A control method for a PCB board inkjet printer and a PCB board inkjet printing production line

Abstract

The present invention proposes a PCB board inkjet printer and a PCB board inkjet production line, including an inkjet system, a horizontal conveyor belt for conveying PCB boards, and a liftable workbench; when the PCB board is fed, the liftable workbench is located below the horizontal conveyor belt; when the PCB board follows the horizontal conveyor belt to move above the liftable workbench, the liftable workbench lifts the PCB board to be lifted off the horizontal conveyor belt, and fixes the PCB board on the liftable workbench; the inkjet system prints the PCB board; after the printing is completed, the liftable workbench descends, and the PCB board falls to the horizontal conveyor belt and continues to be conveyed following the horizontal conveyor belt. The present invention realizes the automated assembly line production of PCB board printing by transmitting the PCB board on the horizontal conveyor belt and printing on the liftable workbench, with high production efficiency; high positioning accuracy, avoiding the positioning error caused by the use of a manipulator and a truss structure in the prior art; four CCD cameras are used to compensate for graphic deformation, size and shape errors, further improving the accuracy of positioning printing.

Description

Technical Field

[0001] The invention relates to the technical field of inkjet printed circuits, and in particular to a control method for a PCB board inkjet printer and a PCB board inkjet printing production line. Background Art

[0002] PCB (Printed Circuit Board), whose Chinese name is printed circuit board, also known as printed circuit board, is an important electronic component, a support for electronic components, and a carrier for electrical connections of electronic components.

[0003] Printed circuit boards have evolved from single-layer to double-sided, multi-layer and flexible, and they still maintain their respective development trends. As they continue to develop towards high precision, high density and high reliability, they continue to reduce size, reduce costs and improve performance, making printed circuit boards still maintain strong vitality in the development of future electronic equipment.

[0004] In summary, the discussions at home and abroad on the future development trend of printed circuit board production and manufacturing technology are basically consistent, that is, it will develop towards high density, high precision, fine aperture, fine wire, fine pitch, high reliability, multi-layer, high-speed transmission, light weight and thinness. At the same time, in production, it will develop towards improving productivity, reducing costs, reducing pollution, and adapting to multi-variety and small-batch production.

[0005] At present, the research on inkjet printers at home and abroad mainly focuses on inkjet detection systems, ink curing systems and motion control systems, but lacks optimization of the working process. Therefore, the following technical problems exist:

[0006] The degree of automation is not high and operator intervention is required. The current PCB printing equipment requires the operator to assist through mechanisms such as robots and truss structures during the loading and unloading and flipping processes, which affects production efficiency and production costs.

[0007] In addition, the maximum printable format is small, which affects the production work range; it does not take into account the positioning accuracy due to the deformation, expansion and contraction of the board and the initial error of the board itself, so the printing accuracy for large-format PCB boards is poor. Summary of the invention

[0008] In order to solve the above problems, the present invention proposes a control method for a PCB board inkjet printer and a PCB board inkjet printing production line, which realizes the automated assembly line production of PCB board inkjet printing with high production efficiency; the positioning accuracy of the PCB board is high, the inkjet printing accuracy is improved, and it is suitable for the inkjet printing of large-format PCB boards.

[0009] Technical solution: The present invention proposes a control method for a PCB board inkjet printer, comprising an inkjet system, a horizontal conveyor belt for conveying PCB boards, and a liftable worktable; when the PCB board is fed, the liftable worktable is located below the horizontal conveyor belt; when the PCB board follows the horizontal conveyor belt to move above the liftable worktable, the liftable worktable lifts the PCB board to lift it off the horizontal conveyor belt, and fixes the PCB board on the liftable worktable; the inkjet system prints the PCB board; after the printing is completed, the liftable worktable descends, and the PCB board falls onto the horizontal conveyor belt and continues to be conveyed following the horizontal conveyor belt.

[0010] Furthermore, there are two horizontal conveyor belts, which are arranged in parallel; and the liftable workbench is located in the area between the two horizontal conveyor belts.

[0011] Furthermore, it also includes a lifting motor and a plurality of lifting modules symmetrically distributed and connected below the liftable workbench; the lifting motor drives the plurality of lifting modules and the liftable workbench to lift and lower through a synchronous belt transmission.

[0012] Furthermore, a plurality of pneumatic balancers are arranged below the liftable workbench.

[0013] Furthermore, the liftable workbench is provided with vacuum adsorption holes.

[0014] Furthermore, a first limit pin for limiting the advancement of the PCB board is provided on the PCB board removal side of the liftable workbench; and a pressing plate mechanism for pressing and fixing the PCB board on the liftable workbench is provided on both sides of the horizontal conveyor belt.

[0015] Furthermore, it also includes a feeding and conveying unit located at the PCB board feeding end of the liftable workbench; the feeding unit includes in-place sensors and a second limit pin for limiting the advancement of the PCB board, which are sequentially arranged along the feeding direction of the feeding and conveying unit; and clappers for centering the PCB board are also symmetrically arranged on both sides of the feeding and conveying unit.

[0016] Furthermore, the inkjet system comprises a first gantry straddling two sides of the liftable workbench and an inkjet head movably mounted on a crossbeam of the first gantry; the first gantry can reciprocate along the conveying direction of the horizontal conveyor belt.

[0017] Furthermore, it also includes a second gantry located at the PCB board moving-in side of the liftable workbench; two CCD cameras are respectively arranged on the opposite sides of the second gantry and the first gantry.

[0018] The present invention also proposes a PCB board printing production line, comprising two of the above-mentioned PCB board printing machines; the discharge end of one PCB board printing machine is connected to the feed end of the other PCB board printing machine through a plate turning machine.

[0019] Beneficial effects: The present invention realizes the automated assembly line production of PCB board printing through the horizontal conveyor belt and the liftable workbench, does not require a manipulator and a truss structure, and has high production efficiency; in addition, the PCB board is transmitted on the horizontal conveyor belt and is sprayed on the liftable workbench, and high-precision positioning is achieved through the clapper board, the second limit pin, the vacuum adsorption hole, the pressure plate mechanism and the first limit pin, thereby avoiding the positioning error caused by the use of the manipulator and the truss structure in the prior art, improving the printing accuracy, and being suitable for the printing of large-format PCB boards; the present invention adopts four CCD cameras to directly align the marks on the PCB board, and the four CCD cameras perform graphic correction to compensate for graphic deformation, size and shape errors, thereby greatly improving the efficiency, eliminating the error in the positioning movement, and further improving the accuracy of positioning printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a schematic diagram of the internal structure of the liftable workbench of the present invention;

[0022] Figure 3 It is a schematic diagram of the external structure of the liftable workbench of the present invention;

[0023] Figure 4 It is a schematic structural diagram of a feed conveying unit of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of the discharge roller of the present invention. DETAILED DESCRIPTION

[0025] like Figure 1 The present invention provides a control method for a PCB board inkjet printer, which includes an inkjet system, a horizontal conveyor belt 1 for conveying PCB boards, and a liftable workbench 2.

[0026] like Figure 4 The present invention also includes a feeding and conveying unit 5 located at the PCB board feeding end of the liftable workbench 2; the feeding unit includes an in-place sensor 6 and a second limit pin 7 that limits the advancement of the PCB board, which are sequentially arranged along the feeding direction of the feeding and conveying unit 5; and clappers 8 for centering the PCB board are symmetrically arranged on both sides of the feeding and conveying unit 5.

[0027] like Figure 2 and Figure 3 There are two horizontal conveyor belts 1, which are arranged in parallel; the liftable workbench 2 is lifted and lowered in the area between the two horizontal conveyor belts 1. The two horizontal conveyor belts 1 are driven by a conveying motor 14 and a transmission belt 15 to ensure that the conveying speed on both sides is consistent.

[0028] The present invention further comprises a lifting motor and a plurality of lifting modules symmetrically distributed and connected below the liftable workbench 2; the lifting motor drives the plurality of lifting modules and the liftable workbench 2 to lift and lower via a synchronous belt transmission.

[0029] This embodiment adopts a single lifting motor drive, which drives four lifting modules through a synchronous belt to realize the lifting of the liftable workbench 2. The single lifting motor drive ensures that if the lifting motor fails, all lifting modules will stop at the same time without causing damage to the lifting modules.

[0030] A plurality of pneumatic balancers are also arranged below the liftable workbench 2 .

[0031] At the same time, since the liftable work platform 2 is relatively heavy, pneumatic balancers are arranged at four positions of the liftable work platform 2. The air pressure is adjusted so that the lifting force of the pneumatic balancer balances the dead weight of the liftable work platform 2, so that the lifting motor can drive the liftable work platform 2 with a smaller driving force.

[0032] The liftable workbench 2 is provided with vacuum adsorption holes.

[0033] A first limit pin 3 for limiting the advancement of the PCB board is arranged on the PCB board removal side of the liftable workbench 2 ; and a pressing plate mechanism 4 for pressing and fixing the PCB board on the liftable workbench 2 is arranged on both sides of the horizontal conveyor belt 1 .

[0034] The inkjet system includes a first gantry 9 straddling two sides of the liftable workbench 2 and an inkjet head 10 movably mounted on a crossbeam of the first gantry 9 ; the first gantry 9 can reciprocate along the conveying direction of the horizontal conveyor belt 1 .

[0035] The present invention further comprises a second gantry 11 located at the PCB board moving-in side of the liftable workbench 2; two CCD cameras 12 are respectively arranged on the opposite sides of the second gantry 11 and the first gantry 9.

[0036] Compared with the traditional use of a single CCD camera and a dual CCD camera, the present invention uses four CCD cameras for positioning, which has obvious advantages in efficiency. A single CCD camera or a dual CCD camera generally calibrates the marking points on the PCB board through a compound movement in the X direction and the Y direction, and then corresponds to the marking points of the design file, and the designed graphics are overprinted on the PCB board with the graphics to be printed through a deformation algorithm to effectively reduce the deformation or deviation of the printed graphics caused by the expansion and contraction of the board. The present invention uses four CCD cameras to directly align the marks on the PCB board, and the four CCD cameras perform graphic correction, which is used to compensate for graphic deformation, size and shape errors. The efficiency is greatly improved, and the errors in positioning movement can be eliminated. Compared with the prior art using a single CCD camera or a dual CCD camera, the accuracy of positioning printing is further improved.

[0037] When the present invention is used, the PCB board is fed from the feeding and conveying unit 5 and moves forward. After reaching the in-position sensor 6, the second limit pin 7 extends to prevent the PCB board from moving forward; the clapper 8 moves synchronously from both sides of the PCB board toward the center to ensure that the PCB board is located in the middle position of the feeding and conveying unit 5; after completing the first positioning of the PCB board, the second limit pin 7 retracts and the PCB board continues to move forward.

[0038] When the PCB board is located at the feeding and conveying unit 5, the liftable workbench 2 is located below the horizontal conveyor belt 1; when the PCB board follows the horizontal conveyor belt 1 to move above the liftable workbench 2, the PCB board is stopped by the first limit pin 3; the liftable workbench 2 lifts the PCB board from the area between the two horizontal conveyor belts 1 to detach from the horizontal conveyor belt 1, and fixes the PCB board on the liftable workbench 2 through the vacuum adsorption holes and the pressing plate mechanism 4; the inkjet system prints the PCB board; after the printing is completed, the vacuum adsorption is released, the liftable workbench 2 descends, and the PCB board falls to the horizontal conveyor belt 1 and continues to be conveyed following the horizontal conveyor belt 1.

[0039] The present invention also proposes a PCB printing production line, comprising two PCB printing machines as described above; the discharge end of one PCB printing machine is connected to the feed end of another PCB printing machine through a plate turning machine. Figure 5 The discharge roller 13 is shown.

Claims

1. A control method for a PCB board inkjet printer, characterized in that: The invention comprises an inkjet system, a horizontal conveyor belt (1) for conveying PCB boards, and a liftable worktable (2); when the PCB boards are fed, the liftable worktable (2) is located below the horizontal conveyor belt (1); when the PCB boards follow the horizontal conveyor belt (1) to move above the liftable worktable (2), the liftable worktable (2) lifts the PCB boards to be detached from the horizontal conveyor belt (1), and fixes the PCB boards on the liftable worktable (2); the inkjet system prints on the PCB boards; after the printing is completed, the liftable worktable (2) descends, and the PCB boards are lowered onto the horizontal conveyor belt (1) and continue to be conveyed following the horizontal conveyor belt (1); the horizontal conveyor belts (1) are two and are arranged in parallel; the liftable worktable (2) is located in the area between the two horizontal conveyor belts (1); and the invention also comprises a lifting motor and a plurality of lifting modules symmetrically distributed and connected below the liftable worktable (2); the lifting motor drives the plurality of lifting modules and the liftable worktable (2) through a synchronous belt drive. 2) lifting; a plurality of pneumatic balancers are also arranged below the liftable workbench (2), and the air pressure is adjusted so that the lifting force of the pneumatic balancers balances the deadweight of the liftable workbench; a vacuum adsorption hole is arranged on the liftable workbench (2); a first limit pin (3) is arranged on the PCB board removal side of the liftable workbench (2) to limit the forward movement of the PCB board; a pressing plate mechanism (4) is arranged on both sides of the horizontal conveyor belt (1) for pressing and fixing the PCB board on the liftable workbench (2); the inkjet system comprises a first gantry (9) straddling both sides of the liftable workbench (2) and an inkjet head (10) movably mounted on the crossbeam of the first gantry (9); the first gantry (9) can reciprocate along the conveying direction of the horizontal conveyor belt (1); and also comprises a second gantry (11) located on the PCB board removal side of the liftable workbench (2); two CCD cameras (12) are respectively arranged on the opposite sides of the second gantry (11) and the first gantry (9).

2. The control method of the PCB board inkjet printer according to claim 1, characterized in that: It also comprises a feeding and conveying unit (5) located at the PCB board feeding end of the liftable workbench (2); the feeding and conveying unit comprises in-position sensors (6) and second limit pins (7) for limiting the forward movement of the PCB board, which are sequentially arranged along the feeding direction of the feeding and conveying unit (5); and clappers (8) for centering the PCB board are symmetrically arranged on both sides of the feeding and conveying unit (5).

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