Carbon oil character regional printing equipment and method thereof

Abstract

The invention relates to the technical field of printing equipment, and discloses carbon oil character regional printing equipment and a method thereof.The carbon oil character regional printing equipment comprises a rack and a lifting table arranged on the rack, a workbench is fixed to the upper portion of the rack, and the carbon oil character regional printing equipment further comprises a lifting base fixed to the lifting table; the driving part is fixed on the lifting seat; the guide rail is fixed in the lifting seat; the screen printing plate pieces are fixed on the two sides of the lifting seat; the printing piece is slidably arranged on the guide rail; the controller is fixed above the rack; the start-stop button is fixed above the rack; the positioning plate is fixed on the workbench; the limiting hole is formed in the guide rail; the screen frame is positioned right above the workbench; the screen cloth is fixed in the screen frame; the rotating plate seats are fixed on two sides of the screen frame; through cooperation of the guide rail, the printing frame, the downward pressing frame and the stroke motor, the glue scraping plate and the downward pressing plate press the screen cloth downwards together, and regional accurate printing is achieved; and the screen cloth tension stability is improved through cooperation of the glue scraping plate, the lower pressing plate, the fine adjustment air cylinder and the angle encoder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing equipment, in particular to a carbon oil character sub-region printing equipment and method thereof. BACKGROUND

[0002] In the field of PCB board character and carbon oil printing, the traditional screen printing equipment has long occupied the mainstream position, and its core structure is composed of a fixed screen frame, a screen cloth, a rubber blade and a workbench. During work, the screen cloth is tensioned and fixed through the screen frame, the character or carbon oil pattern to be printed is pre-prepared on the screen cloth, the rubber blade is pressed downward and slides along the surface of the screen cloth, so that the screen cloth is attached to the printed surface of the PCB board in a downward obtuse angle state, and the ink is transferred to the PCB board to complete the printing. In order to avoid the screen cloth and the PCB board being excessively attached, which causes the pattern to be blurred when the screen cloth is lifted, the traditional equipment needs to reserve a certain screen distance, but this design aggravates the hidden danger of printing accuracy.

[0003] The key defect of the traditional equipment is caused by the inherent distribution characteristics of the screen cloth tension: the tension of the two ends of the screen cloth is large and stable because they are directly fixed to the screen frame, and the pattern shift is small during printing; and the tension of the middle region is weak because it is far away from the constraint of the screen frame, and when the rubber blade moves from one end to the other end, the continuous rubber blade pressure will further stretch the screen cloth, resulting in continuous attenuation of the tension of the middle region, and the pattern shift gradually accumulates with the movement of the rubber blade. Especially when printing large-size PCB boards, the coverage area of the screen cloth is expanded, and the tension deficiency problem of the middle region is more prominent, often appearing phenomena such as blurred pattern edge, line deformation and even unit misplacement, and the shift is far beyond the industry tolerance standard.

[0004] The printing defects caused by uneven tension have a significant impact on the performance of the PCB board: the blurred character may cause difficulty in subsequent process recognition, and the carbon oil pattern deformation directly affects the circuit conductivity and insulation, and in severe cases, it causes product scrap. The traditional equipment lacks a targeted adjustment mechanism and cannot dynamically adjust according to the tension characteristics of different regions. When facing a PCB board with multiple unit combinations, the overall offset problem is further magnified - the printing quality of the two-end units is acceptable, but the middle units are seriously deformed and cannot meet the standard, which not only reduces the production yield, but also restricts the mass production capacity of high-precision PCBs, and it is difficult to meet the demand of the industry for high reliability and high consistency printing process. SUMMARY

[0005] The present application provides a carbon oil character sub-region printing equipment and method thereof, which plays a role in sub-region printing.

[0006] To solve the above technical problems, the technical scheme of the present application is as follows: In a first aspect, a carbon oil character sub-region printing equipment comprises a rack and a lifting table arranged on the rack, and a workbench is fixed above the rack, and further comprises: The lifting seat is fixed on the lifting table; the driving part is fixed on the lifting seat; the guide rail is fixed in the lifting seat; the screen part is fixed on both sides of the lifting seat; the printing part is slidingly arranged on the guide rail; the controller is fixed above the rack; the start-stop button is fixed above the rack; the positioning plate is fixed on the workbench; The limiting hole is arranged on the guide rail. The screen frame is located directly above the workbench; the screen cloth is fixed in the screen frame; the rotating plate seat is fixed on both sides of the screen frame; the rotating plate is rotatably arranged on the rotating plate seat; the angle encoder is fixed on the rotating plate seat; the side stand is fixed on both sides of the lifting seat; the fine adjustment air cylinder is fixed on the side stand and is used for detecting the screen cloth inclination angle in cooperation with the angle encoder; The printing frame is slidingly arranged on the lifting seat; the glue scraping plate is located below the printing frame and above the workbench; the pressing frame is slidingly arranged on the lifting seat; the stroke plate has one end fixed on the pressing frame and the other end slidingly penetrating the printing frame and being vertically arranged with the printing frame; the linear displacement sensor is fixed above the printing frame and the pressing frame; the pressing cylinder is fixed on the pressing frame; the pressing slide rod is fixed on the extension end of the pressing cylinder at the top and slidingly penetrates the pressing frame at the bottom and is slidingly inserted into the linear displacement sensor; the pressing plate is fixed below the pressing slide rod and is used for improving the screen cloth tension stability in cooperation with the glue scraping plate, the angle encoder and the fine adjustment air cylinder; The stroke plate is fixed with a visual camera at both ends.

[0007] Further, the printing part further comprises: The printing card seat is fixed on one side of the printing frame and is slidingly inserted into the lifting seat on the other side; the printing slide block is fixed on one side of the printing card seat and is slidingly arranged on the guide rail on the other side; the glue scraping cylinder is fixed on the printing frame; the glue scraping slide rod is fixed on the extension end of the glue scraping cylinder at the top, slidingly penetrates the printing frame and is fixed on the glue scraping plate at the bottom; the ink returning cylinder is fixed on the printing frame; the ink returning curved frame is fixed on the extension end of the ink returning cylinder at the top and is slidingly sleeved on the glue scraping slide rod at the top; the ink returning scraping plate is fixed below the ink returning curved frame.

[0008] Further, the printing part further comprises: The pressing card seat is fixed on one side of the pressing frame and is slidingly inserted into the lifting seat on the other side; the pressing slide block is fixed on one side of the pressing card seat and is slidingly arranged on the guide rail on the other side; the clamping hole is arranged on the pressing slide block; the limiting head is slidingly arranged in the clamping hole and is slidingly inserted into the limiting hole; the spring ring piece is fixed in the clamping hole; the reset spring has one end fixed on the limiting head and the other end fixed on the spring ring piece; the electromagnet is fixed in the clamping hole.

[0009] Further, a stroke slot is arranged below the stroke plate; a stroke gear set is fixed in the stroke slot; a stroke motor is fixed in the printing frame; and a stroke gear is fixed on the output end of the stroke motor and engaged with the stroke gear set.

[0010] Further, the screen element further comprises: A side stand is fixed on both sides of the lifting seat; a fine adjustment cylinder is fixed on the side stand; a side sliding rod is slidably arranged through the side stand, and the upper end of the side sliding rod is fixed on the telescopic end of the fine adjustment cylinder, and the lower end of the side sliding rod is fixed on the seat rotating rod.

[0011] Further, the lifting platform comprises: A lifting base is fixed on the frame; a lifting power assembly is fixed in the lifting base; a lifting plate is fixed on the lifting power assembly; and a lifting linkage rod is fixed at both ends on the lifting plate and at the side away from the lifting plate on the lifting seat.

[0012] Further, the driving element comprises: A chain wheel pair is rotatably arranged on both sides of the lifting seat; a driving motor is fixed on the lifting seat and has an output end fixed on the chain wheel pair; a chain belt has both ends sleeved on the chain wheel pair; and a chain clamping plate has one end fixed on the chain belt and the other end fixed on the printing sliding block.

[0013] In a second aspect, a printing method of a carbon oil character regional printing device is provided, and the method steps are as follows: S1. The worker places the PCB plate to be printed face up on the workbench, so that the upper left corner of the PCB plate is accurately connected with the positioning plate; the controller starts the visual camera to scan the entire screen, identifies the weak tension area of the screen edge and the key line position of the preset pattern, and records the position of the PCB plate printing reference line; S2. The angle encoder detects the initial inclination angle of the screen when it naturally falls, and the linear displacement sensor synchronously obtains the initial distance between the glue scraping plate and the pressing plate. The data of the angle encoder and the linear displacement sensor are transmitted to the controller. S3. The controller drives the stroke motor to adjust the distance between the glue scraping plate and the pressing plate according to the weak tension area identified in S1, so as to avoid deformation caused by insufficient tension corresponding to the strong tension area of the screen; at the same time, the angle of the screen frame is adjusted by the fine adjustment cylinder according to the inclination angle data in S2, so that the key pattern line of the screen is aligned with the PCB plate printing reference line, and the pre-printing calibration is completed.

[0014] Further, the method steps are as follows: S4. Start the glue scraping cylinder and the pressing cylinder to synchronously press the screen and the PCB plate to be printed; when the glue scraping plate starts to scrape the ink, the angle encoder captures the inclination angle change of the screen caused by the force in real time, and the visual camera synchronously dynamically captures the pattern line at the current scraping position. S5. The controller compares the real-time line in S4 with the initial line in S1, and when the offset exceeds the preset value, immediately adjusts the screen frame angle in the opposite direction of the offset through the fine adjustment cylinder until the line offset returns to the tolerance range; S6. During the adjustment process, the straight line displacement sensor monitors the pressure value of the rubber scraping plate and the lower pressing plate on the screen cloth in real time, and when the pressure fluctuation exceeds the stable range, the controller synchronously adjusts the extension and retraction amount of the rubber scraping cylinder and the lower pressing cylinder to maintain the uniform contact pressure of the screen cloth and avoid secondary deformation.

[0015] Further, the method steps are as follows: S7. After the current area printing is completed, the rubber scraping plate and the lower pressing plate are lifted, and the visual camera shoots the rebound state of the screen cloth at the moment when the screen cloth is separated from the PCB board, and records the rebound direction and amplitude; S8. The controller associates the rebound data in S7 with the adjustment parameters of the fine adjustment cylinder during area printing to generate the "tension-deformation characteristic record" of the area and store it in the device memory; S9. Before the printing frame and the lower pressing frame move to the next area through the guide rail, the controller calls the characteristic record in S8 to pre-tilt the screen frame in the opposite direction of the rebound through the fine adjustment cylinder to offset the rebound inertia of the screen cloth; at the same time, the interval between the rubber scraping plate and the lower pressing plate is adjusted through the stroke motor to adapt to the tension characteristics of the screen cloth in the next area, so that the screen cloth is in a stress-free lamination state when it contacts the PCB board, and the whole plate area printing is completed by repeating S4-S8.

[0016] The above scheme of the application at least includes the following beneficial effects: The present application realizes precise area printing by cooperating the guide rail, the printing frame, the lower pressing frame and the stroke motor, and pressing the screen cloth by the rubber scraping plate and the lower pressing plate together: the guide rail provides a stable path for movement, the stroke motor drives the stroke gear to engage with the stroke gear set to accurately adjust the interval between the rubber scraping plate and the lower pressing plate to adapt to the area tension; cooperating with the initial positioning of the positioning plate on the PCB board solves the problem of offset exceeding tolerance in the middle area of the traditional equipment, and guarantees the printing precision of each area of the large-size multi-cell PCB board; and the screen cloth tension stability is improved by cooperating the rubber scraping plate, the lower pressing plate, the fine adjustment cylinder and the angle encoder: the two form a flat area by synchronous pressing to avoid collapse due to insufficient tension in the middle; the fine adjustment cylinder tilts the screen frame through the side slide rod, the angle encoder detects the inclination in real time and feeds back to the controller, dynamically compensates the tension difference, offsets the scraping pressure deformation, prevents the screen cloth pattern from deforming, and guarantees the clarity.

[0017] A closed-loop detection and adjustment mechanism is constructed by a visual camera, a linear displacement sensor and a controller: the visual camera identifies the weak tension area and lines of the screen cloth, the linear displacement sensor monitors the pressure change, and after the data is transmitted to the controller, the stretching and retracting amount of the glue scraping cylinder and the downward pressing cylinder is triggered for fine adjustment, so that the contact pressure of the screen cloth is uniform, secondary deformation is avoided, different PCB flatness is adapted, and the flexible production capacity is improved; through the controller, the visual camera and the "tension-deformation characteristic record" mechanism, cross-area dynamic compensation is realized: after printing in the current area, the visual camera records the rebound state of the screen cloth, the controller stores the rebound data and the adjustment parameters of the fine adjustment cylinder; before moving to the next area, the recorded data is called and the fine adjustment cylinder is driven to drive the screen frame to reverse pre-inclination to offset the rebound inertia, and the travel motor adjusts the interval between the glue scraping plate and the downward pressing plate, so that the screen cloth has no stress when contacting the PCB, the pattern definition and the edge alignment degree of the whole board are consistent, and batch multi-area printing is adapted. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A first perspective view of the overall structure of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 2 A second perspective view of the overall structure of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 3 A lifting seat structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 4 A chain belt structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 3 An enlarged view of position A of the chain belt structure of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 5 A travel motor structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 6 An enlarged view of position B of the travel motor structure of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 5 Figure 7 A travel motor structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 8 A limit head structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 9 A printing frame structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 10 A downward pressing frame structure diagram of the carbon oil character sub-area printing equipment according to the embodiment of the present application is provided. Figure 11 ​A printing process schematic diagram of a carbon oil character sub-region printing equipment provided by the embodiment of the present application is provided. Figure 12 A conventional printing simple schematic diagram of an existing equipment provided by the embodiment of the present application is provided. Figure 13 A sub-region printing simple schematic diagram provided by the embodiment of the present application is provided.

[0019] Explanation of reference signs: In the figure: 1, rack; 2, lifting platform; 201, lifting base; 202, lifting power assembly; 203, lifting plate; 204, lifting linkage rod; 3, workbench; 4, lifting seat; 5, driving piece; 501, chain wheel pair; 502, driving motor; 503, chain belt; 504, chain clamping plate; 6, guide rail; 601, limiting hole; 7, screen piece; 701, screen frame; 702, screen cloth; 703, rotating plate seat; 704, seat rotating rod; 705, angle encoder; 706, side stand plate; 707, fine adjustment air cylinder; 708, side sliding rod; 8, printing piece; 801, printing frame; 802, glue scraping plate; 803, pressing frame; 804, stroke plate; 805, linear displacement sensor; 806, pressing air cylinder; 807, pressing sliding rod; 808, pressing plate; 809, printing clamping seat; 8010, printing sliding block; 8011, glue scraping air cylinder; 8012, glue scraping sliding rod; 8013, ink returning air cylinder; 8014, ink returning curved frame; 8015, ink returning scraping plate; 8016, pressing clamping seat; 8017, pressing sliding block; 8018, clamping hole; 8019, limiting head; 8020, spring ring piece; 8021, reset spring; 8022, electromagnet; 8023, stroke groove; 8024, stroke gear set; 8025, stroke motor; 8026, stroke gear; 9, controller; 10, start-stop button; 11, positioning plate; 12, visual camera. DETAILED DESCRIPTION

[0020] Exemplary embodiments of the present application will be described herein below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0021] As Figures 1 to 10As shown, the embodiment of the present application provides a carbon oil character sub-area printing equipment, which comprises a rack 1 and a lifting platform 2 arranged on the rack 1, a workbench 3 fixed above the rack 1, a lifting seat 4 fixed on the lifting platform 2, a driving member 5 fixed on the lifting seat 4, a guide rail 6 fixed in the lifting seat 4, a screen member 7 fixed on both sides of the lifting seat 4, a printing member 8 slidingly arranged on the guide rail 6, a controller 9 fixed above the rack 1, a start-stop button 10 fixed above the rack 1, a positioning plate 11 fixed on the workbench 3, and a visual camera 12 fixed on both ends of a stroke plate 804.

[0022] A limiting hole 601 is arranged on the guide rail 6, a screen frame 701 is located directly above the workbench 3, a screen cloth 702 is fixed in the screen frame 701, a rotating plate seat 703 is fixed on both sides of the screen frame 701, a rotating seat rod 704 is rotationally arranged on the rotating plate seat 703, an angle encoder 705 is fixed on the rotating plate seat 703, a side stand plate 706 is fixed on both sides of the lifting seat 4, a fine adjustment air cylinder 707 is fixed on the side stand plate 706 and used for detecting the inclination angle of the screen cloth 702 in cooperation with the angle encoder 705, a printing frame 801 is slidingly arranged on the lifting seat 4, a glue scraping plate 802 is located below the printing frame 801 and above the workbench 3, a pressing frame 803 is slidingly arranged on the lifting seat 4, the stroke plate 804 is fixed at one end on the pressing frame 803 and slidingly penetrates the printing frame 801 at the other end and is vertically arranged with the printing frame 801, a linear displacement sensor 805 is fixed above the printing frame 801 and the pressing frame 803, a pressing air cylinder 806 is fixed on the pressing frame 803, a pressing slide rod 807 is fixed at the upper end of the telescopic end of the pressing air cylinder 806 and slidingly penetrates the pressing frame 803 at the lower end and is slidingly inserted into the linear displacement sensor 805, and a pressing plate 808 is fixed below the pressing slide rod 807 and used for improving the tension stability of the screen cloth 702 in cooperation with the glue scraping plate 802, the angle encoder 705 and the fine adjustment air cylinder 707.

[0023] Specifically, the screen frame 701 can adjust the inclination angle, and the angle range is 0-3°; the screen cloth 702 is used for covering on the PCB board; the glue scraping plate 802 is arranged in an inclined manner, which is convenient for scraping ink; the linear displacement sensor 805 is used for detecting the downward displacement of the glue scraping slide rod 8012 and the pressing slide rod 807; and the visual camera 12 is used for positioning the positions of the glue scraping plate 802, the pressing plate 808 and the ink returning scraping plate 8015.

[0024] As a preferred embodiment of the present application, the printing member 8 further comprises: a printing seat 809 fixed on one side of the printing frame 801 and slidably inserted into the lifting seat 4 on the other side; a printing slider 8010 fixed on one side of the printing seat 809 and slidably arranged on the guide rail 6 on the other side; a scraping cylinder 8011 fixed on the printing frame 801; a scraping slide rod 8012 fixed on the extension end of the scraping cylinder 8011 on the top, slidably penetrating through the printing frame 801, and fixed on the scraping plate 802 on the bottom; a ink returning cylinder 8013 fixed on the printing frame 801; an ink returning curved frame 8014 fixed on the extension end of the ink returning cylinder 8013 on the top and slidably sleeved on the scraping slide rod 8012 on the top; and an ink returning scraping plate 8015 fixed on the ink returning curved frame 8014 on the bottom.

[0025] The printing member 8 further comprises: a pressing seat 8016 fixed on one side of the pressing frame 803 and slidably inserted into the lifting seat 4 on the other side; a pressing slider 8017 fixed on one side of the pressing seat 8016 and slidably arranged on the guide rail 6 on the other side; a clamping hole 8018 arranged on the pressing slider 8017; a limiting head 8019 slidably arranged in the clamping hole 8018 and slidably inserted into the limiting hole 601; a spring ring 8020 fixed in the clamping hole 8018; a return spring 8021 fixed on one end of the limiting head 8019 and on the other end of the spring ring 8020; and an electromagnet 8022 fixed in the clamping hole 8018.

[0026] The printing member 8 further comprises: a stroke slot 8023 arranged on the bottom of the stroke plate 804; a stroke gear set 8024 fixed in the stroke slot 8023; a stroke motor 8025 fixed in the printing frame 801; and a stroke gear 8026 fixed on the output end of the stroke motor 8025 and engaged with the stroke gear set 8024.

[0027] Specifically, the ink returning scraping plate 8015 is arranged in an inclined state.

[0028] As a preferred embodiment of the present application, the screen member 7 further comprises: a side slide rod 708 slidably penetrating through the side stand 706, fixed on the extension end of the fine adjustment cylinder 707 on the top, and fixed on the seat rotating rod 704 on the bottom.

[0029] The lifting platform 2 comprises: a lifting base 201 fixed on the bottom of the frame 1; a lifting power assembly 202 fixed in the lifting base 201; a lifting plate 203 fixed on the lifting power assembly 202; and a lifting linkage rod 204 fixed on both ends of the lifting plate 203 and fixed on the lifting seat 4 on the side away from the lifting plate 203.

[0030] As a preferred embodiment of the present application, the driving member 5 comprises: a chain wheel pair 501 rotatably arranged on both sides of the lifting seat 4; a driving motor 502 fixed on the lifting seat 4, and an output end of the driving motor 502 is fixed on the chain wheel pair 501; a chain belt 503, both ends of which are sleeved on the chain wheel pair 501; and a chain clamping plate 504, one end of which is fixed on the chain belt 503, and the other end of the chain clamping plate 504 is fixed on the printing slide block 8010.

[0031] Specifically, the driving motor 502 provides rotating power for the chain belt 503, and the chain clamping plate 504 is connected to the printing slide block 8010 of the printing frame 801, so as to facilitate the movement of the printing frame 801 to the position of the lifting seat 4.

[0032] Working principle, when the staff performs the printing operation, the PCB to be printed is placed with the face to be printed upward, and the upper left corner of the PCB is accurately connected with the positioning plate 11, and then the PCB is stably placed on the workbench 3; after the PCB is placed, the lifting power assembly 202 is started, and the lifting power assembly 202 moves downward in the lifting base 201, and in the moving process, the lifting power assembly 202 drives the lifting plate 203 and the lifting linkage rod 204 to move downward synchronously, so as to drive the lifting seat 4 to move to the preset working position, and the visual camera 12 is used for positioning the positions of the glue scraping plate 802, the pressing plate 808 and the ink returning scraping plate 8015, so as to prepare for the subsequent printing operation.

[0033] The glue scraping cylinder 8011 is started, and the telescopic end of the glue scraping cylinder 8011 performs a retraction action, which drives the glue scraping slide rod 8012 to move downward, and the glue scraping slide rod 8012 further drives the glue scraping plate 802 to move, until the glue scraping plate 802 reaches the mesh cloth 702, the glue scraping plate 802 presses the mesh cloth 702, so that the mesh cloth 702 is closely attached to the face to be printed of the PCB, and a stable interval is formed with the pressing plate 808 and a flat printing area is constructed.

[0034] The electromagnetic iron 8022 and the stroke motor 8025 are started to work; the electromagnetic iron 8022 generates magnetic force after starting to attract the limiting head 8019, the limiting head 8019 is separated from the limiting hole 601 on the guide rail 6, and the limiting head 8019 compresses the return spring 8021; the stroke motor 8025 drives the stroke gear 8026 to rotate, the stroke gear 8026 is engaged with the stroke gear set 8024, the rotation of the stroke gear 8026 drives the stroke gear set 8024 and the stroke plate 804 to displace, the displacement of the stroke plate 804 drives the lower pressing frame 803 to move away from the printing frame 801, until the lower pressing frame 803 reaches the set position, the interval between the glue scraping plate 802 and the lower pressing plate 808 is accurately adjusted through the cooperation of the stroke motor 8025 and the guide rail 6, to adapt to the current printing area characteristics; the electromagnetic iron 8022 stops working, the elastic force of the return spring 8021 drives the limiting head 8019 to reset, the limiting head 8019 is reinserted into another limiting hole 601 on the guide rail 6, and the positioning of the lower pressing frame 803 is completed; the lower pressing cylinder 806 is started, the telescopic end of the lower pressing cylinder 806 retracts, which drives the lower pressing slide rod 807 to move downward, the displacement of the lower pressing slide rod 807 drives the lower pressing plate 808 to displace downward, until the lower pressing plate 808 presses the screen cloth 702, so that the screen cloth 702 is also closely attached to the surface to be printed of the PCB board.

[0035] The position of the screen cloth 702 pressed by the glue scraping plate 802 on the surface to be printed of the PCB board, and the position of the screen cloth 702 pressed by the lower pressing plate 808 on the surface to be printed of the PCB board, the screen cloth 702 between the two positions is in a flat state and is attached to the surface to be printed of the PCB board; this state can effectively prevent the screen cloth 702 from collapsing due to insufficient tension in the middle position, prevent the pattern on the screen cloth 702 from deforming, so as to ensure that the printed pattern is clearer, and physically guarantee the integrity of the pattern during ink transfer, which is the embodiment of the stable and flat printing area formed by the interval design of the glue scraping plate 802 and the lower pressing plate 808.

[0036] The lower pressing plate 808 presses the screen cloth 702 on the PCB board together with the glue scraping plate 802 to form a stable printing basis for the PCB board area; the glue scraping plate 802 scrapes the ink to the right, and the lower pressing plate 808 remains stationary to ensure the tension stability of the screen cloth 702 during the PCB board area printing process, avoid the pattern deviation caused by movement, and cooperate with the synchronous action of the two to ensure the uniform contact pressure and improve the edge alignment of each unit in the sub-area printing; when the printing area pattern is completed, the lower pressing plate 808 and the glue scraping plate 802 are lifted together and separated from the screen cloth 702; then the lower pressing plate 808 and the glue scraping plate 802 are moved to the next preset area by the movable printing frame 801 and the lower pressing frame 803 to realize the sub-area accurate printing of the whole PCB board; according to the actual whole PCB board, the sub-area compensation deformation is selected on the pattern design to achieve more accuracy, and the interval design provides a stable mechanical basis for the sub-area compensation deformation; effectively avoid the tension deficiency of the screen cloth 702 in the middle position and the collapse, prevent the pattern on the screen cloth 702 from deforming, and thus ensure that the printed pattern is clearer.

[0037] The driving motor 502 is started, the driving motor 502 drives the chain wheel pair 501 and the chain belt 503 to rotate, the rotation of the chain belt 503 drives the chain clamping plate 504 to displace, the displacement of the chain clamping plate 504 drives the printing clamping plate 809 and the printing frame 801 to move to the direction of the lower pressing frame 803, in the process of moving of the printing frame 801, the glue scraping plate 802 is scraped on the screen cloth 702; the travel plate 804 of the lower pressing frame 803 is in sliding connection with the printing frame 801, the limiting head 8019 of the lower pressing frame 803 is inserted into the limiting hole 601 of the guide rail 6, the lower pressing frame 803 remains stationary on the guide rail 6 to ensure the stability of the glue scraping operation, and at the same time, the sub-area printing of the whole PCB board can be carried out, and the promotion effect of the interval design and the synchronous action on the sub-area printing accuracy is further strengthened.

[0038] In the process of scraping of the glue scraping plate 802 on the screen cloth 702, the fine adjustment air cylinders 707 on both sides of the lifting seat 4 are started, the telescopic ends of the two fine adjustment air cylinders 707 are retracted to different degrees, the side sliding rods 708 are correspondingly displaced downward, the screen frame 701 and the screen cloth 702 form an inclined state, an included angle is formed between the rotating plate seat 703 of the screen frame 701 and the seat rotating rod 704 of the side sliding rod 708, the tension difference of the sub-area is dynamically adapted, and the tension unevenness of the edge and the middle area is compensated in a targeted manner; the angle encoder 705 installed on the rotating plate seat 703 detects the rotating angle of the seat rotating rod 704 to detect the inclination between the screen frame 701 and the screen cloth 702 in real time, and adjusts in real time according to the detection result, so as to cooperate with the glue scraping action of the glue scraping plate 802 to reduce the deformation degree of the screen cloth 702 in the scraping process and offset the slight deformation caused by the glue scraping pressure change in real time.

[0039] Two fine-tuning air cylinders 707 drive the side slide rods 708 to displace by different degrees of extension and retraction, so that the screen frame 701 and the screen cloth 702 form an adaptive inclined state. This adjustment is not a fixed mode, but is combined with real-time detection of the rotation angle of the seat rotating rod 704 by the angle encoder 705, so that the fine deformation of the screen cloth 702 caused by glue scraping pressure and tension changes can be accurately captured, and the angle is adjusted in real time to offset the deformation influence, thereby avoiding the problem that in traditional equipment, the deformation of the screen cloth 702 during scraping causes cumulative printing deviation. The inclination angle adjustment of the screen frame 701 and the screen cloth 702 cooperates with the tension of the screen cloth 702 in different regions, and the flatness of the PCB board is different. The differential extension and retraction of the fine-tuning air cylinders 707 can adjust the inclination angle of the screen cloth 702 according to the characteristics of the current glue scraping region, compensate for the deformation amount of different sub-regions, and make the state of the screen cloth 702 in each region accurately match the glue scraping action of the glue scraping plate 802. The linkage with the deformation amount compensation in the sub-regions forms a closed loop, which can alleviate the deformation of the middle region of the screen cloth 702 due to insufficient tension, and ensure the consistency and clarity of the printing patterns in each region.

[0040] After the glue scraping plate 802 completes the scraping operation on the screen cloth 702, the glue scraping cylinder 8011 and the downward pressing cylinder 806 are started, the extension and retraction ends of the glue scraping cylinder 8011 and the downward pressing cylinder 806 move upward, and the glue scraping plate 802 and the downward pressing plate 808 no longer press the screen cloth 702. The ink returning cylinder 8013 is started, the extension and retraction end of the ink returning cylinder 8013 extends, drives the ink returning curved frame 8014 to move downward, the ink returning curved frame 8014 drives the ink returning scraping plate 8015 to press on the screen cloth 702, the driving motor 502 is started in reverse, drives the printing frame 801 and the ink returning cylinder 8013 to return to the initial position. The downward pressing frame 803 performs a reset operation, the electromagnet 8022 is started to attract the limit head 8019 to disengage from the clamping hole 8018, and the stroke motor 8025 is started in reverse to drive the stroke plate 804 and the downward pressing frame 803 to reset. The lifting power assembly 202 is started to drive the lifting plate 203, the lifting linkage rod 204 and the lifting seat 4 to move upward, and the overall reset is completed.

[0041] After the printing operation is completed, the worker takes the PCB board off the workbench 3, replaces a new PCB board, and repeats the above operation to perform the next printing. During the entire process, the worker can set various parameters of the printing equipment through the controller 9, press the start-stop button 10 to start a complete printing process, and the equipment will automatically stop and reset after printing is completed. In case of an emergency, the equipment can be stopped by pressing the stop button. The interval design of the glue scraping plate 802 and the downward pressing plate 808 and the cooperation of the angle adjustment mechanism of the screen frame 701 continuously ensure the printing quality and the flexible production capacity of the equipment.

[0042] As shown in Figure 11 The embodiment of the present application provides a printing method of a carbon oil character sub-region printing equipment, and the method steps are as follows: S1. The worker places the PCB board to be printed face up on the workbench 3, with the upper left corner of the PCB board precisely interfacing with the positioning plate 11; the controller 9 starts the visual camera 12 to scan the entire domain of the screen cloth 702, identifies the weak tension area of the edge of the screen cloth 702 and the key line position of the preset pattern, and records the printing reference line position of the PCB board at the same time; S2. The angle encoder 705 detects the initial inclination angle of the screen cloth 702 when it naturally falls, and the linear displacement sensor 805 synchronously acquires the initial interval between the squeegee plate 802 and the lower pressing plate 808, and the data of the angle encoder 705 and the linear displacement sensor 805 are transmitted to the controller 9; S3. The controller 9 drives the stroke motor 8025 to adjust the interval between the squeegee plate 802 and the lower pressing plate 808 according to the weak tension area identified in S1, so as to correspond to the strong tension area of the screen cloth 702 to avoid deformation caused by insufficient tension; at the same time, combined with the inclination angle data of S2, the angle of the screen frame 701 is adjusted by the fine adjustment cylinder 707 to align the key pattern lines on the screen cloth 702 with the printing reference line of the PCB board, and the pre-printing calibration is completed.

[0043] Specifically, before printing, the worker places the PCB board to be printed face up on the workbench 3, with the upper left corner of the PCB board precisely interfacing with the positioning plate 11 to fix the position; the controller 9 starts the visual camera 12 to scan the entire domain of the screen cloth 702, so as to identify the weak tension area of the edge of the screen cloth 702 and the key line position of the preset pattern, and synchronously record the printing reference line position of the PCB board, providing a reference for subsequent calibration; the angle encoder 705 detects the initial inclination angle of the screen cloth 702 in the naturally falling state, and the linear displacement sensor 805 synchronously acquires the initial interval between the squeegee plate 802 and the lower pressing plate 808, and these data are all transmitted to the controller 9 in real time; the controller 9 adjusts the interval between the squeegee plate 802 and the lower pressing plate 808 based on the aforementioned identified weak tension area by driving the stroke motor 8025, so as to correspond to the strong tension area of the screen cloth 702 to avoid deformation caused by insufficient tension; at the same time, combined with the detected initial inclination angle, the angle of the screen frame 701 is adjusted by the fine adjustment cylinder 707 to ensure that the key pattern lines on the screen cloth 702 are aligned with the printing reference line of the PCB board, and the pre-printing calibration is completed.

[0044] A printing method of a carbon oil character regional printing device, the method steps are as follows: S4. Start the squeegee cylinder 8011 and the lower pressing cylinder 806 to synchronously press down the screen cloth 702 and the PCB board to be printed by the squeegee plate 802 and the lower pressing plate 808; when the squeegee plate 802 starts to scrape the ink, the angle encoder 705 captures the inclination angle change of the screen cloth 702 caused by the force in real time, and the visual camera 12 synchronously dynamically photographs the pattern lines at the current squeegee position; S5. The controller 9 compares the real-time line taken in S4 with the initial line in S1, and when the offset exceeds the preset value, immediately adjusts the angle of the screen frame 701 in the opposite direction of the offset through the fine adjustment cylinder 707 until the line offset returns to the tolerance range. S6. During the adjustment process, the linear displacement sensor 805 monitors the pressure value of the screen cloth 702 exerted by the glue scraping plate 802 and the lower pressing plate 808 in real time, and when the pressure fluctuation exceeds the stable range, the controller 9 synchronously fine-tunes the extension and retraction amount of the glue scraping cylinder 8011 and the lower pressing cylinder 806 to maintain the uniform contact pressure of the screen cloth 702 and avoid secondary deformation.

[0045] Specifically, during the printing process, the glue scraping cylinder 8011 and the lower pressing cylinder 806 are first started to make the glue scraping plate 802 and the lower pressing plate 808 synchronously press the screen cloth 702 to ensure that the screen cloth 702 is tightly attached to the PCB board to be printed. When the glue scraping plate 802 starts to scrape the ink, the angle encoder 705 captures the change of the inclination angle of the screen cloth 702 caused by the force in real time, and the visual camera 12 synchronously takes a dynamic picture of the pattern line at the current scraping position. The controller 9 compares the real-time taken line with the initial line recorded in S1, and when the offset exceeds the preset value, immediately adjusts the angle of the screen frame 701 in the opposite direction of the offset through the fine adjustment cylinder 707 until the line offset returns to the tolerance range. During this adjustment process, the linear displacement sensor 805 monitors the pressure value of the screen cloth 702 exerted by the glue scraping plate 802 and the lower pressing plate 808 in real time, and once the pressure fluctuation exceeds the stable range, the controller 9 will synchronously fine-tune the extension and retraction amount of the glue scraping cylinder 8011 and the lower pressing cylinder 806 to maintain the uniform contact pressure of the screen cloth 702 and avoid secondary deformation caused by unstable pressure.

[0046] A printing method of a carbon oil character regional printing device, the method steps are as follows: S7. After the current region printing is completed, the glue scraping plate 802 and the lower pressing plate 808 are lifted, and at the moment when the screen cloth 702 is separated from the PCB board, the visual camera 12 takes a picture of the rebound state of the screen cloth 702, records the rebound direction and amplitude; S8. The controller 9 associates the rebound data of S7 with the adjustment parameters of the fine adjustment cylinder 707 during regional printing to generate the “tension-deformation characteristic record” of the region and store it in the device memory; S9. Before the printing frame 801 and the lower pressing frame 803 move to the next region through the guide rail 6, the controller 9 calls the characteristic record of S8, pre-tilts the screen frame 701 in the opposite direction of the rebound through the fine adjustment cylinder 707 to offset the rebound inertia of the screen cloth 702; at the same time, adjusts the interval between the glue scraping plate 802 and the lower pressing plate 808 through the stroke motor 8025 to adapt to the tension characteristics of the screen cloth 702 of the next region, ensures that the screen cloth 702 is in a stress-free attachment state when contacting the PCB board, and repeats S4-S8 to complete the full-board regional printing.

[0047] Specifically, after the current area printing is completed, the rubber blade 802 and the lower pressing plate 808 are lifted, and at the moment when the mesh cloth 702 is separated from the PCB, the visual camera 12 shoots the rebound state of the mesh cloth 702, and synchronously records the rebound direction and amplitude; the controller 9 associates the rebound data with the adjustment parameters of the fine adjustment cylinder 707 during the area printing, generates the “tension-deformation characteristic record” of the corresponding area and stores it to the device memory; before the printing frame 801 and the lower pressing frame 803 move to the next area through the guide rail 6, the controller 9 calls the above-mentioned characteristic record, and pre-tilts the mesh frame 701 in the opposite direction of the rebound through the fine adjustment cylinder 707 in advance, so as to offset the rebound inertia of the mesh cloth 702; at the same time, the interval between the rubber blade 802 and the lower pressing plate 808 is adjusted through the stroke motor 8025, so as to adapt to the tension characteristics of the mesh cloth 702 of the next area, and ensure that the mesh cloth 702 is in a stress-free lamination state when it contacts the PCB, and then the operations of S4-S8 are repeated to complete the area printing of the whole PCB.

[0048] In example 1, the staff places the PCB to be printed face up on the workbench 3, so that the upper left corner of the PCB is accurately docked with the positioning plate 11 to fix the position; the controller 9 starts the visual camera 12 at both ends of the stroke plate 804 to perform global scanning on the mesh cloth 702, identifies the edge tension weak area and the key line position of the preset pattern, and records the printing reference line position of the PCB at the same time; the angle encoder 705 detects the initial inclination angle of the mesh cloth 702 when it naturally falls, and the linear displacement sensor 805 synchronously obtains the initial interval between the rubber blade 802 and the lower pressing plate 808, and these data are transmitted to the controller 9 in real time; the controller 9 drives the stroke motor 8025 to adjust the interval between the rubber blade 802 and the lower pressing plate 808 based on the identified tension weak area, so that the two correspond to the strong tension area of the mesh cloth 702 to avoid insufficient tension leading to deformation; at the same time, the angle of the mesh frame 701 is adjusted through the fine adjustment cylinder 707 in combination with the initial inclination angle data, so as to ensure that the key pattern lines of the mesh cloth 702 are aligned with the printing reference line of the PCB, and the pre-printing calibration is completed.

[0049] The glue scraping cylinder 8011 and the pressing cylinder 806 are started to make the glue scraping plate 802 and the pressing plate 808 press the screen cloth 702 and the PCB board to be printed closely; when the glue scraping plate 802 starts to scrape the ink, the angle encoder 705 captures the change of the inclination angle of the screen cloth 702 in real time, and the visual camera 12 synchronously captures the pattern line of the current scraping position dynamically; the controller 9 compares the line captured in real time with the initial line, and when the offset exceeds the preset value, the angle of the screen frame 701 is adjusted in the opposite direction of the offset by the fine adjustment cylinder 707 until the line offset returns to the tolerance range; during the adjustment process, the linear displacement sensor 805 monitors the pressure value of the screen cloth 702 pressed by the glue scraping plate 802 and the pressing plate 808 in real time, and when the pressure fluctuation exceeds the stable range, the controller 9 synchronously adjusts the extension and retraction of the glue scraping cylinder 8011 and the pressing cylinder 806 to maintain the uniform contact pressure of the screen cloth 702 and avoid secondary deformation.

[0050] In example 2, on the basis of example 1, after the current area printing is completed, the glue scraping plate 802 and the pressing plate 808 are lifted, and the visual camera 12 captures the rebound state of the screen cloth 702 at the moment when the screen cloth 702 and the PCB board are separated, and accurately records the rebound direction and amplitude; the controller 9 associates the rebound data with the adjustment parameters of the fine adjustment cylinder 707 during the area printing to generate the “tension-deformation characteristic record” of the corresponding area and store it in the device memory.

[0051] Before the printing frame 801 and the pressing frame 803 move to the next area through the guide rail 6, the controller 9 calls the above-mentioned characteristic record, and pre-tilts the screen frame 701 in the opposite direction of the rebound through the fine adjustment cylinder 707 to offset the rebound inertia of the screen cloth 702; at the same time, the interval between the glue scraping plate 802 and the pressing plate 808 is adjusted through the stroke motor 8025 to adapt to the tension characteristics of the screen cloth 702 of the next area, so that the screen cloth 702 is in a stress-free lamination state when it contacts the PCB board; then the printing process in example 1 is repeated to complete the printing of the current area.

[0052] In example 3, on the basis of example 2, the dynamic linkage and precision compensation between areas are further strengthened; when the printing frame 801 and the pressing frame 803 move to the next area, the controller 9 not only calls the “tension-deformation characteristic record” of the previous area, but also dynamically corrects the pre-tilt angle of the fine adjustment cylinder 707 and the interval adjustment parameters of the stroke motor 8025 in combination with the real-time scanning data of the screen cloth 702 of the next area through the visual camera 12 to ensure that the lamination precision of the screen cloth 702 and the PCB board adapts to the actual tension distribution of the current area.

[0053] During the scraping process of the scraping plate 802, the angle encoder 705 and the monitoring data of the visual camera 12 form a closed-loop feedback: the change of the inclination angle captured by the angle encoder 705 triggers the high-frequency shooting of the line displacement by the visual camera 12, and the controller 9 adjusts the angle of the screen frame 701 more accurately through fine adjustment of the air cylinder 707 according to the linkage data of the two, while the pressure monitoring of the linear displacement sensor 805 and the adjustment of the air cylinder extension amount form a secondary closed loop, further reducing the risk of deformation caused by pressure fluctuation; through the above multi-layer closed-loop control, the regional printing process in Example 2 is repeatedly implemented, and finally the whole PCB board is printed in regions, ensuring the consistency of the clarity and edge alignment of each region pattern.

[0054] As shown in Figure 12 , the existing printing equipment only relies on the scraping plate 802 to press the screen cloth 702 downward during work, so that the screen cloth 702 is in a downward obtuse angle shape to fit the PCB board for printing; the two ends of the screen cloth 702 are directly connected with the screen frame 701, the initial tension is relatively large and stable, and the printing accuracy of the two end regions close to the screen frame 701 is acceptable; but when the scraping plate 802 moves to the middle part, the tension of the middle part of the screen cloth 702 gradually decays due to the distance from the screen frame 701 constraint, resulting in that the pattern on the screen cloth 702 is offset due to uneven tension, and the offset amount accumulates with the printing process, finally causing the middle region printing pattern to be blurred and the line to be deformed, especially on large-size PCB boards, the accuracy defects caused by tension decay are more obvious.

[0055] As shown in Figure 13 , the present application solves the above problems through the cooperative design of the scraping plate 802 and the lower pressing plate 808: the two synchronously press the screen cloth 702 to form an independent regional printing space between them. The scraping plate 802 and the lower pressing plate 808 respectively form stable constraints on the screen cloth 702 at both ends of the region, and through the interval design, the large-size screen cloth 702 is divided into multiple small regions, so that the tension of the screen cloth 702 in each sub-region remains uniform and stable-avoiding the problem of insufficient tension in the middle region of the existing equipment, and ensuring that the screen cloth 702 is tightly fitted to the PCB board through the synchronous pressure of the two; when the scraping plate 802 scrapes the ink in the region, the lower pressing plate 808 remains fixed to stabilize the tension of the screen cloth 702, effectively preventing pattern offset and blurring, realizing high-precision printing of each sub-region, especially suitable for large-size PCB boards combined by multiple units, and structurally ensuring the consistency of full-board printing; further enhance the stability through the angle fine adjustment of the screen frame 701: the fine adjustment air cylinder 707 drives the screen frame 701 to adjust the angle through the side sliding rod 708, and the angle encoder 705 detects the inclination of the screen frame 701 and the screen cloth 702 in real time and feeds back to the controller 9, which can dynamically compensate for the tension difference in the sub-region caused by the change of the scraping pressure.

[0056] The above is the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles described in the present application, can also be made several improvements and refinements, these improvements and refinements should also be considered the scope of protection of the present application.

Claims

1. A carbon ink text area printing device, comprising: A frame and a lifting platform arranged on the frame, wherein a workbench is fixed above the frame, characterized in that it also includes: The lifting seat is fixed on the lifting platform; the driving part is fixed on the lifting seat; the guide rail is fixed inside the lifting seat; the screen part is fixed on both sides of the lifting seat; the printing part is slidably set on the guide rail; the controller is fixed on the top of the frame; the start and stop button is fixed on the top of the frame; the positioning plate is fixed on the workbench; The limiting hole is provided on the guide rail; The screen frame is located directly above the workbench; the mesh is fixed in the screen frame; the rotating plate seat is fixed on both sides of the screen frame; the seat rotating rod is rotatably set on the rotating plate seat; the angle encoder is fixed on the rotating plate seat; the side plates are fixed on both sides of the lifting seat; the fine-tuning cylinder is fixed on the side plates and is used to work with the angle encoder to detect the tilt angle of the mesh; The printing frame is slidably arranged on the lifting seat; the scraper is located below the printing frame and above the workbench; the lower pressure frame is slidably arranged on the lifting seat; the stroke plate is fixed on the lower pressure frame at one end and slides through the printing frame at the other end and is arranged perpendicular to the printing frame; the linear displacement sensor is fixed above the printing frame and the lower pressure frame; the lower pressure cylinder is fixed on the lower pressure frame; the lower pressure slide is fixed on the telescopic end of the lower pressure cylinder at the top and slides through the lower pressure frame at the bottom and is slidably inserted into the linear displacement sensor; the lower pressure plate is fixed below the lower pressure slide and is used to cooperate with the scraper, angle encoder and fine-tuning cylinder to improve the tension stability of the mesh; Visual cameras are fixed at both ends of the travel plate.

2. The carbon ink text area printing device according to claim 1, characterized in that: The printed part also includes: The printing card seat is fixed on the printing frame on one side and is slidably inserted in the lifting seat on the other side; the printing slide block is fixed on the printing card seat on one side and is slidably set on the guide rail on the other side; the scraper cylinder is fixed on the printing frame; the scraper slide bar is fixed on the telescopic end of the scraper cylinder at the top, slides through the printing frame, and is fixed on the scraper plate at the bottom; the ink return cylinder is fixed on the printing frame; the ink return curved frame is fixed on the telescopic end of the ink return cylinder at the top, and is slidably sleeved on the scraper slide bar at the top; the ink return scraper is fixed below the ink return curved frame.

3. The carbon ink text area printing device according to claim 2, characterized in that: The printed part also includes: The pressing base is fixed on the pressing frame on one side and is slidably inserted in the lifting base on the other side; the pressing slider is fixed on the pressing base on one side and is slidably set on the guide rail on the other end; the clamping hole is opened on the pressing slider; the limit head is slidably set in the clamping hole and is slidably inserted in the limit hole; the spring ring is fixed in the clamping hole; the reset spring is fixed on the limit head on one end and is fixed on the spring ring on the other end; the electromagnet is fixed in the clamping hole.

4. The carbon ink text area printing device according to claim 3, characterized in that: The printed part also includes: The stroke groove is provided below the stroke plate; the stroke gear set is fixed in the stroke groove; the stroke motor is fixed in the printing frame; the stroke gear is fixed on the output end of the stroke motor and meshes with the stroke gear set.

5. The carbon ink text area printing device according to claim 1, characterized in that: The screen piece also includes: The side sliding rod slides through the side vertical plate, is fixed on the telescopic end of the fine-tuning cylinder at the top, and is fixed on the seat rotating rod at the bottom.

6. The carbon ink text area printing device according to claim 1, characterized in that: The lifting platform comprises: The lifting base is fixed on the frame at the bottom; the lifting power assembly is fixed in the lifting base; the lifting plate is fixed on the lifting power assembly; the lifting linkage rod has both ends fixed on the lifting plate, and the side away from the lifting plate is fixed on the lifting base.

7. The carbon ink text area printing device according to claim 1, characterized in that: The driving member includes: The sprocket pair is rotatably arranged on both sides of the lifting seat; the driving motor is fixed on the lifting seat, and the output end is fixed on the sprocket pair; the chain belt has both ends sleeved on the sprocket pair; the chain clamp has one end fixed on the chain belt and the other end fixed on the printing slider.

8. A printing method using the carbon ink text area printing device according to any one of claims 1 to 7, characterized in that: The steps are as follows: S1. A worker places the PCB (printing surface) on a workbench, aligning the upper left corner of the PCB with the positioning plate. The controller activates the visual camera to scan the entire mesh, identifying areas of weak tension at the mesh edge and key lines in the pre-set pattern. The camera also records the position of the PCB's printing baseline. S2. An angle encoder detects the initial tilt angle of the mesh as it naturally falls, and a linear displacement sensor simultaneously obtains the initial spacing between the squeegee and the lower platen. Data from both the angle encoder and the linear displacement sensor are transmitted to the controller. S3. Based on the weak tension area identified in S1, the controller drives the stroke motor to adjust the distance between the squeegee and the lower pressure plate to the strong tension area of ​​the mesh to avoid deformation caused by insufficient tension. At the same time, combined with the tilt angle data from S2, the controller fine-tunes the cylinder to adjust the angle of the screen frame to align the key pattern lines of the mesh with the printed reference line of the PCB board, completing the pre-printing calibration.

9. The printing method of the carbon ink text area printing device according to claim 8, characterized in that: The steps are as follows: S4. Start the scraping cylinder and the pressing cylinder, so that the scraper and the pressing plate simultaneously press the mesh down and adhere it to the printed surface of the PCB board. When the scraper begins to scrape the ink, the angle encoder captures the change in the mesh's tilt angle caused by the force in real time, and the visual camera simultaneously captures the pattern lines at the current scraping position. S5. The controller compares the real-time lines captured in S4 with the initial lines in S1. If the offset exceeds the preset value, the controller immediately adjusts the screen frame angle in the opposite direction of the offset using the fine-tuning cylinder until the line offset returns to within the tolerance range. During the adjustment process, the linear displacement sensor monitors the pressure of the scraper and the lower pressure plate on the mesh in real time. If the pressure fluctuation exceeds the stable range, the controller will simultaneously fine-tune the expansion and contraction of the scraper cylinder and the lower pressure cylinder to maintain uniform contact pressure on the mesh and avoid secondary deformation.

10. The printing method of the carbon ink text area printing device according to claim 9, characterized in that: The steps are as follows: S7. After the current area is printed, the squeegee and lower pressure plate are lifted. At the moment the mesh is separated from the PCB, the visual camera captures the mesh's rebound state and records the rebound direction and amplitude. S8. The controller associates the rebound data from S7 with the adjustment parameters of the fine-tuning cylinder during printing of the area, generates a "tension-deformation characteristic record" for the area, and stores it in the device memory. Before the printing frame and lower pressing frame move to the next area via the guide rails, the controller calls the feature record of S8 and pre-tilts the screen frame in the opposite direction of rebound using a fine-tuning cylinder to offset the mesh's rebound inertia. Simultaneously, the stroke motor adjusts the gap between the squeegee and lower pressing plate to match the mesh tension characteristics of the next area, ensuring a stress-free fit when the mesh contacts the PCB. Repeating S4-S8 completes full-board printing in separate areas.

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