A fully automatic screen printing machine based on vision positioning

Abstract

This utility model discloses a fully automatic screen printing machine based on vision positioning. Its structure consists of a printhead assembly, a vision module, a transmission system, a positioning platform, and a frame. The vision module uses an industrial camera combined with a bar light source to acquire high-precision images of the substrate. Its linkage design with the printhead enables automatic alignment. The transmission system is equipped with an X / Y axis linear module driven by a servo motor and a synchronous belt drive, along with a slider guide rail structure. The array of suction holes on the surface of the positioning platform uses a negative pressure system to fix the substrate, and a cross-shaped reinforcing rib at the bottom enhances rigidity. The screen holder in the printhead assembly uses a spring-loaded plate and an adjustable squeegee holder design to adapt to diverse printing needs. The frame is equipped with adjustable feet and linear guide rails, balancing equipment installation leveling and overall structural stability. With its high precision, high stability, and modular design, this equipment is widely applicable to high-precision printing fields such as electronic components, ceramic decals, and precision circuit boards.

Description

Technical Field

[0001] This utility model relates to the field of fully automatic screen printing technology, and more specifically, to a fully automatic screen printing machine based on vision positioning. Background Technology

[0002] Screen printing is a widely used printing technology that involves stretching silk, synthetic fiber, or metal mesh onto a frame and creating a printing plate using manual etched film or photochemical methods. During printing, ink is forced through the mesh openings of the screen by a squeegee, transferring it to the substrate to form an image identical to the original artwork. Due to its ease of operation and strong adaptability, screen printing is widely used in fields such as electronic circuits, advertising signs, ceramic decals, and textile printing. With the development of industrial technology, higher demands are being placed on the precision, efficiency, and automation of screen printing, driving continuous innovation in related equipment.

[0003] Currently, most screen printing machines rely on mechanical positioning or manual visual calibration, which suffers from low positioning accuracy, low efficiency, and inability to adapt to multi-variety, small-batch production. While some existing technologies incorporate vision-assisted positioning, they suffer from drawbacks such as complex structure, poor module adjustment flexibility, and insufficient transmission stability. For example, the separate design of the vision module and the print head leads to low calibration efficiency, and the rigid connection between the linear module drive and the print head is prone to vibration errors. Therefore, there is a need for a fully automatic screen printing machine based on vision positioning to address these issues. Utility Model Content

[0004] The purpose of this invention is to provide a fully automatic screen printing machine based on vision positioning, so as to solve the problems of low positioning accuracy and low production efficiency of traditional screen printing machines mentioned in the background art.

[0005] This utility model provides a fully automatic screen printing machine based on vision positioning, including: a printing head assembly, a vision module, a transmission system, a positioning platform, and a frame; the printing head assembly is slidably connected to the guide rail via a slider; the vision module is fixed to the side of the printing head assembly via an L-shaped bracket; the transmission system includes an X / Y axis linear module, the two ends of which are bolted to the frame via flanges; the positioning platform has an array of adsorption holes on its surface, and its bottom is welded to the frame via cross reinforcing ribs.

[0006] Furthermore, the linear module of the transmission system includes a servo motor and a synchronous belt. The servo motor is directly connected to the drive wheel via a coupling, and the synchronous belt is rigidly connected to the slider via a pressure plate.

[0007] Furthermore, the printing head assembly includes a doctor blade holder and a screen holder. The doctor blade holder has elongated slots on both sides and is hinged to the screen holder via wing nuts. The screen holder has a spring pressure plate on its inner side.

[0008] Furthermore, the vision module includes an industrial camera and a bar light source. The industrial camera is horizontally adjustable on an L-shaped bracket via a slide groove, and the bar light source is coaxially fixed to the camera lens via a clip.

[0009] Furthermore, the top of the frame is provided with a linear guide rail, and the four corners of the bottom of the frame are provided with adjustable feet. The feet include M12 bolts and rubber pads, and the bolts are threaded into the threaded holes of the frame base plate.

[0010] Beneficial effects:

[0011] 1. In this invention, the vision module is equipped with an industrial camera and a bar light source, enabling real-time image acquisition of the substrate. Through its linkage design with the print head assembly, high-precision automatic alignment is achieved. Compared to traditional manual positioning, this significantly reduces the printing waste rate caused by positioning deviations, making it particularly suitable for fields with extremely high printing precision requirements, such as electronic components and precision circuit boards.

[0012] 2. In this utility model, the array of adsorption holes on the surface of the positioning platform, combined with the negative pressure system, can firmly adsorb the substrate. The cross-shaped reinforcing ribs at the bottom enhance the rigidity of the platform. With this double protection, the substrate is prevented from shifting or deforming during printing, ensuring a stable printing process and reliable quality of the printed product.

[0013] 3. In this utility model, the doctor blade holder and screen holder of the printing head assembly adopt an adjustable design. The angle and position can be flexibly adjusted through the long slot and the wing nut to adapt to screens of different thicknesses and specifications. The industrial camera in the vision module can also be adjusted laterally through the slide to adapt to diverse printing needs and improve the versatility of the equipment. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2 This is a view of the printhead assembly of this utility model;

[0016] Figure 3 This is a view of the visual module of this utility model;

[0017] Figure 4 A schematic diagram of the bottom bolt fixing of this utility model.

[0018] In the figure, the correspondence between the component names and the attached drawing numbers is as follows: Printhead assembly 1, Vision module 2, Transmission system 3, Positioning platform 4, Frame 5, L-shaped bracket 201, Array-type suction hole 401, Ink knife holder 102, Screen holder 103, Long slot 1021, Wing nut 1022, Vision module 2, Industrial camera 202, Strip light source 203, L-shaped bracket 201, Buckle 2031, Frame 5, Adjustable foot 502, Bolt 5021, Threaded hole 503. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] As attached Figure 1 To be continued Figure 4 As shown:

[0021] This embodiment provides a fully automatic screen printing machine based on vision positioning, including a printing head assembly 1, a vision module 2, a transmission system 3, a positioning platform 4, and a frame 5. The printing head assembly 1 is slidably connected to the guide rail via a slider 101. The vision module 2 is fixed to the side of the printing head assembly 1 via an L-shaped bracket 201. The transmission system 3 includes an X / Y axis linear module 301, and both ends of the module are bolted to the frame 5 via flanges 3011. The positioning platform 4 has an array of adsorption holes 401 on its surface, and its bottom is welded to the frame 5 via cross reinforcing ribs 402.

[0022] Preferably, the linear module 301 of the transmission system 3 includes a servo motor 3012 and a synchronous belt 3013. The servo motor 3012 is directly connected to the drive wheel 3015 through a coupling 3014, and the synchronous belt 3013 is rigidly connected to the slider 101 through a pressure plate 1011.

[0023] Preferably, the printing head assembly 1 includes a doctor blade holder 102 and a screen holder 103. The doctor blade holder 102 has elongated slots 1021 on both sides and is hinged to the screen holder 103 by a wing nut 1022. The screen holder 103 has a spring pressure plate 1031 on its inner side.

[0024] In a specific implementation case: the slider 101 of the printhead assembly 1 is embedded into the guide rail of the frame 5 with a clearance of 0.01mm to ensure smooth sliding; the industrial camera 202 of the vision module 2 is laterally adjusted through the slide groove 2041 of the L-shaped bracket 201 to align with the center of the printhead. The linear module 301 of the transmission system 3 is bolted to the frame 5 via flange 3011, the servo motor 3012 is directly connected to the drive wheel 3015 via coupling 3014, and the synchronous belt 3013 is rigidly connected to the slider 101 by the pressure plate 1011. The suction hole 401 of the positioning platform 4 has a diameter of 0.5mm and is connected to the vacuum system, with the bottom cross reinforcing rib 402 welded for reinforcement. The doctor blade holder 102 of the printhead assembly 1 can be adjusted in angle through the long slot 1021 and the wing nut 1022, and the spring pressure plate 1031 of the screen holder 103 presses the screen. After the circuit board is adsorbed, the vision module is positioned, and the transmission system drives the printhead to complete high-precision printing.

[0025] Preferably, the vision module 2 includes an industrial camera 202 and a bar light source 203. The industrial camera 202 is horizontally adjustable on the L-shaped bracket 201 via a slide 2041, and the bar light source 203 is coaxially fixed to the camera lens via a buckle 2031.

[0026] Preferably, the top of the frame 5 is provided with a linear guide rail 501, and the four corners of the bottom of the frame 5 are provided with adjustable feet 502. The feet 502 include M12 bolts 5021 and rubber pads 5022. The bolts 5021 are threadedly connected to the threaded holes 503 on the bottom plate of the frame 5.

[0027] In a specific embodiment: the industrial camera 202 of the vision module 2 is installed in the slide groove 2041 of the L-shaped bracket 201. By tightening the fastening bolts, the lateral position can be adjusted within the slide groove 2041 to ensure that the lens is aligned with the center of the printing area. The strip light source 203 is tightly fitted outside the camera lens by the buckle 2031 to ensure coaxial fixation with the lens and provide uniform and stable illumination for image acquisition. The linear guide rail 501 at the top of the frame 5 is precision ground and has a matching accuracy of 0.01mm with the slider 101 of the printing head assembly 1 to ensure smooth movement of the printing head. The adjustable feet 502 at the four corners of the bottom are screwed into the threaded holes 503 of the base plate by M12 bolts 5021 and, together with the rubber pads 5022, can quickly adjust the level of the equipment, making the printing machine run stably and reliably.

[0028] Working Principle: When the vision-based fully automatic screen printing machine is in operation, the substrate to be printed is precisely placed on the positioning platform 4 by the automatic feeding device. At this time, the array of suction holes 401 on the surface of the positioning platform 4 firmly fixes the substrate under negative pressure, and the bottom cross-shaped reinforcing ribs 402 ensure the stability of the platform and prevent substrate displacement. The vision module 2 starts working; the industrial camera 202 is adjusted to a suitable position via the slide groove 2041 on the L-shaped bracket 201 to acquire images of the positioning marks on the substrate. The bar light source 203 is coaxially fixed to the camera lens, providing uniform and stable illumination to ensure clear images. The acquired image information is transmitted to the control system, where image processing algorithms analyze and calculate the deviation between the actual position of the substrate and the preset printing position. The transmission system 3 responds immediately. The X / Y axis linear module 301 is fixed to the frame 5 at both ends via flanges 3011. The servo motor 3012 in the module receives commands from the control system and drives the drive wheel 3015 to rotate via coupling 3014. The synchronous belt 3013 then drives the slider 101 and the print head assembly 1, which are rigidly connected to the pressure plate 1011, to move precisely in the X and Y axis directions according to the deviation data, completing automatic alignment. Next, the print head assembly 1 operates. The doctor blade holder 102 adjusts its angle through the elongated slot 1021 and the wing nut 1022 to adapt to the screen and printing requirements. The screen holder 103's inner spring pressure plate 1031 firmly clamps the screen. Driven by the transmission system, the doctor blade applies pressure to the ink on the screen and moves, squeezing the ink from the mesh of the image area onto the substrate, completing high-quality printing.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A fully automatic screen printing machine based on vision positioning, comprising a printhead assembly (1), a vision module (2), a transmission system (3), a positioning platform (4), and a frame (5); characterized in that: The printing head assembly (1) is slidably connected to the guide rail via a slider (101); the vision module (2) is fixed to the side of the printing head assembly (1) via an L-shaped bracket (201); the transmission system (3) includes an X / Y axis linear module (301), and the two ends of the module are bolted to the frame (5) via flanges (3011); the positioning platform (4) has an array of adsorption holes (401) on its surface, and the bottom is welded to the frame (5) via cross reinforcing ribs (402).

2. The fully automatic screen printing machine based on vision positioning as described in claim 1, characterized in that: The linear module (301) of the transmission system (3) includes a servo motor (3012) and a synchronous belt (3013). The servo motor (3012) is directly connected to the drive wheel (3015) through a coupling (3014), and the synchronous belt (3013) is rigidly connected to the slider (101) through a pressure plate (1011).

3. The fully automatic screen printing machine based on vision positioning as described in claim 1, characterized in that: The printing head assembly (1) includes: a doctor blade holder (102) and a screen holder (103). The doctor blade holder (102) has elongated slots (1021) on both sides and is hinged to the screen holder (103) by a wing nut (1022). The screen holder (103) has a spring pressure plate (1031) on its inner side.

4. The fully automatic screen printing machine based on vision positioning as described in claim 1, characterized in that: The vision module (2) includes an industrial camera (202) and a bar light source (203). The industrial camera (202) is horizontally adjustable on an L-shaped bracket (201) via a slide (2041), and the bar light source (203) is coaxially fixed to the camera lens via a buckle (2031).

5. The fully automatic screen printing machine based on vision positioning as described in claim 1, characterized in that: The top of the frame (5) is provided with a linear guide rail (501), and the four corners of the bottom of the frame (5) are provided with adjustable feet (502). The feet (502) include M12 bolts (5021) and rubber pads (5022). The bolts (5021) are threaded into the threaded holes (503) of the bottom plate of the frame (5).

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