A resin plug device

Abstract

The utility model discloses a resin hole plugging device, including machine body, reciprocating movement mechanism, hole plugging mechanism and vacuumizing equipment, be provided with the hole plugging cavity and take and put cavity that intercommunication in the machine body, the first warehouse mouth that takes and put cavity is provided with in the top of take and put cavity of machine body, and the machine body is equipped with the first warehouse door for opening or closing first warehouse mouth, reciprocating movement mechanism is located in the machine body, and reciprocating movement mechanism is used for driving circuit board and moves back and forth between take and put cavity and hole plugging cavity, hole plugging mechanism is located in the hole plugging cavity and is located the terminal above the moving path of circuit board, and hole plugging mechanism includes the rack, two first guide rails that are arranged in the inside of rack, the jig net frame that is set up in the bottom of rack and the ink scraping subassembly and ink return subassembly that are side by side set up in the top of jig net frame and can move along first guide rail, vacuumizing equipment is connected hole plugging cavity through vacuum pipeline. The utility model embodiment can promote circuit board hole plugging quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of circuit board printing technology, and in particular to a resin plugging device. Background Technology

[0002] In high-end printed circuit board (PCB) manufacturing, resin plugging is a critical process used to fill microvias and prepare for subsequent electroplating. The quality of plugging directly affects product performance, requiring complete resin filling, no air bubbles, and no excess resin. Currently, most equipment still relies on manual or semi-automatic operation, resulting in low efficiency and poor consistency. Especially when processing small or deep holes, air is difficult to expel, easily generating air bubbles. Open-type operations are also susceptible to contamination, and resin volatiles can affect health. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a resin plugging device that can improve plugging quality and production efficiency.

[0004] A resin plugging device according to this utility model includes a body, a reciprocating moving mechanism, a plugging mechanism, and a vacuuming device. The body has a plugging cavity and a take-up / put-out cavity that are interconnected. The body has a first opening above the take-up / put-out cavity, which connects to the take-up / put-out cavity. The body has a first door for opening or closing the first opening. The reciprocating moving mechanism is located within the body and drives a circuit board to reciprocate between the take-up / put-out cavity and the plugging cavity. The plugging mechanism is located in the plugging cavity and above the end of the circuit board's movement path. The plugging mechanism includes a frame, two first guide rails arranged parallel to each other inside the frame, a jig frame located at the bottom of the frame, and a scraper assembly and a return ink assembly arranged side-by-side above the jig frame and movable along the first guide rails. The vacuuming device is connected to the plugging cavity via a vacuum pipeline.

[0005] The resin plugging device according to the above embodiments of the present invention has at least the following beneficial effects: This invention integrates the loading / unloading chamber and the hole-plugging chamber into a single body, and utilizes a vacuum system to achieve hole plugging of the circuit board in a sealed environment. This effectively removes air from the holes, significantly reduces residual air bubbles, and improves the fullness and consistency of resin filling. The circuit board is automatically transported via a reciprocating mechanism, eliminating the need for manual intervention or external robotic arms, shortening process transition time, increasing production cycle time, and adapting to the needs of continuous and intelligent production lines. The ink scraper and ink return components are arranged side-by-side on the same guide rail system, allowing for independent and rapid switching with precise and synchronized movements. This prevents resin from drying and clogging the screen, reduces cleaning frequency, and extends the lifespan of the screen frame and scraper. The first chamber door is linked to the loading / unloading chamber, opening only at a safe position to prevent misoperation, ensure personnel safety, and reduce environmental dust pollution and resin volatilization, improving the working environment. Furthermore, the machine's internal layout is rational, with highly integrated functional modules and a small footprint, facilitating integration into existing PCB production lines and reducing equipment deployment and maintenance costs. In summary, this utility model embodiment, while ensuring high precision and high quality via plugging, significantly improves the level of automation and production efficiency, meeting the stringent requirements of high-end PCB manufacturing for stable, clean, and intelligent processes.

[0006] According to some embodiments of the present invention, the reciprocating moving mechanism includes two second guide rails arranged in parallel within the body, a platform slidably connected between the two second guide rails, and a first driving structure for moving the platform. The top surface of the platform is provided with a placement groove for placing a frame plate, and the frame plate is used to accommodate the circuit board and has different specifications.

[0007] According to some embodiments of this utility model, electromagnets are provided at both the beginning and end of the second guide rail, and positioning magnets are provided on both sides of the platform, and the electromagnets and the positioning magnets are magnetically attracted to each other.

[0008] According to some embodiments of the present invention, the plugging mechanism further includes two sliding frames that are slidably connected to the two first guide rails, and a second driving structure that drives the sliding frames to move. The ink scraping assembly and the ink return assembly are mounted on the sliding frames.

[0009] According to some embodiments of the present invention, the doctor blade assembly includes two first cylinders respectively mounted on two sliding frames with their piston rods facing downwards, a first crossbeam connected between the piston rods of the two first cylinders, and a doctor blade mounted on the first crossbeam.

[0010] According to some embodiments of the present invention, the doctor blade can move along the first crossbeam and be fixed in position by fasteners.

[0011] According to some embodiments of the present invention, the ink return assembly includes two second cylinders respectively mounted on two sliding frames with their piston rods facing downwards, a second crossbeam connected between the piston rods of the two second cylinders, and an ink return blade mounted on the second crossbeam.

[0012] According to some embodiments of the present invention, the ink return blade can move along the second crossbeam and be fixed in position by fasteners.

[0013] According to some embodiments of the present invention, a winch is fixedly installed on the top of the machine body, the inner side of the first compartment door is hinged to the machine body, the winch is connected to the outer side of the first compartment door by a chain or rope, and a first rubber sealing strip is provided on the bottom edge of the first compartment door.

[0014] According to some embodiments of the present invention, a second compartment opening communicating with the plug cavity is provided on one side of the machine body, and a second compartment door for opening or closing the second compartment opening is provided on the machine body. The second compartment door is located at the end of the moving path of the ink scraping assembly and the ink return assembly. The second compartment door is provided with a transparent window, and a second rubber sealing strip is provided on the edge of the second compartment door that contacts the machine body.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the resin plugging device according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the reciprocating movement mechanism according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the plugging mechanism according to an embodiment of the present invention; In the attached figures, the following labels are used: Body 100; plugging cavity 101; take-out cavity 102; first compartment opening 103; second compartment opening 104; first compartment door 110; second guide rail 120; electromagnet 121; platform 130; placement slot 131; positioning magnet 132; frame plate 140; winch 150; second compartment door 160; Frame 200; First guide rail 210; Fixture frame 220; Sliding frame 230; First cylinder 240; First crossbeam 250; Doctor blade 260; Second cylinder 270; Second crossbeam 280; Return blade 290; Vacuum equipment 300; vacuum pipeline 310. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] Reference Figures 1 to 4 According to the present invention, a resin plugging device includes a body 100, a reciprocating moving mechanism, a plugging mechanism, and a vacuum device 300. The body 100 has a plugging cavity 101 and a take-and-place cavity 102 that are interconnected. A first opening 103 communicating with the take-and-place cavity 102 is provided above the body 100. A first door 110 for opening or closing the first opening 103 is provided on the body 100. The reciprocating moving mechanism is located within the body 100 and is used to drive... The circuit board reciprocates between the pick-and-place cavity 102 and the plugging cavity 101; the plugging mechanism is located in the plugging cavity 101 and above the end of the circuit board's movement path. The plugging mechanism includes a frame 200, two first guide rails 210 arranged in parallel inside the frame 200, a jig frame 220 located at the bottom of the frame 200, and a scraper assembly and a return ink assembly arranged side by side above the jig frame 220 and movable along the first guide rails 210; the vacuum equipment 300 is connected to the plugging cavity 101 through a vacuum pipeline 310.

[0022] It is understood that this embodiment of the invention integrates the pick-and-place chamber 102 and the hole-plugging chamber 101 into the same body 100, and, in conjunction with the vacuum equipment 300, enables the circuit board to complete hole plugging in a sealed environment, effectively expelling air from the holes, significantly reducing residual air bubbles, and improving the fullness and consistency of resin filling. The circuit board is automatically transported by a reciprocating moving mechanism, eliminating the need for manual intervention or external robotic arms, shortening process connection time, increasing production cycle time, and adapting to the needs of continuous and intelligent production lines. The ink scraper assembly and ink return assembly are arranged side-by-side on the same guide rail system, allowing for independent and rapid switching with precise and synchronized movements, preventing resin from drying and clogging the screen, reducing cleaning frequency, and increasing the service life of the screen frame and scraper. The first chamber door 110 is linked to the pick-and-place chamber 102, opening only in a safe position to prevent misoperation, ensure personnel safety, and reduce environmental dust pollution and resin volatilization, improving the working environment. Furthermore, the internal layout of the body 100 is reasonable, with highly integrated functional modules, a small footprint, and easy integration into existing PCB production lines, reducing equipment deployment and maintenance costs. In summary, this utility model embodiment, while ensuring high precision and high quality via plugging, significantly improves the level of automation and production efficiency, meeting the stringent requirements of high-end PCB manufacturing for stable, clean, and intelligent processes.

[0023] Furthermore, refer to Figure 1 and Figure 3 According to some embodiments of the present invention, the reciprocating moving mechanism includes two second guide rails 120 arranged in parallel within the body 100, a platform 130 slidably connected between the two second guide rails 120, and a first driving structure for moving the platform 130. The top surface of the platform 130 is provided with a placement groove 131 for placing a frame plate 140. The frame plate 140 is used to accommodate circuit boards and has different specifications.

[0024] It is understood that the stage 130 achieves stable reciprocating movement through the second guide rail 120 and the first drive structure. Combined with the placement slot 131 in the middle and the frame plate 140 adaptable to different specifications, it can flexibly accommodate circuit boards of various sizes, improving equipment versatility and production flexibility, reducing line changeover and debugging time, and increasing equipment utilization. In this embodiment of the invention, the first drive structure can be a cylinder, a lead screw motor, or other similar structure, which can be determined according to the actual situation and is not specifically limited here.

[0025] Furthermore, refer to Figure 1 and Figure 3 According to some embodiments of the present invention, electromagnets 121 are provided at both the beginning and end of the second guide rail 120, and positioning magnets 132 are provided on both sides of the platform 130, and the electromagnets 121 and the positioning magnets 132 can be magnetically attracted to each other.

[0026] It is understandable that electromagnets 121 are set at the beginning and end of the second guide rail 120, which cooperate with the positioning magnets 132 on the platform 130 to achieve precise positioning and automatic locking of the platform 130 in the pick-up and put-out position and the hole-plugging position, so as to avoid displacement errors caused by inertia or vibration, and improve the hole-plugging accuracy and operation safety.

[0027] Furthermore, refer to Figure 1 , Figure 2 and Figure 4 According to some embodiments of this utility model, the plugging mechanism further includes two sliding frames 230 slidably connected to two first guide rails 210, and a second driving structure for moving the sliding frames 230. The ink scraping assembly and the ink return assembly are mounted on the sliding frames 230. In embodiments of this utility model, the second driving structure may be a cylinder, a lead screw motor, or other similar structure, which can be determined according to the actual situation and is not specifically limited here.

[0028] Understandably, the squeegee assembly and the ink return assembly are mounted on the sliding frame 230 and driven by the second drive structure to ensure that the two move synchronously and along the same path, with stable and reliable operation. This facilitates precise matching with the stage 130, improving squeegee quality and equipment operating cycle time.

[0029] Furthermore, refer to Figure 1 , Figure 2 and Figure 4 According to some embodiments of the present invention, the doctor blade assembly includes two first cylinders 240 respectively mounted on two sliding frames 230 with their piston rods facing downwards, a first crossbeam 250 connected between the piston rods of the two first cylinders 240, and a doctor blade 260 mounted on the first crossbeam 250.

[0030] It is understandable that by using a dual first cylinder 240 + first crossbeam 250 structure to drive the doctor blade 260, the doctor blade pressure is evenly distributed and the downward pressure is controllable, which effectively avoids excessive local pressure causing resin overflow or insufficient pressure causing incomplete filling, thus improving the fullness of the plugging holes and the surface smoothness.

[0031] Furthermore, refer to Figure 1 , Figure 2 and Figure 4 According to some embodiments of the present invention, the doctor blade 260 can move along the first crossbeam 250 and be fixed in position by fasteners.

[0032] Understandably, the doctor blade 260 can be laterally adjusted and locked on the first crossbeam 250, facilitating flexible adjustment of its position according to the screen frame pattern or hole distribution. This adapts to different product process requirements without requiring replacement of the entire assembly, reducing debugging costs and maintenance complexity. For details, refer to... Figure 2The top of the doctor blade 260 is hollow so that it can be fitted onto the first crossbeam 250, thereby enabling it to move laterally along the first crossbeam 250 and be fixed in position by fasteners provided on the top. The fasteners can be bolts, screws, pins, or other structural methods, which can be determined according to the actual situation and are not specifically limited here.

[0033] Furthermore, refer to Figure 1 , Figure 2 and Figure 4 According to some embodiments of the present invention, the ink return assembly includes two second cylinders 270 respectively mounted on two sliding frames 230 with their piston rods facing downwards, a second crossbeam 280 connected between the piston rods of the two second cylinders 270, and an ink return blade 290 mounted on the second crossbeam 280.

[0034] Understandably, the ink return assembly adopts a dual second cylinder 270 + second crossbeam 280 structure to achieve stable downward pressure of the ink return blade 290 and uniform ink return, avoiding resin accumulation or drying on the screen, ensuring that the screen is in a consistent state before each printing, and improving process repeatability and yield.

[0035] Furthermore, refer to Figure 1 , Figure 2 and Figure 4 According to some embodiments of the present invention, the ink return knife 290 can move along the second crossbeam 280 and be fixed in position by fasteners.

[0036] Understandably, the 290-degree reflow blade position can be adjusted and fixed laterally to easily match different printing areas or avoid non-working areas, flexibly adapting to various screen designs, improving equipment adaptability, while reducing scratch damage and extending the life of the blade and screen. For details, please refer to... Figure 2 The top of the ink return knife 290 is hollow so that it can be fitted onto the second crossbeam 280, thereby enabling it to move laterally along the second crossbeam 280 and be fixed in position by fasteners set at the top. The fasteners can be bolts, screws, pins, etc., and can be determined according to the actual situation, without being specifically limited here.

[0037] Furthermore, refer to Figure 1 According to some embodiments of the present invention, a winch 150 is fixedly installed on the top of the body 100, the inner side of the first compartment door 110 is hinged to the body 100, the winch 150 is connected to the outer side of the first compartment door 110 by a chain or rope, and a first rubber sealing strip is provided on the bottom edge of the first compartment door 110.

[0038] Understandably, the winch 150 drives the first chamber door 110 to open and close via a chain / rope. The structure is simple and reliable. With the bottom rubber sealing strip, it forms a good seal when closed, effectively isolating external dust and moisture, maintaining the cleanliness and vacuum stability of the chamber, and reducing noise and mechanical impact when the chamber door is opened and closed.

[0039] Furthermore, refer to Figure 1 According to some embodiments of the present invention, a second compartment opening 104 communicating with the plug cavity 101 is provided on one side of the body 100, and a second compartment door 160 for opening or closing the second compartment opening 104 is provided on the body 100. The second compartment door 160 is located at the end of the moving path of the ink scraping assembly and the ink return assembly. The second compartment door 160 is provided with a transparent window, and a second rubber sealing strip is provided on the edge of the second compartment door 160 that contacts the body 100.

[0040] Understandably, the second compartment opening 104, in conjunction with the second compartment door 160 with a transparent viewing window, allows operators to observe the plugging process in real time without interrupting operations or disrupting the vacuum environment, thus improving process controllability. Furthermore, the second compartment door 160 can be opened after operations have stopped for equipment maintenance or parts replacement. The rubber sealing strip ensures sealing, balancing visibility and process stability, and facilitating equipment debugging and troubleshooting.

[0041] The following is the operating principle of the resin plugging device according to an embodiment of this utility model: The operator or upstream robot places the circuit board to be plugged into the frame plate 140 (the frame plate 140 is adapted to the size of the circuit board and can be replaced). Then, the frame plate 140 containing the circuit board is placed into the placement slot 131 on the top of the platform 130 to ensure stable positioning. It should be noted that in the mass production of circuit boards of the same specification, the frame plate 140 with the appropriate specification can be placed into the placement slot 131 first, and then the board loading and unloading work can be repeated. The control system (PLC, etc.) is started, and the winch 150 slowly closes the first compartment door 110 through the chain / rope. Then, the first drive structure drives the platform 130 to move along the second guide rail 120 from the loading and unloading cavity 102 to the plugging cavity 101. When the platform 130 moves to the predetermined position in the plugging cavity 101 (i.e., directly below the plugging mechanism), the terminal electromagnet 121 is energized, and it magnetically engages with the positioning magnet 132 on the side of the platform 130 to achieve millimeter-level precise positioning and locking, preventing deviation during operation. The vacuum equipment 300 is started, and the vacuum tube 310 is used to evacuate the plugging cavity 101, expelling the air in the cavity and the circuit board holes, creating an environment for bubble-free plugging.

[0042] The sealing resin is located on one side of the mold frame 220. At this time, the doctor blade assembly is activated, and the two first cylinders 240 on the doctor blade assembly move synchronously, causing the doctor blade 260 to descend, while the return blade 290 is in an elevated state. The second drive structure drives the sliding frame 230 to move along the first guide rail 210, causing the doctor blade 260 to scrape the sealing resin onto the circuit board, allowing the resin to enter the pre-drilled holes on the circuit board. After the doctor blade 260 stops, the two first cylinders 240 on it drive the doctor blade 260 to rise. At this time, the two second cylinders 270 on the return blade 290 are activated, causing the return blade 290 to descend and adhere to the circuit board. The second drive structure drives the sliding frame 230 to return to its original position, and the return blade 290 drives the sealing resin back to its initial position. The circuit board now has a smooth surface, with the sealing resin filling the holes.

[0043] After the circuit board holes are plugged, the vacuum is released, the terminal electromagnet 121 is de-energized and demagnetized, the platform 130 is released, the first drive structure reverses the drive, and the platform 130 returns to the pick-and-place chamber 102 along the second guide rail 120. When the platform 130 returns to the pick-and-place position, the starting electromagnet 121 is energized to attract the positioning magnet 132, achieving precise docking. The winch 150 opens the first chamber door 110, and the operator or robot arm takes out the circuit board with the holes plugged, and then installs the circuit board to be plugged. The above actions are repeated.

[0044] It should be noted that, in this embodiment of the utility model, if it is necessary to make the circuit board on the stage 130 more closely contact the mold frame 220 to reduce the possibility of leakage of the plugging resin, the reciprocating moving mechanism may also include a lifting mechanism for lifting the second guide rail 120 or for lifting the stage 130 at the end of the second guide rail 120. The specific structure of the lifting mechanism can refer to the prior art, and will not be described in detail here.

[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A resin plugging device, characterized in that, include: The body has a plugging cavity and a take-out cavity that are interconnected. The body has a first compartment opening above the take-out cavity that is connected to the take-out cavity. The body has a first compartment door for opening or closing the first compartment opening. A reciprocating moving mechanism is provided inside the machine body, and the reciprocating moving mechanism is used to drive the circuit board to reciprocate between the pick-and-place cavity and the plugging cavity; A hole-plugging mechanism is provided in the hole-plugging cavity and located above the end of the moving path of the circuit board. The hole-plugging mechanism includes a frame, two first guide rails arranged in parallel on the inner side of the frame, a jig frame arranged at the bottom of the frame, and a scraper assembly and a return ink assembly arranged side by side above the jig frame and movable along the first guide rails. A vacuum pumping device, which is connected to the plugging cavity via a vacuum pipeline.

2. The resin plugging device according to claim 1, characterized in that, The reciprocating moving mechanism includes two second guide rails arranged in parallel within the body, a platform slidably connected between the two second guide rails, and a first driving structure for moving the platform. The top surface of the platform has a placement slot for placing a frame plate, which is used to accommodate the circuit board and has different specifications.

3. The resin plugging device according to claim 2, characterized in that, The second guide rail is equipped with electromagnets at both the beginning and end, and positioning magnets are provided on both sides of the platform. The electromagnets and the positioning magnets are magnetically attracted to each other.

4. The resin plugging device according to claim 1, characterized in that, The plugging mechanism further includes two sliding frames that are slidably connected to the two first guide rails, and a second drive structure that drives the sliding frames to move. The ink scraping assembly and the ink return assembly are mounted on the sliding frames.

5. The resin plugging device according to claim 4, characterized in that, The doctor blade assembly includes two first cylinders respectively mounted on two sliding frames with their piston rods facing downwards, a first crossbeam connected between the piston rods of the two first cylinders, and a doctor blade mounted on the first crossbeam.

6. The resin plugging device according to claim 5, characterized in that, The doctor blade can move along the first crossbeam and is fixed in position by fasteners.

7. The resin plugging device according to claim 4, characterized in that, The ink return assembly includes two second cylinders respectively mounted on two sliding frames with their piston rods facing downwards, a second crossbeam connected between the piston rods of the two second cylinders, and an ink return blade mounted on the second crossbeam.

8. The resin plugging device according to claim 7, characterized in that, The ink return blade can move along the second crossbeam and is fixed in position by fasteners.

9. The resin plugging device according to claim 1, characterized in that, A winch is fixedly installed on the top of the machine body. The inner side of the first compartment door is hinged to the machine body. The winch is connected to the outer side of the first compartment door by a chain or rope. A first rubber sealing strip is provided at the bottom edge of the first compartment door.

10. The resin plugging device according to claim 1, characterized in that, A second compartment opening communicating with the plug cavity is provided on one side of the machine body. A second compartment door for opening or closing the second compartment opening is provided on the machine body. The second compartment door is located at the end of the moving path of the ink scraping assembly and the ink return assembly. The second compartment door is provided with a transparent window. A second rubber sealing strip is provided on the edge of the second compartment door that contacts the machine body.

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