Circuit board screen printing device

Abstract

The utility model discloses a circuit board screen printing device which comprises a workbench, a transmission assembly and a screen printing mechanism, the transmission assembly is arranged on the workbench and comprises a conveying roller and a first driving part, a circuit board is wound on the conveying roller, and the first driving part drives the conveying roller to rotate so as to transmit the circuit board. The screen printing mechanism is arranged on the workbench in a sliding mode and comprises a screen frame and a scraper assembly, the screen frame can cover the multiple circuit boards on the workbench, and the scraper assembly is arranged above the screen frame in a sliding mode and used for pushing screen printing liquid to complete screen printing of the multiple circuit boards. The first driving piece can drive the conveying roller to continuously convey the circuit board base material towards the workbench, automatic feeding of the base material is achieved, and screen printing is conducted on the circuit board base material through the screen printing mechanism. And manual operation is not needed, positioning deviation caused by multiple times of feeding is avoided, the consistency and stability of pattern printing are guaranteed, and the production efficiency is improved.

Description

Technical Field

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

[0002] Flexible circuit board (PCB) screen printing is a key process for printing circuits, markings, and protective layers on flexible, thin substrates. PCB screen printing achieves ink transfer through the perforated pattern of a screen. The screen consists of a mesh, photosensitive emulsion, and a frame. After exposure and development, the areas to be printed are permeable, while the remaining areas are sealed by the photosensitive emulsion. During printing, a squeegee pushes the ink across the screen surface at a specific angle and pressure. Under pressure, the ink passes through the mesh and is precisely transferred to the flexible circuit board substrate below, thus forming the desired circuit, marking, or protective layer pattern.

[0003] In related technologies, screen printing still commonly employs a manual loading and board-by-board printing operation mode. Operators need to manually place each circuit board substrate on the worktable, remove it after the screen printing process is completed, and then replace it with the next substrate to continue printing. Screen printing is prone to quality problems such as positioning misalignment and pattern defects due to human error, severely restricting the improvement of production efficiency and yield. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a circuit board screen printing device, which has the advantages of high production efficiency and stability.

[0005] The circuit board screen printing device according to this utility model includes:

[0006] Workbench;

[0007] A transmission assembly, disposed on the worktable, includes a conveying roller and a first driving member. The conveying roller is wound with a circuit board, and the first driving member drives the conveying roller to rotate in order to transmit the circuit board.

[0008] A screen printing mechanism is slidably disposed on the worktable. The screen printing mechanism includes a stencil frame and a squeegee assembly. The stencil frame can cover multiple circuit boards on the worktable. The squeegee assembly is slidably disposed above the stencil frame and is used to push the screen printing liquid to complete the screen printing of multiple circuit boards.

[0009] The circuit board screen printing device according to this utility model has at least the following beneficial effects: a conveying roller is provided on one side of the worktable, and a circuit board substrate is wound on the conveying roller. The first driving component can drive the conveying roller to continuously convey the circuit board substrate towards the worktable, realizing automated feeding of the substrate, and screen printing the circuit board substrate through the screen printing mechanism. No manual operation is required, avoiding positioning deviations caused by multiple feedings, ensuring the consistency and stability of pattern printing, and improving production efficiency.

[0010] According to some embodiments of the present invention, the circuit board screen printing device further includes a lifting component and a second driving component. The lifting component is slidably disposed on the worktable, the screen frame is fixedly connected to the lifting component, the scraper assembly is slidably disposed on the lifting component, and the second driving component drives the lifting component to move up and down relative to the worktable.

[0011] According to some embodiments of the present invention, in the circuit board screen printing device, the lifting member is provided with a guide rail along the length direction of the worktable, the squeegee assembly is slidably connected to the guide rail, and the squeegee assembly is connected to a third driving member, the third driving member being used to drive the squeegee assembly to move along the guide rail.

[0012] According to some embodiments of the present invention, the PCB screen printing device includes a squeegee assembly comprising a support frame and a squeegee. The support frame is slidably disposed on the guide rail, and the squeegee is fixedly installed on the side of the support frame facing the worktable.

[0013] According to some embodiments of the present invention, the circuit board screen printing device has two squeegees and two telescopic members are movably connected to the support frame. The two telescopic members drive the two squeegees to extend and retract alternately.

[0014] According to some embodiments of the present invention, the squeegee of the circuit board screen printing device is inclined.

[0015] According to some embodiments of the present invention, the circuit board screen printing device has a feeding rack on the side of the worktable facing the conveying roller, the feeding rack is flush with the worktable, and the feeding rack has multiple guide rollers inside.

[0016] According to some embodiments of the present invention, in the circuit board screen printing device, the guide roller is provided with two limiting rings spaced apart along the axial direction, and the limiting rings are used to restrict the movement of the circuit board in the axial direction of the guide roller.

[0017] According to some embodiments of the present invention, the circuit board screen printing apparatus includes a collection mechanism disposed on the other side of the workbench, which is used to collect the circuit board.

[0018] According to some embodiments of the present invention, the circuit board screen printing device includes a collection mechanism comprising a roll roller and a fourth driving member, wherein the fourth driving member is used to drive the roll roller to rotate and wind the circuit board.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a schematic diagram of the circuit board screen printing device according to an embodiment of the present invention;

[0022] Figure 2 for Figure 1 An enlarged view of A is shown;

[0023] Figure 3 This is a front view of the circuit board screen printing device according to an embodiment of the present invention;

[0024] Figure 4 for Figure 3 An enlarged view of B is shown.

[0025] Explanation of icon numbers:

[0026] Workbench 100; Loading rack 110; Guide roller 120; Limiting ring 130;

[0027] 200; conveying roller 210; collecting mechanism 220; winding roller 221;

[0028] Screen printing mechanism 300; screen frame 310; squeegee assembly 320; support frame 321; squeegee 322; lifting component 323; lifting component 330; guide rail 331. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Screen printing on flexible printed circuit boards (PCBs) achieves ink transfer through the perforated patterns on a screen. The screen consists of a mesh, photosensitive emulsion, and a frame. After exposure and development, the areas to be printed are permeable, while the remaining areas are sealed by the photosensitive emulsion. During printing, a squeegee pushes the ink across the screen surface at a specific angle and pressure. Under pressure, the ink passes through the mesh and is precisely transferred to the flexible PCB substrate below, forming the desired circuitry, markings, or protective layer patterns. Currently, screen printing commonly employs a manual loading and board-by-board printing process. Operators must manually place each PCB substrate on the worktable, remove it after the screen printing process is completed, and then replace it with the next substrate to continue printing. Manual operation errors during screen printing can easily lead to positioning misalignment, pattern defects, and other quality problems, severely restricting production efficiency and yield.

[0035] Therefore, such as Figures 1 to 4The diagram shows the circuit board screen printing device proposed in this utility model, including a worktable 100, a transmission component 200, and a screen printing mechanism 300. The transmission component 200 is disposed on the worktable 100 and includes a conveying roller 210 and a first driving member. The conveying roller 210 is wound with circuit boards, and the first driving member drives the conveying roller 210 to rotate to transport the circuit boards. Multiple sets of transparent supplementary lighting windows are embedded on both sides of the worktable 100, and a CCD camera is installed inside the worktable 100, positioned opposite the supplementary lighting windows. The screen printing mechanism 300 is slidably disposed on the worktable 100 and includes a stencil frame 310 and a squeegee assembly 320. The stencil frame has a rectangular structure and its width is greater than the width of the circuit boards. The stencil frame 310 can cover multiple circuit boards on the worktable 100. The squeegee assembly 320 is slidably disposed above the stencil frame 310 and is used to push the screen printing liquid to complete the screen printing of multiple circuit boards. The first driving component can drive the conveying roller 210 to continuously convey the circuit board substrate to the worktable 100, and screen print the circuit board substrate through the screen printing mechanism 300. No manual operation is required, which avoids the positioning deviation caused by multiple feedings, ensures the consistency and stability of pattern printing, and improves production efficiency.

[0036] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the transmission assembly 200 includes a collection mechanism 220, which is located on the other side of the worktable 100. The collection mechanism 220 is used to collect circuit boards. In some applications, one end of the circuit board substrate is connected to the collection device. The conveying roller 210 starts to rotate under the drive of the first driving component, leading out the circuit board substrate. The collection mechanism 220 cooperates to pull the circuit board, which is then laid flat on the worktable 100 and smoothly transitioned to the bottom of the screen frame. Positioning marks are provided on both sides of the circuit board. The transparent supplementary lighting windows on both sides of the worktable 100 provide sufficient light. In conjunction with the CCD camera located in a relatively position inside, and the positioning marks on the side of the circuit board, the position of the circuit board is accurately determined, ensuring accurate printing position.

[0037] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the collecting mechanism 220 includes a winding roller 221 and a fourth driving component. The winding roller 221 has the same diameter as the feeding roller and rotates at the same speed. The fourth driving component drives the winding roller 221 to rotate and wind the circuit board. When the circuit board is printed, the fourth driving component operates and drives the winding roller 221 to rotate, gradually winding and collecting the printed circuit board. The conveyor roller 210 works in conjunction with the winding roller 221 to ensure stable and efficient feeding and collecting, achieving continuity in the printing process. It should be noted that both the first and fourth driving components are motors.

[0038] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the screen printing mechanism 300 also includes a lifting component 330 and a second driving component, the second driving component being a motor. The lifting component 330 has a rectangular structure and is parallel to the length direction of the worktable 100, and is slidably mounted on the worktable 100. The worktable 100 includes a longitudinally arranged connecting plate, and the connecting plate is provided with a longitudinally extending guide rail 331. The lifting component 330 is mounted on the connecting plate and moves up and down along the guide rail 331. The screen frame 310 is fixedly connected to the lifting component 330, and the squeegee assembly 320 is slidably mounted on the lifting component 330. The second driving component drives the lifting component 330 to move up and down relative to the worktable 100.

[0039] In some embodiments of this utility model, such as Figure 1 and Figure 3 As shown, the lifting component 330 is provided with a guide rail 331 along the length of the worktable 100. The length of the guide rail 331 is the same as the length of the lifting component 330. Limiting blocks are provided on both sides of the guide rail 331 to prevent the scraper assembly 320 from exceeding its stroke range during operation. The scraper assembly 320 is slidably connected to the guide rail 331. The scraper assembly 320 is connected to a third driving component, which is a servo motor. The third driving component is used to drive the scraper assembly 320 to move along the guide rail 331.

[0040] In some embodiments of this utility model, such as Figure 4 As shown, the scraper assembly 320 includes a support frame 321 and a scraper 322. The support frame 321 is integrally formed from an aluminum alloy profile. A rectangular mounting groove is provided on the side of the support frame 321 facing the worktable 100, and an elastic buffer pad is installed in the groove to absorb the vibration generated by the scraper 322 during operation. The support frame 321 is slidably mounted on the guide rail 331, and the scraper 322 is fixedly mounted on the side of the support frame 321 facing the worktable 100.

[0041] In some embodiments of this utility model, such as Figure 4As shown, there are two squeegees 322, and two telescopic components are movably connected to the support frame 321. The telescopic components are U-shaped and pneumatically driven, and each of the two telescopic components drives the two squeegees 322 to extend and retract alternately. When one telescopic component extends, it pushes the corresponding squeegee 322 down to fit against the screen frame, while the other squeegee 322 is raised to a standby position by the retraction of the telescopic component. At this time, the third drive component drives the entire squeegee assembly 320 to move at a constant speed along the guide rail 331, so that the squeegee 322 pushes the ink, and the ink is transferred through the screen's stencil pattern to the surface of the flexible circuit board substrate, completing a single printing stroke. When the squeegee assembly 320 moves to the end of the guide rail 331, the telescopic component corresponding to the working squeegee 322 quickly retracts and lifts away from the screen. At the same time, the other squeegee 322 in the standby state is driven by the extension of its corresponding telescopic component to descend to fit against the screen frame 310. The third drive unit then reverses the drive of the doctor blade assembly 320 back along the guide rail 331, and another doctor blade 322 continues to push the ink to complete the reverse printing, realizing uninterrupted printing cycle. The alternating operation of the two doctor blades 322 and the linear reciprocating motion achieve efficient printing.

[0042] In some embodiments of this utility model, such as Figure 4 As shown, the scraper 322 is set at an angle, and the angle between the scraper 322 and the horizontal plane of the worktable 100 is 45 degrees to 60 degrees. The angle of inclination can adjust the flow direction of the ink so that the ink can be spread evenly.

[0043] In some embodiments of this utility model, such as Figure 2 As shown, a loading rack 110 is provided on the side of the worktable 100 facing the conveyor roller 210. The loading rack 110 is flush with the worktable 100, and multiple guide rollers 120 are provided inside the loading rack 110. The circuit board is conveyed to the surface of the loading rack 110 by the conveyor roller 210, and then smoothly transitions to the printing area of ​​the worktable 100, which can prevent wrinkles or tensile deformation caused by local stress concentration.

[0044] In some embodiments of this utility model, such as Figure 2 As shown, the guide roller 120 is provided with two limiting rings 130 spaced apart along the axial direction. The limiting rings 130 are fixed to the guide roller 120 by fasteners and are used to restrict the movement of the circuit board in the axial direction of the guide roller 120. For different products with different widths, the operator can adjust the fixed position of the limiting rings 130 according to the actual situation, so that the circuit board screen printing device can adapt to the feeding needs of various specifications of products, thereby improving the versatility and adaptability of the equipment.

[0045] In some embodiments of this utility model (not shown in the figures), the circuit board screen printing device also includes an ink supply system. Specifically, before product printing, a suitable screen printing plate is selected and installed on the screen frame 310 according to the printing pattern and product size. The screen printing plate is then firmly fixed in a suitable position on the screen frame 310 to ensure that it does not shift during printing. Then, the ink supply system starts working, delivering ink to the surface of the screen printing plate at a certain flow rate and pressure. Subsequently, the squeegee 322 moves on the surface of the screen printing plate at a specific speed and angle under the drive of the third driving component. The squeegee 322 squeezes the ink through the mesh of the screen printing plate onto the surface of the circuit board to form a printed pattern. Both the screen printing plate and the ink supply system are commercially available technologies.

[0046] In some embodiments of this utility model (not shown in the figures), the circuit board screen printing device includes a control box, and a PLC controller is installed inside the control box. Specifically, when the circuit board is conveyed to the bottom of the screen frame 310, the CCD camera captures the position information of the circuit board and transmits it to the PLC controller. The PLC controller determines whether the product position is accurate according to the preset printing pattern and position parameters. If the position is deviated, it quickly issues a command to adjust the speed of the conveyor roller 210 and the roll roller 221. At the same time, the PLC control can also issue an alarm to prompt the operator to handle the situation in a timely manner.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A circuit board screen printing device, characterized in that, include: Workbench (100); A transmission assembly (200) is disposed on the worktable (100) and includes a conveying roller (210) and a first driving member. The conveying roller (210) is wound with a circuit board, and the first driving member drives the conveying roller (210) to rotate to transmit the circuit board. A screen printing mechanism (300) is slidably disposed on the worktable (100). The screen printing mechanism (300) includes a stencil frame (310) and a squeegee assembly (320). The stencil frame (310) can cover multiple circuit boards on the worktable (100). The squeegee assembly (320) is slidably disposed above the stencil frame (310). The squeegee assembly (320) is used to push the screen printing liquid to complete the screen printing of multiple circuit boards.

2. The circuit board screen printing device according to claim 1, characterized in that: The screen printing mechanism (300) further includes a lifting component (330) and a second driving component. The lifting component (330) is slidably disposed on the worktable (100). The screen frame (310) is fixedly connected to the lifting component (330). The scraper assembly (320) is slidably disposed on the lifting component (330). The second driving component drives the lifting component (330) to move up and down relative to the worktable (100).

3. The circuit board screen printing device according to claim 2, characterized in that: The lifting component (330) is provided with a guide rail (331) along the length direction of the worktable (100). The scraper assembly (320) is slidably connected to the guide rail (331). The scraper assembly (320) is connected to a third driving component, which is used to drive the scraper assembly (320) to move along the guide rail (331).

4. The circuit board screen printing device according to claim 3, characterized in that: The scraper assembly (320) includes a support frame (321) and a scraper (322). The support frame (321) is slidably disposed on the guide rail (331), and the scraper (322) is fixedly installed on the side of the support frame (321) facing the worktable (100).

5. The circuit board screen printing device according to claim 4, characterized in that: There are two scrapers (322), and the support frame (321) is movably connected to two telescopic members. The two telescopic members drive the two scrapers (322) to extend and retract alternately.

6. The circuit board screen printing device according to claim 4 or 5, characterized in that: The scraper (322) is set at an angle.

7. The circuit board screen printing device according to claim 1, characterized in that: The workbench (100) is provided with a feeding rack (110) on the side facing the conveying roller (210). The feeding rack (110) is flush with the workbench (100), and multiple guide rollers (120) are provided inside the feeding rack (110).

8. The circuit board screen printing device according to claim 7, characterized in that: The guide roller (120) is provided with two limiting rings (130) spaced apart along the axial direction. The limiting rings (130) are used to restrict the circuit board from moving along the axial direction of the guide roller (120).

9. The circuit board screen printing device according to claim 1, characterized in that: The transmission component (200) includes a collection mechanism (220) disposed on the other side of the workbench (100), the collection mechanism (220) being used to collect the circuit board.

10. The circuit board screen printing device according to claim 9, characterized in that: The collecting mechanism (220) includes a winding roller (221) and a fourth driving member, the fourth driving member being used to drive the winding roller (221) to rotate and wind the circuit board.

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