Carbon oil letter subarea printing device and method thereof

Abstract

The present application relates to printing equipment technical field, disclose a kind of carbon oil character subarea printing equipment and method thereof, including: rack and setting lifting platform on rack, the workbench is fixed on rack top, further include: lifting seat, fixed on lifting platform;Driving element, fixed on lifting seat;Guide rail, fixed in lifting seat;Screen element, fixed on the both sides of lifting seat;Printing element, slidingly disposed on guide rail;Controller, fixed on rack top;Start-stop button, fixed on rack top;Positioning plate, fixed on workbench;Limiting hole, open in guide rail;Screen frame, located just above workbench;Mesh cloth, fixed in screen frame;Rotary plate seat, fixed on both sides of screen frame;The present application is cooperated by guide rail, printing frame, downholder and stroke motor, glue scraping plate and downholder are pressed mesh cloth together, realize subarea accurate printing;Again through glue scraping plate, downholder, fine adjustment cylinder and angle encoder synergic promotion mesh cloth tension stability.

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 further stretches the screen cloth, causing the tension of the middle region to continuously decay, and the pattern shift gradually accumulates as the rubber blade moves. 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 edges, line deformation and even unit misalignment, 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: blurred characters may cause difficulty in subsequent process recognition, and 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 standards, 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 industry's demand for high-reliability and high-consistency printing processes. 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:

[0007] 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:

[0008] The lifting seat is fixed on the lifting table; the driving member is fixed on the lifting seat; the guide rail is fixed in the lifting seat; the screen member is fixed on both sides of the lifting seat; the printing member 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;

[0009] The limiting hole is arranged on the guide rail.

[0010] 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 rod 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.

[0011] 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 arranged vertically 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.

[0012] The stroke plate is fixed with a visual camera at both ends.

[0013] Further, the printing member further comprises:

[0014] 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.

[0015] Further, the printing member further comprises:

[0016] 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.

[0017] 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.

[0018] Further, the screen element further comprises:

[0019] 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.

[0020] Further, the lifting platform comprises:

[0021] A lifting base is fixed on the lower end of 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 on both ends of the lifting plate and on the side away from the lifting plate.

[0022] Further, the driving element comprises:

[0023] 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.

[0024] In a second aspect, a printing method of a carbon oil character regional printing device is provided, and the method steps are as follows:

[0025] 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;

[0026] 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 rubber plate and the lower pressing plate. The data of the angle encoder and the linear displacement sensor are transmitted to the controller.

[0027] S3. The controller drives the stroke motor to adjust the interval between the rubber plate and the lower 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.

[0028] Further, the method steps are as follows:

[0029] S4. Start the glue scraping cylinder and the pressing cylinder, so that the glue scraping plate and the pressing plate press the screen cloth and the PCB board at the same time; when the glue scraping plate starts to scrape the ink, the angle encoder captures the change of the inclination angle of the screen cloth in real time, and the visual camera synchronously captures the pattern lines of the current scraping position in real time.

[0030] S5. The controller compares the real-time lines captured in S4 with the initial lines in S1, and when the offset exceeds the preset value, immediately adjusts the screen frame angle in the opposite direction through the fine adjustment cylinder until the line offset returns to the tolerance range.

[0031] S6. During the adjustment process, the linear displacement sensor monitors the pressure value of the screen cloth pressed by the glue scraping plate and the pressing plate in real time, and when the pressure fluctuation exceeds the stable range, the controller synchronously adjusts the extension amount of the glue scraping cylinder and the pressing cylinder to maintain the uniform contact pressure of the screen cloth and avoid secondary deformation.

[0032] Further, the method steps are as follows:

[0033] S7. After the current area is printed, the glue scraping plate and the pressing plate are lifted, and the visual camera captures the rebound state of the screen cloth at the moment when the screen cloth and the PCB board are separated, and records the rebound direction and amplitude.

[0034] 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.

[0035] S9. Before the printing frame and the 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 spacing between the glue scraping plate and the 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 state when it contacts the PCB board, and the steps S4-S8 are repeated to complete the full-board area printing.

[0036] The above scheme of the application at least has the following beneficial effects:

[0037] The present application realizes precise printing in different areas by cooperating guide rail, printing frame, pressing frame and stroke motor, and pressing screen cloth together with scraping plate and pressing plate: the guide rail provides a stable path for movement, the stroke motor drives the stroke gear to engage with the stroke gear set, and the interval between the scraping plate and the pressing plate is accurately adjusted to adapt to the area tension; cooperating with the initial positioning of the positioning plate on the PCB board solves the problem of deviation of the middle area in traditional equipment, and guarantees the printing accuracy of each area of the large-size multi-unit PCB board; then the scraping plate, the pressing plate, the fine adjustment cylinder and the angle encoder cooperate to improve the stability of the screen cloth tension: the two are pressed synchronously to form a flat area, avoiding collapse due to insufficient tension in the middle; the fine adjustment cylinder drives the screen frame to tilt through the side slide rod, and the angle encoder detects the inclination in real time and feeds back to the controller, dynamically compensating for the tension difference, offsetting the deformation of the scraping pressure, preventing the pattern of the screen cloth from deforming, and ensuring the clarity.

[0038] 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 area and lines of the screen cloth tension, the linear displacement sensor monitors the pressure change, and after the data is transmitted to the controller, the scraping cylinder and the pressing cylinder are triggered to adjust the extension amount, ensuring uniform contact pressure of the screen cloth, avoiding secondary deformation, adapting to the flatness of different PCB boards, and improving the flexible production capacity; then through the controller, the visual camera and the "tension-deformation characteristic record" mechanism, cross-area dynamic compensation is realized: after the current area is printed, the visual camera records the rebound state of the screen cloth, and 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 through the fine adjustment cylinder to drive the screen frame to counter-tilt to offset the rebound inertia, and the stroke motor adjusts the interval between the scraping plate and the pressing plate, ensuring that the screen cloth has no stress when it contacts the PCB board, guaranteeing the consistency of the pattern clarity and the edge alignment, and adapting to batch multi-area printing. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A first perspective overall structure schematic diagram of a carbon oil character sub-area printing equipment provided by the embodiment of the present application is provided.

[0040] Figure 2 A second perspective overall structure schematic diagram of a carbon oil character sub-area printing equipment provided by the embodiment of the present application is provided.

[0041] Figure 3 A lifting seat structure schematic diagram of a carbon oil character sub-area printing equipment provided by the embodiment of the present application is provided.

[0042] Figure 4 A chain belt structure schematic diagram of a carbon oil character sub-area printing equipment provided by the embodiment of the present application is provided. Figure 3 An enlarged view of A of the carbon oil character sub-area printing equipment provided by the embodiment of the present application is provided.

[0043] Figure 5 A chain belt structure schematic diagram of a carbon oil character sub-area printing equipment provided by the embodiment of the present application is provided.

[0044] Figure 6 A carbon oil character sub-region printing equipment provided by the embodiment of the present application Figure 5 An enlarged view of B of the carbon oil character sub-region printing equipment provided by the embodiment of the present application

[0045] Figure 7 A stroke motor structure schematic diagram of the carbon oil character sub-region printing equipment provided by the embodiment of the present application

[0046] Figure 8 A limit head structure schematic diagram of the carbon oil character sub-region printing equipment provided by the embodiment of the present application

[0047] Figure 9 A printing frame structure schematic diagram of the carbon oil character sub-region printing equipment provided by the embodiment of the present application

[0048] Figure 10 A down-press frame structure schematic diagram of the carbon oil character sub-region printing equipment provided by the embodiment of the present application

[0049] Figure 11 A printing flow schematic diagram of the carbon oil character sub-region printing equipment provided by the embodiment of the present application

[0050] Figure 12 A general printing simple schematic diagram of the existing equipment provided by the embodiment of the present application

[0051] Figure 13 A sub-region printing simple schematic diagram provided by the embodiment of the present application

[0052] Explanation of reference signs:

[0053] In the diagram: 1. Frame; 2. Lifting platform; 201. Lifting base; 202. Lifting power assembly; 203. Lifting plate; 204. Lifting linkage rod; 3. Worktable; 4. Lifting seat; 5. Drive component; 501. Sprocket pair; 502. Drive motor; 503. Chain belt; 504. Chain clamp plate; 6. Guide rail; 601. Limiting hole; 7. Screen plate component; 701. Screen frame; 702. Screen cloth; 703. Rotating plate seat; 704. Seat rotating rod; 705. Angle encoder; 706. Side plate; 707. Fine-tuning cylinder; 708. Side slide rod; 8. Printed part; 801. Printing rack; 802. Squeegee; 803. Lower pressure frame; 804. Stroke plate; 805. Linear displacement transmission. Sensor; 806, Pressing cylinder; 807, Pressing slide bar; 808, Pressing plate; 809, Printing holder; 8010, Printing slider; 8011, Squeegee cylinder; 8012, Squeegee slide bar; 8013, Ink return cylinder; 8014, Ink return frame; 8015, Ink return scraper; 8016, Pressing holder; 8017, Pressing slider; 8018, Squeegee hole; 8019, Limit head; 8020, Spring ring; 8021, Return spring; 8022, Electromagnet; 8023, Stroke groove; 8024, Stroke gear assembly; 8025, Stroke motor; 8026, Stroke gear; 9, Controller; 10, Start / Stop button; 11, Positioning plate; 12, Vision camera. Detailed Implementation

[0054] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0055] like Figures 1 to 10 As shown, an embodiment of the present invention provides a carbon ink text area printing device, including: a frame 1 and a lifting platform 2 disposed on the frame 1, a worktable 3 fixed above the frame 1, and further including: a lifting seat 4 fixed on the lifting platform 2; a driving component 5 fixed on the lifting seat 4; a guide rail 6 fixed inside the lifting seat 4; a screen 7 fixed on both sides of the lifting seat 4; a printing component 8 slidably disposed on the guide rail 6; a controller 9 fixed above the frame 1; a start / stop button 10 fixed above the frame 1; a positioning plate 11 fixed on the worktable 3; and vision cameras 12 fixed at both ends of a travel plate 804.

[0056] The limiting hole 601 is arranged on the guide rail 6; the mesh frame 701 is located directly above the workbench 3; the mesh cloth 702 is fixed in the mesh frame 701; the rotating plate seat 703 is fixed on both sides of the mesh frame 701; the seat rotating rod 704 is rotatably arranged on the rotating plate seat 703; the angle encoder 705 is fixed on the rotating plate seat 703; the side vertical plate 706 is fixed on both sides of the lifting seat 4; the fine adjustment air cylinder 707 is fixed on the side vertical plate 706 and is used for cooperating with the angle encoder 705 to detect the inclination angle of the mesh cloth 702; the printing frame 801 is slidably arranged on the lifting seat 4; the glue scraping plate 802 is located below the printing frame 801 and above the workbench 3; the pressing frame 803 is slidably arranged on the lifting seat 4; the stroke plate 804 is fixed at one end on the pressing frame 803 and is slidably penetrated through the printing frame 801 and is vertically arranged with the printing frame 801; the linear displacement sensor 805 is fixed above the printing frame 801 and the pressing frame 803; the pressing cylinder 806 is fixed on the pressing frame 803; the pressing slide rod 807 is fixed at the upper end of the telescopic end of the pressing cylinder 806, is slidably penetrated through the pressing frame 803 and is slidably inserted into the linear displacement sensor 805; the pressing plate 808 is fixed below the pressing slide rod 807 and is used for cooperating with the glue scraping plate 802, the angle encoder 705 and the fine adjustment air cylinder 707 to improve the tension stability of the mesh cloth 702.

[0057] Specifically, the mesh frame 701 can adjust the inclination angle, and the angle range is 0-3°; the mesh cloth 702 is used for covering on the PCB board; the glue scraping plate 802 is arranged in an inclined manner, facilitating ink scraping; 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; 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.

[0058] As a preferred embodiment of the present application, the printing part 8 further comprises: a printing card seat 809, one side of which is fixed on the printing frame 801 and the other side of which is slidably inserted into the lifting seat 4; a printing slide block 8010, one side of which is fixed on the printing card seat 809 and the other side of which is slidably arranged on the guide rail 6; a glue scraping cylinder 8011 fixed on the printing frame 801; a glue scraping slide rod 8012, the upper end of which is fixed on the telescopic end of the glue scraping cylinder 8011, is slidably penetrated through the printing frame 801 and is fixed on the glue scraping plate 802 at the lower end; an ink returning cylinder 8013 fixed on the printing frame 801; an ink returning curved frame 8014, the upper end of which is fixed on the telescopic end of the ink returning cylinder 8013 and is slidably sleeved on the glue scraping slide rod 8012 at the upper end; and an ink returning scraping plate 8015 fixed below the ink returning curved frame 8014.

[0059] The printing piece 8 further comprises: a pressing holder 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 holder 8016 and slidably arranged on the guide rail 6 on the other end; 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 having one end fixed on the limiting head 8019 and the other end fixed on the spring ring 8020; and an electromagnet 8022 fixed in the clamping hole 8018.

[0060] The printing piece 8 further comprises: a stroke slot 8023 arranged below a 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 wheel 8026 fixed on an output end of the stroke motor 8025 and engaged with the stroke gear set 8024.

[0061] Specifically, the ink scraping plate 8015 is arranged in an inclined state to scrape the ink back to the original position.

[0062] As a preferred embodiment of the present application, the screen piece 7 further comprises: a side sliding rod 708 slidably penetrating through the side stand 706, fixed on the telescopic end of the fine adjustment air cylinder 707 on the upper side, and fixed on the seat rotating rod 704 on the lower side.

[0063] The lifting table 2 comprises: a lifting base 201 fixed on the lower side of the rack 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 having two ends fixed on the lifting plate 203 and fixed on the lifting seat 4 on the side away from the lifting plate 203.

[0064] As a preferred embodiment of the present application, the driving piece 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 having an output end fixed on the chain wheel pair 501; a chain belt 503 having two ends sleeved on the chain wheel pair 501; and a chain clamping plate 504 having one end fixed on the chain belt 503 and the other end fixed on the printing slider 8010.

[0065] Specifically, the driving motor 502 provides rotating power for the chain belt 503, and the chain clamping plate 504 is connected to the printing slider 8010 of the printing holder 809, so as to facilitate the movement of the printing frame 801 in the lifting seat 4.

[0066] The working principle is that when the worker performs the printing operation, the PCB to be printed is placed with the surface to be printed facing upward, and the upper left corner of the PCB is precisely docked 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, thereby driving 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.

[0067] 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 tightly attached to the surface to be printed of the PCB, and a stable interval is formed between the glue scraping plate 802 and the pressing plate 808, and a flat printing area is constructed.

[0068] The electromagnet 8022 and the stroke motor 8025 are started to enter the working state; after the electromagnet 8022 is started, a magnetic force is generated 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 is compressed by 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 pressing frame 803 to move away from the printing frame 801, until the pressing frame 803 reaches the set position, the interval between the glue scraping plate 802 and the pressing plate 808 is accurately adjusted by the cooperation of the stroke motor 8025 and the guide rail 6, so as to adapt to the characteristics of the current printing area; the electromagnet 8022 stops working, the return spring 8021 drives the limiting head 8019 to reset, the limiting head 8019 is reinserted into another limiting hole 601 in the guide rail 6, and the positioning of the pressing frame 803 is completed; the pressing cylinder 806 is started, and the telescopic end of the pressing cylinder 806 performs a retraction action, which drives the pressing slide rod 807 to move downward, and the displacement of the pressing slide rod 807 drives the pressing plate 808 to displace downward, until the pressing plate 808 presses the mesh cloth 702, so that the mesh cloth 702 is also tightly attached to the surface to be printed of the PCB.

[0069] The position where the glue scraping plate 802 presses the screen cloth 702 to be attached to the PCB to be printed, and the position where the pressing plate 808 presses the screen cloth 702 to be attached to the PCB to be printed, the screen cloth 702 between the two positions will be in a flat state and attached to the printed surface of the PCB. 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, and thus ensure that the printed pattern is clearer, thereby physically ensuring 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 pressing plate 808.

[0070] The pressing plate 808 and the glue scraping plate 802 press the screen cloth 702 to be attached to the PCB to form a stable printing basis for the PCB area; the glue scraping plate 802 scrapes the ink to the right, and the pressing plate 808 remains stationary to ensure that the screen cloth 702 is stable in tension during the PCB area printing process, avoid pattern shift caused by movement, and ensure uniform contact pressure through the synchronous action of the two, thereby improving the edge alignment of each unit in the sub-area printing. When the printing area pattern is completed, the pressing plate 808 and the glue scraping plate 802 will be lifted together and separated from the screen cloth 702; then the movable printing frame 801 and the pressing frame 803 drive the pressing plate 808 and the glue scraping plate 802 to move to the next preset area, realizing precise printing of the whole PCB in sub-areas; according to the actual whole PCB, the sub-area position is selected, and the deformation amount is compensated in sub-areas in the design, which is more accurate, and the interval design provides a stable mechanical basis for the deformation amount compensation in sub-areas; 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, and thus ensure that the printed pattern is clearer.

[0071] Start the driving motor 502, and 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 towards the pressing frame 803, and in the process of moving the printing frame 801, the glue scraping plate 802 is scraped on the screen cloth 702; the travel plate 804 of the pressing frame 803 is slidingly connected with the printing frame 801, the limiting head 8019 of the pressing frame 803 is inserted into the limiting hole 601 of the guide rail 6, and the pressing frame 803 is fixed on the guide rail 6 to ensure the stability of the scraping operation, and at the same time, the whole PCB can be printed in sub-areas, and the interval design and the synchronous action further improve the printing accuracy in sub-areas.

[0072] During the scraping process of the glue scraping plate 802 on the screen cloth 702, the fine adjustment cylinders 707 on both sides of the lifting seat 4 are started, the telescopic ends of the two fine adjustment cylinders 707 are retracted to different degrees, the side slide rod 708 is 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 slide rod 708, which dynamically adapts to the tension difference of different regions and compensates the uneven tension of the edge and the middle region; the angle encoder 705 installed on the rotating plate seat 703 detects the rotation 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 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 change of scraping pressure in real time.

[0073] The two fine adjustment cylinders 707 drive the side slide rod 708 to displace by different degrees, so that the screen frame 701 and the screen cloth 702 form an adaptive inclined state. This adjustment is not a fixed mode, but combines the real-time detection of the rotation angle of the seat rotating rod 704 by the angle encoder 705 to accurately capture the slight deformation of the screen cloth 702 caused by the change of scraping pressure and tension, and to adjust the angle in real time to offset the deformation influence, thereby avoiding the problem of "deformation accumulation of the screen cloth 702 during the scraping process leading to printing deviation" in traditional equipment. 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 difference in flatness of the PCB board. The differential telescoping of the fine adjustment cylinders 707 can adjust the inclination angle of the screen cloth 702 according to the characteristics of the current scraping region, compensate for the deformation amount of different regions, and make the state of the screen cloth 702 in each region accurately match the scraping action of the glue scraping plate 802. The linkage of the deformation amount compensation of different 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 printed patterns in each region.

[0074] After the scraping operation of the glue scraping plate 802 on the screen cloth 702 is completed, the glue scraping cylinder 8011 and the pressing cylinder 806 are started, the extension ends of the glue scraping cylinder 8011 and the pressing cylinder 806 move upward, the glue scraping plate 802 and the pressing plate 808 no longer press the screen cloth 702; the ink returning cylinder 8013 is started, the extension end of the ink returning cylinder 8013 extends out, drives the ink returning frame 8014 to move downward, the ink returning 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 pressing frame 803 is reset, the electromagnet 8022 is started to attract the limiting head 8019 to separate from the clamping hole 8018, the stroke motor 8025 is started in reverse, drives the stroke plate 804 and the pressing frame 803 to reset; the lifting power assembly 202 is started, drives the lifting plate 203, the lifting linkage rod 204 and the lifting seat 4 to move upward, and the overall reset is completed.

[0075] After the printing operation is completed, the worker takes the PCB board from the workbench 3, replaces a new PCB board, and repeats the above operation to perform the next printing; during the whole process, the worker can set various parameters of the printing equipment through the controller 9, presses the start-stop button 10 to start a complete printing process, and the equipment automatically stops and resets after printing is completed; in an emergency, the stop button is pressed to make the equipment stop working in an emergency. The interval design of the glue scraping plate 802 and the pressing plate 808 and the cooperation of the angle adjusting mechanism of the screen frame 701 continuously guarantee the printing quality and the flexible production capacity of the equipment during the process.

[0076] As shown in Figure 11 The embodiment of the present application provides a printing method of a carbon oil character regional printing equipment, and the method steps are as follows:

[0077] S1. The worker places the PCB board to be printed on the workbench 3 with the printing surface upward, so that the upper left corner of the PCB board is accurately connected with the positioning plate 11; the controller 9 starts the visual camera 12 to scan the whole domain of the screen cloth 702, identifies the edge tension weak area and the key line position of the preset pattern of the screen cloth 702, and records the printing reference line position of the PCB board at the same time;

[0078] 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 obtains the initial interval of the glue scraping plate 802 and the pressing plate 808, and the data of the angle encoder 705 and the linear displacement sensor 805 are transmitted to the controller 9;

[0079] S3. The controller 9 drives the stroke motor 8025 to adjust the interval between the squeegee plate 802 and the lower plate 808 according to the weak tension area identified in S1, corresponding to the strong tension area of the mesh cloth 702 to avoid deformation caused by insufficient tension; at the same time, combined with the inclination angle data in S2, the mesh frame 701 angle is adjusted by the fine adjustment cylinder 707 to align the key pattern lines on the mesh cloth 702 with the PCB printing reference line, completing the pre-printing calibration.

[0080] Specifically, before printing, the staff places the PCB to be printed face up on the workbench 3, and the upper left corner of the PCB is precisely connected with the positioning plate 11 to fix the position; the controller 9 starts the visual camera 12 to scan the mesh cloth 702 globally to identify the weak tension area of the edge of the mesh cloth 702 and the key line position of the preset pattern, and simultaneously records the printing reference line position of the PCB, providing a reference for subsequent calibration; the angle encoder 705 detects the initial inclination angle of the mesh cloth 702 in the natural falling state, and the linear displacement sensor 805 synchronously obtains the initial interval between the squeegee plate 802 and the lower plate 808, which are all transmitted to the controller 9 in real time; the controller 9 adjusts the interval between the squeegee plate 802 and the lower plate 808 based on the aforementioned identified weak tension area through the driving stroke motor 8025, so that the two correspond to the strong tension area of the mesh cloth 702, avoiding deformation caused by insufficient tension; at the same time, combined with the detected initial inclination angle, the mesh frame 701 angle is adjusted by the fine adjustment cylinder 707 to ensure that the key pattern lines on the mesh cloth 702 are aligned with the printing reference line of the PCB, completing the pre-printing calibration work.

[0081] A printing method of a carbon oil character regional printing device, the method steps are as follows:

[0082] S4. Start the squeegee cylinder 8011 and the lower cylinder 806 to synchronously press the mesh cloth 702 and the PCB to be printed face with the squeegee plate 802 and the lower plate 808; when the squeegee plate 802 starts to scrape the ink, the angle encoder 705 captures the inclination angle change of the mesh cloth 702 caused by the force in real time, and the visual camera 12 synchronously dynamically captures the pattern lines at the current squeegee position;

[0083] S5. The controller 9 compares the real-time lines captured in S4 with the initial lines in S1, and when the offset exceeds the preset value, immediately adjusts the mesh frame 701 angle in the opposite direction of the offset by the fine adjustment cylinder 707 until the line offset returns to the tolerance range.

[0084] S6. During the adjustment process, the linear displacement sensor 805 monitors the pressure value of the squeegee plate 802 and the lower plate 808 on the mesh cloth 702 in real time, and when the pressure fluctuation exceeds the stable range, the controller 9 synchronously fine adjusts the extension amount of the squeegee cylinder 8011 and the lower cylinder 806 to maintain the uniform contact pressure of the mesh cloth 702, avoiding secondary deformation.

[0085] Specifically, during printing, 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 synchronously, so as to ensure that the screen cloth 702 is tightly attached to the surface of the PCB 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 in real time, and the visual camera 12 synchronously captures the pattern lines at the current scraping position; the controller 9 compares the lines captured in real time with the initial lines recorded in S1, 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 once the pressure fluctuation exceeds the stable range, the controller 9 will synchronously fine-tune the extension amount 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 caused by unstable pressure.

[0086] A printing method of a carbon oil character regional printing device, the method steps are as follows:

[0087] S7. After the current region is printed, 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 is separated from the PCB, and records the rebound direction and amplitude;

[0088] 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 a “tension-deformation characteristic record” of the region, and stores it in the device memory;

[0089] S9. Before the printing frame 801 and the pressing frame 803 move to the front of the next region through the guide rail 6, the controller 9 calls the characteristic record of S8 to pre-tilt 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 region, so that the screen cloth 702 is in a stress-free attachment state when it contacts the PCB, and the steps S4-S8 are repeated to complete the full-board regional printing.

[0090] Specifically, after the current area printing is completed, the squeegee plate 802 and the lower 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 squeegee plate 802 and the lower 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.

[0091] 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 squeegee plate 802 and the lower 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 squeegee plate 802 and the lower 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.

[0092] 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.

[0093] 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.

[0094] Before the printing frame 801 and the pressing frame 803 are moved 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.

[0095] 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 are moved 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.

[0096] 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.

[0097] 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.

[0098] 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 caused by the change of scraping pressure in the sub-region.

[0099] 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 oil letter subarea printing apparatus comprising: The rack and the lifting platform arranged on the rack, the workbench is fixed above the rack, characterized in that further comprising: Lifting seat, fixed on the lifting platform; driving piece, fixed on the lifting seat; guide rail, fixed in the lifting seat; screen frame, fixed on both sides of the lifting seat; printing piece, slidingly arranged on the guide rail; controller, fixed above the rack; start-stop button, fixed above the rack; positioning plate, fixed on the workbench; Limiting hole, opening in the guide rail; Screen frame, located directly above the workbench; screen cloth, fixed in the screen frame; rotating plate seat, fixed on both sides of the screen frame; seat rotating rod, rotatingly arranged on the rotating plate seat; angle encoder, fixed on the rotating plate seat; side stand, fixed on both sides of the lifting seat; fine adjustment cylinder, fixed on the side stand, used for working with the angle encoder to detect the screen cloth tilt angle; Printing frame, slidingly arranged on the lifting seat; glue scraping plate, located below the printing frame and above the workbench; pressing frame, slidingly arranged on the lifting seat; stroke plate, one end fixed on the pressing frame, the other end slidingly penetrating through the printing frame and vertically arranged with the printing frame; linear displacement sensor, fixed above the printing frame and the pressing frame; pressing cylinder, fixed on the pressing frame; pressing slide rod, fixed on the extension end of the pressing cylinder at the top, slidingly penetrating through the pressing frame at the bottom and slidingly inserted into the linear displacement sensor; pressing plate, fixed below the pressing slide rod, used for cooperating with the glue scraping plate, the angle encoder and the fine adjustment cylinder to improve the screen cloth tension stability; Both ends of the stroke plate are fixed with visual cameras; The method steps are as follows: S1. The staff places the PCB plate to be printed face up on the workbench, so that the left upper corner of the PCB plate is accurately connected with the positioning plate; the controller starts the visual camera to scan the whole screen cloth, identifies the weak tension area of the screen cloth edge and the key line position of the preset pattern, and records the PCB plate printing reference line position at the same time; S2. The angle encoder detects the initial tilt angle of the screen cloth when it naturally falls, and the linear displacement sensor synchronously obtains the initial distance between the glue scraping plate and the pressing plate, and 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 interval between the glue scraping plate and the pressing plate according to the weak tension area identified in S1, so as to avoid the deformation caused by insufficient tension corresponding to the strong tension area of the screen cloth; at the same time, the angle of the screen frame is adjusted by the fine adjustment cylinder according to the tilt angle data in S2, so that the key pattern line of the screen cloth is aligned with the PCB plate printing reference line, and the pre-printing calibration is completed; S4. Start the glue scraping cylinder and the pressing cylinder to make the glue scraping plate and the pressing plate press the screen cloth and the PCB plate to be printed at the same time; when the glue scraping plate starts to scrape the ink, the angle encoder captures the tilt angle change of the screen cloth 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 captured in S4 with the initial line in S1, and when the offset exceeds the preset value, immediately adjusts the angle of the screen frame to the opposite direction of the offset by the fine adjustment cylinder until the line offset returns to the tolerance range. S6. During the adjustment process, the linear displacement sensor monitors the pressure value of the glue scraping plate and the pressing plate on the mesh cloth in real time. If the pressure fluctuation exceeds the stable range, the controller synchronously adjusts the extension and retraction amount of the glue scraping cylinder and the pressing cylinder to maintain the uniform contact pressure of the mesh cloth and avoid secondary deformation.

2. The carbon oil letter subarea printing apparatus according to claim 1, wherein The printing device further comprises: The printing device further comprises:

3. The carbon oil letter subarea printing apparatus according to claim 2, wherein The printing device further comprises: The printing device further comprises:

4. The carbon oil letter subarea printing apparatus according to claim 3, wherein The printing device further comprises: The printing device further comprises:

5. The carbon oil letter subarea printing apparatus according to claim 1, wherein S7. After the current area printing is completed, the glue scraping plate and the pressing plate are lifted, and the mesh cloth is separated from the PCB plate at the moment. The visual camera shoots the rebound state of the mesh cloth, records the rebound direction and amplitude; S8. The controller associates the rebound data of 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; 6. The carbon oil letter subarea printing apparatus according to claim 1, wherein S9. Before the printing frame and the pressing frame move to the next area through the guide rail, the controller calls the characteristic record of S8, pre-tilts the mesh frame in the opposite direction of the rebound in advance through the fine adjustment cylinder to offset the rebound inertia of the mesh cloth. At the same time, the spacing between the glue scraping plate and the pressing plate is adjusted through the stroke motor to adapt to the tension characteristics of the mesh cloth in the next area, so that the mesh cloth is in a stress-free lamination state when it contacts the PCB plate. Repeat S4-S8 to complete the full-board area printing. ​ 7. The carbon oil letter subarea printing apparatus according to claim 1, wherein ​ ​ 8. The carbon oil letter subarea printing apparatus according to claim 1, wherein ​ ​ ​ ​

Images