embodiment provided in the present application, the upper cover 11 is composed of an upper cover structure 111, a first upper cover hole 112, a second upper cover hole 113 and an upper cover sealing ring 114, and the upper cover 11 is also provided with a flow sensor; the base 15 is composed of a base structure 151, a first base hole 152, a second base hole 153 and a base sealing ring 154.

[0047] Among them, the internal pipe diameter of the upper cover 11 and the base 15 is the same as that of the first filter component 12, and the two can be connected by a connecting component 16 to form a sealing structure. At the same time, the upper cover 11 also has an extension structure, and the extension structure also has a matching structure that can be locked with the outer shell 17, so that the outer shell 17 can stably connect and fix the upper cover 11 and the base 15 to form a stable filtering device as a whole.

[0048] In this specific embodiment provided in the present application, the first filter component 12 is composed of: a first filter pore structure 121, a first follicular membrane 122 and a first matrix 123; the second filter component 13 is composed of: a second filter pore structure 131, a second follicular membrane 132 and a second matrix 133; the third filter component 14 is composed of: a third filter pore structure 141, a third follicular membrane 142 and a third matrix 143.

[0049] Specifically, the first substrate 123 serves as an integral structural component of the first filter component 12 and acts as the outer wall of the first filter component 12; the first filter pore structure 121 is arranged inside the cavity of the first filter component 12 and is perpendicular to the tube wall of the first filter component 12 (but in some other specific implementations, the two are not in a perpendicular position relationship to each other); the first filter follicle membrane 122 is arranged on the side wall of the first filter component 12, and a plurality of circular holes are also provided on the side wall of the first filter component 12, so that the first filter follicle membrane 122 can filter and discharge the gas into the cavity between the first filter component 12 and the outer shell 17.

[0050] Specifically, the second substrate 133 serves as an integral structural component of the second filter component 13 and acts as the outer wall of the second filter component 13; the second filter pore structure 131 is arranged inside the cavity of the second filter component 13 and is perpendicular to the tube wall of the second filter component 13 (but in some other specific implementations, the two are not in a perpendicular position relationship to each other); the second filter follicle membrane 132 is arranged on the side wall of the second filter component 13, and a plurality of circular holes are also provided on the side wall of the second filter component 13, so that the second filter follicle membrane 132 can filter and discharge the gas into the cavity between the second filter component 13 and the outer shell 17.

[0051] Specifically, the first substrate 143 serves as an integral structural component of the third filter component 14 and acts as the outer wall of the third filter component 14; the third filter pore structure 141 is arranged inside the cavity of the third filter component 14 and is perpendicular to the tube wall of the third filter component 14 (but in some other specific implementations, the two are not in a perpendicular position relationship to each other); the third filter follicle membrane 142 is arranged on the side wall of the third filter component 14, and a plurality of circular holes are also provided on the side wall of the third filter component 14, so that the third filter follicle membrane 142 can filter and discharge the gas into the cavity between the third filter component 14 and the outer shell 17.

[0052] In this specific implementation provided in the present application, the connection component 16 is composed of: a connection member frame 161 and a connection member sealing ring 162 .

[0053] like Figure 3 The figure shows a connection component 16, which is made of polytetrafluoroethylene and is used for connection and sealing between the upper cover 11, the first filter component 12, the second filter component 13, the third filter component 14, and the base 15. The connection component 16 includes a connection frame 161 and a connection sealing ring 162. The connection frame 161 is a symmetrical structure, and its upper and lower circular ring end faces are used to compress each impurity filter membrane in each filter component. A groove is designed below the end face, which cooperates with an O-ring to connect the components in sequence and achieve sealing.

[0054] The first filter pore structure 121, the second filter pore structure 131 and the third filter pore structure 141 include corresponding first impurity filter membranes, second impurity filter membranes and third impurity filter membranes, and there are through holes on each impurity filter membrane; the impurity filter membrane is composed of no less than three layers, including a first anti-sticking layer, a base layer, and a second anti-sticking layer in sequence.

[0055] In this specific embodiment provided in the present application, the components of the first follicular membrane, the second follicular membrane and the third follicular membrane are polytetrafluoroethylene.

[0056] In this specific embodiment provided in the present application, each follicle membrane in the filter assembly is used to eliminate bubbles in the ink. The follicle membrane is composed of a polymer microporous membrane and a polymer substrate, preferably made of a polytetrafluoroethylene ink-resistant material. The polymer microporous membrane has the function of being breathable and impermeable. When the ink contacts the microporous membrane, the air mixed in the ink is separated from the ink through the microporous membrane and enters between the shell and the follicle membrane. At the same time, a negative pressure is set between the shell and the follicle membrane to increase the pressure difference between the ink side and the air side of the microporous membrane, thereby improving the follicle efficiency. The polymer substrate is used to provide support for the microporous membrane, and the polymer substrate has a uniformly distributed pore size much larger than the pores of the microporous membrane, providing a diversion effect for the gas. The polymer microporous membrane and the polymer substrate are preferably combined together by a high-temperature processing method. Under the action of high temperature, the polymer microporous membrane and the substrate molecular chains move and entangle with each other, and the interfacial force is strong and there is no adhesive, etc., which can further improve the corrosion resistance of the filter device.

[0057] In this specific embodiment provided in the present application, the impurity filtering membrane in each filter component is a sandwich structure, which is composed of an anti-sticking layer, a base layer and an anti-sticking layer in sequence. The preparation method of the structure is: using quartz glass as the base of the filter membrane layer, preparing an anti-sticking coating on both sides of the glass by spraying (in some other specific implementations, casting, dipping, chemical grafting and chemical deposition can also be used), and then laser drilling is used (in some other specific implementations, machining, wet etching and other methods can also be used) to prepare through holes. The material of the anti-sticking coating is polytetrafluoroethylene (in some other specific implementations, fluorine-containing materials such as perfluoroalkoxyethylene and fluorine-containing coupling agents can also be used). The impurity filter membrane made by the above scheme has no debris during use and has good anti-corrosion effect on various inks, thereby preventing ink deterioration. The pore channel of the impurity filter membrane is hydrophilic and the membrane surface is hydrophobic. Clean water in the pore channel is conducive to the passage of ink. The hydrophobic surface of the membrane can prevent impurities in the ink from quickly depositing on the surface of the filter membrane and clogging the pore channel, resulting in a reduction in the life of the filter membrane. In addition, due to the obstruction of the anti-sticking layer, the interface interaction between impurities and the filter membrane is weak, so it can be cleaned by backwashing, ultrasonic oscillation and other methods for repeated use to increase the life of the filter membrane.

[0058] The structure of the ink filter device of the inkjet printer is divided into an upper cover 11, a connecting component 16, a first filter component 12, a connecting component 16, a second filter component 13, a connecting component 16, a third filter component 14, a connecting component 16, a base 15 and a shell 17 from top to bottom. Each filter component is sealed by the connecting component 16, and the filter components and connecting components can be increased or reduced according to the actual filtering accuracy requirements. It has the advantages of adjustable filtering accuracy and easy maintenance and replacement of filter components.

[0059] In some specific implementations, the ink filter device of the inkjet printer can also have a flow monitoring function. The specific implementation method is: a first sensor and a second sensor are respectively set on the upper cover 11 and the base 15 to monitor the ink flow rate. Due to the existence of the flow rate, there is a time difference in the signals collected by the sensors. Therefore, by collecting the signals of the first sensor and the second sensor when the ink passes through, the flow rate and other data of the ink can be measured. This data can be used to monitor the actual flow rate of the ink, and also provide data reference for the use of the filter device. Under the same inlet flow rate and pressure conditions, when the measured ink flow rate is lower than a certain range, it means that the filter is blocked and needs to be replaced.

[0060] The present application also provides a specific implementation of the impurity filter membrane: first, quartz glass is immersed in polytetrafluoroethylene emulsion, then sintered and annealed, and the surface coating thickness of the obtained quartz glass after treatment is 5 microns and the hydrophilic contact angle is 125 degrees, so as to obtain a raw material of the impurity filter membrane to be punched, and then it is laser punched to obtain the impurity filter membrane; specifically, in the laser punching step, holes of different apertures are punched on different impurity filter membranes to be punched, wherein 30 micron holes are punched on the first impurity filter membrane corresponding to the first filter hole structure 121; 15 micron holes are punched on the second impurity filter membrane corresponding to the second filter hole structure 131; and 10 micron holes are punched on the third impurity filter membrane corresponding to the third filter hole structure 141.

[0061] In some specific implementations, the first follicle membrane 122, the second follicle membrane 132 and the third follicle membrane 142 are polytetrafluoroethylene microporous membranes, the first substrate 123, the second substrate 133 and the third substrate 143 are made of polytetrafluoroethylene, all of which have strong resistance to ink corrosion. The polytetrafluoroethylene microporous membrane is made by biaxially stretching a polytetrafluoroethylene raw film, and the polytetrafluoroethylene substrate is blended with a low-temperature pore-forming agent and polytetrafluoroethylene powder, and is made by preforming, high-temperature sintering and annealing. Finally, the polytetrafluoroethylene microporous membrane is hydraulically coated on the polytetrafluoroethylene substrate and heat-treated to make it bonded.

[0062] like Figure 4 , Figure 5 and Figure 6As shown, the upper cover 11 includes an upper cover structure 111 and an upper cover sealing ring 114. The upper cover structure 111 is also provided with a first upper cover hole 112 and a second upper cover hole 113, wherein the first upper cover hole 112 is used to connect the ink inlet tube, the second upper cover hole 113 is used to connect the negative pressure device to remove the air in the ink, and the upper cover sealing ring 114 is used to connect and seal with other components. The base 15 is similar to the upper cover structure, wherein the first base hole 152 is used to connect the ink outlet tube, the second base hole 153 is used to connect the negative pressure device, and the base sealing ring 154 is used to connect and seal with other components.

[0063] Secondly, the present application also provides an inkjet printer comprising the above-mentioned inkjet printer ink filter device,

[0064] Secondly, the present application also provides an inkjet printer ink supply system including the above-mentioned inkjet printer, including: an ink supply bottle, a first circulation bottle, a second circulation bottle, a first switching component, a first inkjet printer ink filter device, a second inkjet printer ink filter device, a second switching component and a nozzle.

[0065] Finally, combine Figure 7 The present application also provides a method for using the ink supply system of the inkjet printer, the method comprising the following contents:

[0066] A filter section is provided in the ink supply system, and the filter section specifically includes a first filter device and a second filter device;

[0067] The ink supply bottle is used to provide ink for the entire ink supply system. The first circulation bottle is connected to the filter section. The ink flows into the nozzle after filtering and then flows to the second circulation bottle. The ink in the second circulation bottle returns to the first circulation bottle to realize the ink circulation of the ink supply system. The ink circulation between the first circulation bottle and the second circulation bottle can be powered by liquid level difference, air pressure difference or ink pump. The first switching component and the second switching component are used to control the connection mode of the first filter device and the second filter device with the ink supply system. When it is monitored that the flow rate of the first filter device is lower than the use requirement, the first switching component is used to connect the second filter device with the first circulation bottle, and the second switching component is used to connect the second filter device with the nozzle.

[0068] Although the description of the present application has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims by reference to the attached claims in view of the prior art, thereby effectively covering the intended scope of the present application. In addition, the above description of the present application is based on the foreseeable embodiments of the applicant, the purpose of which is to provide a useful description, and those non-substantial changes to the present application that have not yet been foreseen may still represent equivalent changes to the present application.

Claims

1. An ink filter device for an inkjet printer, characterized in that: include: An upper cover (11), a first filter assembly (12), a second filter assembly (13), a third filter assembly (14), a base (15), a connecting assembly (16) and a housing (17); The first filter component (12) comprises a first filter pore structure (121) and a first filter follicle membrane (122); The second filter component (13) comprises a second filter pore structure (131) and a second filter follicle membrane (132); The third filter component (14) comprises a third filter pore structure (141) and a third filter follicle membrane (142); The first filter pore structure (121), the second filter pore structure (131) and the third filter pore structure (141) comprise impurity filtering membranes, and the impurity filtering membranes comprise a first anti-sticking layer, a base layer and a second anti-sticking layer which are sequentially arranged; The base layer is made of quartz glass; the first anti-sticking layer and the second anti-sticking layer are made of fluorine-containing polymer materials; The upper cover (11), the first filter assembly (12), the second filter assembly (13), the third filter assembly (14) and the base (15) are connected via the connecting assembly (16), and the outer shell (17) is arranged around the outer side, and the upper and lower ends of the outer shell (17) are respectively connected to the upper cover (11) and the base (15).

2. An ink filter device for an inkjet printer according to claim 1, characterized in that: The upper cover (11) comprises an upper cover structure (111), a first upper cover hole (112), a second upper cover hole (113) and an upper cover sealing ring (114); the upper cover (11) is also provided with a flow sensor.

3. The ink filter device for an inkjet printer according to claim 1, characterized in that: The first filter component (12) also comprises a first matrix (123); the second filter component (13) also comprises a second matrix (133); and the third filter component (14) also comprises a third matrix (143).

4. The ink filter device for an inkjet printer according to claim 1, characterized in that: The components of the first follicle membrane, the second follicle membrane and the third follicle membrane include polytetrafluoroethylene.

5. The ink filter device for an inkjet printer according to claim 1, characterized in that: The base (15) comprises: a base structure (151), a first base hole (152), a second base hole (153) and a base sealing ring (154).

6. The ink filter device for an inkjet printer according to claim 1, characterized in that: The fluorine-containing polymer material includes polytetrafluoroethylene, perfluoroalkoxyethylene and a fluorine-containing coupling agent.

7. The ink filter device for an inkjet printer according to claim 1, characterized in that: The connecting component (16) comprises: a connecting component frame (161) and a connecting component sealing ring (162).

8. An inkjet printer, characterized in that: An ink filter device for an inkjet printer comprising the ink filter device according to any one of claims 1 to 7.

9. An ink supply system for an inkjet printer, comprising the ink filter device for an inkjet printer according to any one of claims 1 to 7, characterized in that: The ink supply system of the inkjet printer includes: an ink supply bottle, a first circulation bottle, a second circulation bottle, a first switching component, a second switching component, a first filter device, a second filter device and a nozzle; the first filter device and the second filter device include the ink filter device of the inkjet printer.

10. A method for using an ink supply system for an inkjet printer, comprising the ink supply system for an inkjet printer according to claim 9, characterized in that: The filter section includes the first filter device and the second filter device, and the method for using the ink supply system of the inkjet printer includes the following contents: The ink supply bottle is used to provide ink for the entire ink supply system. The first circulation bottle is connected to the filtering section through the first switching component. The ink flows into the nozzle through the second switching component after being filtered, and the remaining ink flows to the second circulation bottle. The second circulation bottle returns the ink to the first circulation bottle to realize the ink circulation of the ink supply system. The first switching component and the second switching component are used to control the connection mode of the first filter device and the second filter device in the filter section with the ink supply system. When it is monitored that the flow rate of the first filter device is lower than the usage requirement, the first switching component is used to connect the second filter device with the first circulation bottle, and the second switching component is used to connect the second filter device with the nozzle.

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