Circuit board character front and back alignment printing device

Abstract

The invention relates to the technical field of circuit board printing, in particular to a circuit board character front and back alignment printing device. According to the circuit board character front and back alignment printing device, the front and back faces of the circuit board can be printed at the same time, the circuit board can be automatically conveyed and collected, manpower is saved, and the printing efficiency of the circuit board is improved. A circuit board character front and back alignment printing device comprises a bottom frame, mounting frames and the like, and the mounting frames are connected to the front portion and the rear portion of the bottom frame. After a circuit board is conveyed between printing plates, a double-shaft motor is started, a first lead screw is driven to rotate, first sliding parts move along guide rods to be close to each other, sleeves are driven to be close to each other, the printing plates are clamped by clamping parts through the acting force of first springs, and then the printing plates are close to each other to conduct alignment printing on the front face and the back face of the circuit board; and the effects that the circuit board can be conveyed, and the front face and the back face of the circuit board can be printed at the same time are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board printing, and in particular to a device for printing characters on both sides of a circuit board. Background Art

[0002] Printing characters on both sides of a circuit board refers to the process of accurately printing characters, marks or graphics on the front and back of a circuit board (PCB). This printing not only helps with the identification and tracking of the circuit board, but also improves the readability and maintainability of the circuit board.

[0003] The existing circuit board character printing device clamps the circuit board on the clamping frame, and then the clamping frame moves the circuit board to the printing plate for printing, and then the printing plate is flipped by flipping the clamping frame to print on both sides of the circuit board. Since the circuit board needs to be manually clamped on the clamping frame, it needs to be manually removed and collected after printing, which consumes manpower. In addition, the two sides of the circuit board need to be printed separately, which affects the printing efficiency of the circuit board.

[0004] Therefore, a circuit board character front and back alignment printing device has been developed that can print on the front and back sides of the circuit board at the same time, and can automatically transport and collect the circuit board, saving manpower and improving circuit board printing efficiency. Summary of the invention

[0005] In order to overcome the shortcomings of the existing circuit board character printing device, the circuit board needs to be manually clamped on the clamping frame, and after printing, it needs to be manually removed and collected, which consumes manpower, and the two sides of the circuit board need to be printed separately, which affects the printing efficiency of the circuit board. The present invention provides a circuit board character front and back alignment printing device that can print on the front and back sides of the circuit board at the same time, and can automatically transport and collect the circuit board, saving manpower and improving the printing efficiency of the circuit board.

[0006] The technical solution is as follows: A device for printing characters on both sides of a circuit board, comprising a base frame, a mounting frame, guide strips, a printing mechanism and a placement mechanism. The front and rear parts of the base frame are connected to the mounting frames, and the guide strips are connected to the sides of the mounting frames that are close to each other. A printing mechanism capable of printing on the front and back sides of the circuit board is provided between the mounting frames, and a placement mechanism capable of conveying the circuit board is also provided between the mounting frames.

[0007] Optionally, the printing mechanism includes a dual-axis motor, a first screw rod, a guide rod, a first sliding member, a sleeve, a clamp, a first spring and a printing plate. The dual-axis motor is connected to the side of the middle part of the installation frame that is away from each other, the first screw rod is connected to the output shaft of the dual-axis motor, the guide rod is connected to the middle part of the installation frame, the upper and lower parts of the guide rod are slidably connected to the first sliding member, the first sliding member is threadedly connected to the adjacent first screw rod, the first sliding member is connected to the sleeve in a sleeve manner, the sleeve is slidably connected to the clamp, the first spring is connected between the clamp and the connected sleeve, and the printing plate is clamped between two laterally adjacent clamps. The dual-axis motor is started to drive the first screw rod to rotate, so that the first sliding member moves closer to each other along the guide rod, and the sleeve is driven closer to each other. Through the action of the first spring, the clamp clamps the printing plate, and then the printing plates are closer to each other for alignment printing on the front and back sides of the circuit board.

[0008] Optionally, the placement mechanism includes a second screw rod, a bidirectional motor, a transmission assembly, a second sliding member, a telescopic plate, a placement plate and a second spring, the second screw rod is rotatably connected inside the installation frame, the bidirectional motor is connected to the left side of the installation frame on the front side, the output shaft of the right side of the bidirectional motor is connected to the second screw rod on the front side, and a transmission assembly is provided between the output shaft of the left side of the bidirectional motor and the second screw rod on the rear side, the right part of the second screw rod is threadedly connected to the second sliding member, the second sliding members are slidably connected to adjacent guide strips, the telescopic plates are slidably connected on the sides where the second sliding members are close to each other, the placement plates are connected on the sides where the telescopic plates are close to each other, and the second spring is connected between the telescopic plates and the connected second sliding members, the circuit board is placed between the placement plates, and the placement plate is clamped by the force of the second spring, and then the bidirectional motor is started to drive the second screw rod on the front side to rotate. When the bidirectional motor is started, the second screw rod on the rear side is driven to rotate through the transmission assembly, so that the second sliding member moves along the guide strip, driving the telescopic plate and the placement plate to move.

[0009] Optionally, the transmission assembly includes a transmission wheel and a belt. The output shaft on the left side of the bidirectional motor is connected to the transmission wheel, the left part of the second screw rod on the rear side is also connected to the transmission wheel, and a belt is wound around the transmission wheels.

[0010] Optionally, it also includes a clamping mechanism, which includes a guide frame, a third sliding member, a fixed rod, a third spring and a pressure frame, the guide frame is connected to the side of the lower part of the installation frame that is close to each other, the fixed rod is connected to the lower sides of the left and right parts of the second sliding member, the pressure frame is slidably connected between two adjacent fixed rods, the third sliding member is connected to the pressure frame, the third sliding member is slidably matched with adjacent guide frames, and the pressure frame is connected to a third spring between the connected fixed rods. When the second sliding member moves, it drives the pressure frame to move, so that the third sliding member moves on the guide frame, and when the third sliding member moves to the lower part of the guide frame, it drives the pressure frame to move downward on the fixed rod, so that the pressure frame cooperates with the placement plate to clamp the circuit board.

[0011] Optionally, it also includes a unloading mechanism, which includes a rotating frame, a spiral spring, a guide frame, a sliding frame, a multi-section cylinder and a support plate. The left part of the base frame is rotatably connected to two front and rear rotating frames, and the rotating frames are connected to the base frame with a spiral spring. The front and rear sides of the left part of the base frame are connected to two upper and lower guide frames, and the guide frames are slidably connected with the sliding frames. The rotating frames are movably connected to the sliding frames. The lower left part of the base frame is connected to a multi-section cylinder, and the telescopic end of the multi-section cylinder is connected to a support plate. The support plate is extruded and matched with the rotating frame, and the support plate is moved downward by the multi-section cylinder, so that the support plate squeezes the rotating frame to rotate, and the spiral spring is deformed. When the rotating frame rotates, it pushes the sliding frame to move on the guide frame, so that the sliding frame pushes the circuit board away from the support plate.

[0012] Optionally, anti-slip grooves are provided on the support plate.

[0013] Optionally, a collecting mechanism is also included, which includes a collecting box, a fixing and a pull rod. The collecting box is located on the left side of the base frame and is placed on the ground. The front and rear sides of the collecting box are connected with fixings, and the fixings are rotatably connected with pull rods. The pull rods are snap-fitted with the base frame. After the sliding frame pushes the circuit board away from the pallet, the circuit board enters the collecting box. After the collecting box is full, the pull rod is rotated to separate the pull rod from the base frame, and then the collecting box is moved to the circuit board storage area.

[0014] Optionally, two left and right moving wheels are provided on the lower sides of the front and rear parts of the collection box.

[0015] Optionally, a loading mechanism is also included, which includes a support frame, a conveyor belt and a servo motor. The support frame is connected to the lower right part of the base frame, and two left and right transmission rollers are rotatably provided on the upper part of the support frame. A conveyor belt is wound around the transmission rollers. A servo motor is connected to the front right side of the support frame, and the output shaft of the servo motor is connected to the transmission roller on the right side. When the servo motor is started, the transmission roller is driven to rotate, so that the conveyor belt rotates to transmit the circuit board to between the placement plates for clamping.

[0016] The beneficial effects of the present invention are as follows: 1. After the circuit board is transported between the printing plates, the present invention starts the dual-axis motor to drive the first screw to rotate, so that the first sliding member moves along the guide rod to approach each other, drives the sleeve to approach each other, and through the action force of the first spring, the clamp clamps the printing plate, and then the printing plates approach each other to perform alignment printing on the front and back sides of the circuit board, thereby achieving the effect of being able to transport the circuit board and print on the front and back sides of the circuit board at the same time.

[0017] 2. The present invention drives the pressure frame to move while the second sliding member moves, so that the third sliding member moves on the guide frame. When the third sliding member moves to the lower part of the guide frame, it drives the pressure frame to move downward on the fixed rod. The third spring is stretched, so that the pressure frame cooperates with the placement plate to clamp the circuit board, thereby achieving the effect of pressing the circuit board and preventing the circuit board from moving.

[0018] 3. The present invention uses a multi-section cylinder to move the support plate downward, so that the support plate squeezes the rotating frame to rotate, and the scroll spring is deformed. When the rotating frame rotates, it pushes the sliding frame to move on the guide frame, so that the sliding frame pushes the circuit board away from the support plate, thereby achieving the effect of automatically unloading the circuit board from the placement plate and saving manpower.

[0019] 4. After the present invention pushes the circuit board away from the pallet through the sliding frame, the circuit board enters the collection box. After the collection box is full, the pull rod is rotated to separate the pull rod from the bottom frame, and then the collection box is moved to the circuit board storage area to store the circuit board, thereby achieving the effect of being able to collect the circuit boards and facilitating the transportation of the circuit boards, thereby improving the efficiency of circuit board printing.

[0020] 5. The present invention moves the produced circuit boards to the conveyor belt, and then starts the servo motor to drive the transmission roller to rotate, so that the conveyor belt rotates to transfer the circuit boards to the placement plates for clamping, thereby achieving the effect of automatically loading the circuit boards, saving manpower, and improving the efficiency of circuit board printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0022] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the printing mechanism of the present invention.

[0024] Figure 4 It is a three-dimensional structural schematic diagram of the placement mechanism of the present invention.

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention.

[0026] Figure 6 It is a three-dimensional structural schematic diagram of the unloading mechanism of the present invention.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the collecting mechanism of the present invention.

[0028] Figure 8 It is a three-dimensional structural schematic diagram of the feeding mechanism of the present invention.

[0029] Markings in the accompanying drawings: 1: chassis, 2: mounting frame, 3: guide bar, 4: printing mechanism, 41: double-axis motor, 42: first screw rod, 43: guide rod, 44: first sliding member, 45: sleeve, 46: clamp, 47: first spring, 48: printing plate, 5: placement mechanism, 51: second screw rod, 52: bidirectional motor, 53: transmission assembly, 54: second sliding member, 55: telescopic plate, 56: placement plate, 57: second spring , 6: clamping mechanism, 61: guide frame, 62: third sliding member, 63: fixing rod, 64: third spring, 65: pressing frame, 7: unloading mechanism, 71: rotating frame, 72: scroll spring, 73: guide frame, 74: sliding frame, 75: multi-section cylinder, 76: support plate, 8: collecting mechanism, 81: collecting box, 82: fixing member, 83: pulling rod, 9: feeding mechanism, 91: supporting frame, 92: conveyor belt, 93: servo motor. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0031] A device for printing characters on both sides of a circuit board, such as Figure 1 and Figure 2 As shown, it includes a base frame 1, an installation frame 2, a guide bar 3, a printing mechanism 4 and a placement mechanism 5. The front and rear parts of the base frame 1 are connected to the installation frames 2, and the guide bars 3 are connected to the sides of the installation frames 2 that are close to each other. The printing mechanism 4 is provided between the installation frames 2, and the placement mechanism 5 is also provided between the installation frames 2.

[0032] like Figure 1 and Figure 3As shown, the printing mechanism 4 includes a double-axis motor 41, a first screw rod 42, a guide rod 43, a first sliding member 44, a sleeve 45, a clamp 46, a first spring 47 and a printing plate 48. The double-axis motor 41 is connected to the side away from each other in the middle of the installation frame 2, the first screw rod 42 is connected to the output shaft of the double-axis motor 41, the middle of the installation frame 2 is connected to the guide rod 43, the upper and lower parts of the guide rod 43 are slidably connected to the first sliding member 44, the first sliding member 44 is threadedly connected to the adjacent first screw rod 42, the first sliding member 44 is connected to the sleeve 45, the sleeve 45 is slidably connected to the clamp 46, the clamp 46 is connected to the connected sleeve 45 with a first spring 47, and a printing plate 48 is clamped between two laterally adjacent clamps 46.

[0033] like Figure 1 and Figure 4 As shown, the placement mechanism 5 includes a second screw rod 51, a bidirectional motor 52, a transmission assembly 53, a second sliding member 54, a telescopic plate 55, a placement plate 56 and a second spring 57. The second screw rod 51 is rotatably connected inside the installation frame 2. The left side of the installation frame 2 on the front side is connected to the bidirectional motor 52. The output shaft on the right side of the bidirectional motor 52 is connected to the second screw rod 51 on the front side. A transmission assembly 53 is provided between the output shaft on the left side of the bidirectional motor 52 and the second screw rod 51 on the rear side. The transmission assembly 53 includes a transmission wheel and a belt. A transmission wheel is connected to the output shaft on the left side of the motor 52, and a transmission wheel is also connected to the left part of the second screw rod 51 on the rear side, and a belt is wound around the transmission wheels. The right part of the second screw rod 51 is threadedly connected to a second sliding member 54, and the second sliding members 54 are slidably connected to the adjacent guide strips 3. A telescopic plate 55 is slidably connected to the side where the second sliding members 54 are close to each other, and a placement plate 56 is connected to the side where the telescopic plates 55 are close to each other. A second spring 57 is connected between the telescopic plates 55 and the second sliding members 54 connected thereto.

[0034] When using the present invention, firstly, the chassis 1 is placed in the circuit board printing area, and then the circuit board is placed between the placement plates 56. Through the action of the second spring 57, the placement plates 56 clamp the circuit board, and then the bidirectional motor 52 is started to drive the second screw rod 51 on the front side to rotate. When the bidirectional motor 52 is started, the second screw rod 51 on the rear side is driven to rotate through the transmission wheel and belt in the transmission assembly 53, so that the second sliding member 54 moves along the guide bar 3, drives the telescopic plate 55 and the placement plate 56 to move, and transports the circuit board to between the printing plates 48. When the circuit board is transported to between the printing plates 48, the double-axis motor 41 is started to drive the first screw rod 42 to rotate, so that the first sliding member 44 moves along the guide rod 43 to move closer to each other, drives the sleeve 45 to move closer to each other, and through the action of the first spring 47, the clamp 46 clamps the printing plate 48, and then the printing plates 48 move closer to each other to print the front and back sides of the circuit board. Thereby, the circuit board can be transported and printed on the front and back sides of the circuit board at the same time.

[0035] like Figure 1 and Figure 5 As shown, it also includes a clamping mechanism 6, which includes a guide frame 61, a third sliding member 62, a fixed rod 63, a third spring 64 and a pressure frame 65. The guide frame 61 is connected to the side of the lower part of the installation frame 2 that is close to each other, and the lower sides of the left and right parts of the second sliding member 54 are connected to the fixed rod 63. A pressure frame 65 is slidably connected between two adjacent fixed rods 63. The third sliding member 62 is connected to the pressure frame 65. The third sliding member 62 is slidably matched with the adjacent guide frame 61, and the third spring 64 is connected between the pressure frame 65 and the connected fixed rod 63.

[0036] The clamping mechanism 6 of the device can be used to clamp the circuit board. When the second sliding member 54 moves, it drives the pressing frame 65 to move, so that the third sliding member 62 moves on the guide frame 61. When the third sliding member 62 moves to the lower part of the guide frame 61, it drives the pressing frame 65 to move downward on the fixing rod 63. The third spring 64 is stretched, so that the pressing frame 65 cooperates with the placement plate 56 to clamp the circuit board, thereby pressing the circuit board and preventing the circuit board from moving.

[0037] like Figure 1 and Figure 6As shown, it also includes a discharge mechanism 7, which includes a rotating frame 71, a spiral spring 72, a guide frame 73, a sliding frame 74, a multi-section cylinder 75 and a support plate 76. The left part of the base frame 1 is rotatably connected to the front and rear rotating frames 71, and the rotating frames 71 are connected to the base frame 1 with a spiral spring 72. The upper and lower guide frames 73 are connected to the front and rear sides of the left part of the base frame 1, and the sliding frame 74 is slidably connected between the guide frames 73. The rotating frames 71 are movably connected to the sliding frames 74. The lower left part of the base frame 1 is connected to the multi-section cylinder 75, and the telescopic end of the multi-section cylinder 75 is connected to the support plate 76. The support plate 76 is provided with an anti-skid groove to prevent the circuit board from slipping, and the support plate 76 is squeezed and fitted with the rotating frame 71.

[0038] The unloading mechanism 7 of the present device can be used to unload the circuit board from the placement plate 56. After the printing plate 48 has finished printing the circuit board, the circuit board continues to move to the support plate 76. At this time, the third slide 62 moves to the upper part of the guide frame 61, and the third spring 64 rebounds to reset the pressing frame 65 and no longer presses the circuit board. Then the multi-section cylinder 75 is started to move the support plate 76 upward, squeezing the placement plates 56 away from each other, so that the circuit board moves onto the support plate 76, and then the multi-section cylinder 75 is used to move the support plate 76 downward, so that the support plate 76 squeezes the rotating frame 71 to rotate, and the volute spring 72 is deformed. When the rotating frame 71 rotates, it pushes the sliding frame 74 to move on the guide frame 73, so that the sliding frame 74 pushes the circuit board away from the support plate 76, thereby automatically unloading the circuit board from the placement plate 56 and saving manpower. After the support plate 76 is separated from the rotating frame 71, the volute spring 72 is restored to reset the rotating frame 71.

[0039] like Figure 1 and Figure 7 As shown, a collecting mechanism 8 is also included, and the collecting mechanism 8 includes a collecting box 81, a fixing member 82 and a pull rod 83. The collecting box 81 is located on the left side of the base frame 1, and the collecting box 81 is placed on the ground. The lower sides of the front and rear parts of the collecting box 81 are provided with left and right moving wheels to facilitate the transportation of circuit boards. The front and rear sides of the collecting box 81 are connected to the fixing members 82, and the fixing members 82 are rotatably connected to the pull rods 83, and the pull rods 83 are snap-fitted with the base frame 1.

[0040] The collecting mechanism 8 of the device can be used to collect circuit boards. After the sliding frame 74 pushes the circuit boards away from the support plate 76, the circuit boards enter the collecting box 81. After the collecting box 81 is full, the pull rod 83 is rotated to separate the pull rod 83 from the base frame 1, and then the collecting box 81 is moved to the circuit board storage area to store the circuit boards. This makes it possible to collect the circuit boards, facilitate the transportation of the circuit boards, and improve the efficiency of circuit board printing.

[0041] like Figure 1 and Figure 8As shown, it also includes a feeding mechanism 9, which includes a support frame 91, a conveyor belt 92 and a servo motor 93. The support frame 91 is connected to the lower right part of the base frame 1, and two left and right transmission rollers are rotatably provided on the upper part of the support frame 91. The conveyor belt 92 is wound around the transmission rollers. The servo motor 93 is connected to the front side of the right part of the support frame 91, and the output shaft of the servo motor 93 is connected to the transmission roller on the right side.

[0042] By using the loading mechanism 9 of the device, the circuit boards can be automatically loaded, and the produced circuit boards can be moved to the conveyor belt 92. Then the servo motor 93 is started to drive the transmission roller to rotate, so that the conveyor belt 92 rotates to transfer the circuit boards to the placement plates 56 for clamping, thereby automatically loading the circuit boards, saving manpower, and improving the efficiency of circuit board printing.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for printing characters on both sides of a circuit board, characterized in that: The invention comprises a base frame (1), an installation frame (2), a guide bar (3), a printing mechanism (4) and a placement mechanism (5); the front and rear parts of the base frame (1) are both connected to the installation frame (2); the guide bar (3) is connected to the sides of the installation frames (2) that are close to each other; a printing mechanism (4) capable of printing on the front and back sides of a circuit board is arranged between the installation frames (2); and a placement mechanism (5) capable of conveying the circuit board is also arranged between the installation frames (2).

2. A circuit board character front and back alignment printing device according to claim 1, characterized in that: The printing mechanism (4) comprises a double-axis motor (41), a first screw rod (42), a guide rod (43), a first sliding member (44), a sleeve (45), a clamp (46), a first spring (47) and a printing plate (48). The double-axis motor (41) is connected to one side of the middle of the installation frame (2) away from each other. The output shaft of the double-axis motor (41) is connected to the first screw rod (42). The middle of the installation frame (2) is connected to the guide rod (43). The upper and lower parts of the guide rod (43) are slidably connected to the first sliding member (44). The first sliding member (44) is threadedly connected to the adjacent first screw rod (42). The first sliding member (44) A sleeve (45) is connected to each of the sleeves (45), and a clamp (46) is slidably connected to each of the sleeves (45). A first spring (47) is connected between each of the clamps (46) and the connected sleeves (45). A printed board (48) is clamped between two laterally adjacent clamps (46). The dual-axis motor (41) is started to drive the first screw rod (42) to rotate, so that the first sliding member (44) moves along the guide rod (43) to approach each other, driving the sleeves (45) to approach each other. Through the action of the first spring (47), the clamp (46) clamps the printed board (48), and then the printed boards (48) approach each other to perform alignment printing on the front and back sides of the circuit board.

3. A circuit board character front and back alignment printing device according to claim 2, characterized in that: The placement mechanism (5) comprises a second screw rod (51), a bidirectional motor (52), a transmission assembly (53), a second sliding member (54), a telescopic plate (55), a placement plate (56) and a second spring (57); the second screw rod (51) is rotatably connected inside the installation frame (2); the left side of the front installation frame (2) is connected to the bidirectional motor (52); the output shaft on the right side of the bidirectional motor (52) is connected to the second screw rod (51) on the front side; a transmission assembly (53) is provided between the output shaft on the left side of the bidirectional motor (52) and the second screw rod (51) on the rear side; the right part of the second screw rod (51) is threadedly connected to the second sliding member (54); the second sliding member (54) is slidably connected to the adjacent guide bar (3); the second sliding member (54) ) are slidably connected with a telescopic plate (55) on one side where they are close to each other, and a placement plate (56) is connected on one side where the telescopic plates (55) are close to each other. A second spring (57) is connected between the telescopic plates (55) and the second sliding member (54) connected thereto. The circuit board is placed between the placement plates (56), and the placement plates (56) clamp the circuit board through the action of the second spring (57). Then, the bidirectional motor (52) is started to drive the second screw rod (51) on the front side to rotate. When the bidirectional motor (52) is started, the second screw rod (51) on the rear side is driven to rotate through the transmission assembly (53), so that the second sliding member (54) moves along the guide bar (3), driving the telescopic plate (55) and the placement plate (56) to move.

4. A circuit board character front and back alignment printing device according to claim 3, characterized in that: The transmission assembly (53) includes a transmission wheel and a belt. The output shaft on the left side of the bidirectional motor (52) is connected to the transmission wheel. The left part of the second screw rod (51) at the rear side is also connected to the transmission wheel. A belt is wound around the transmission wheels.

5. The device for printing characters on both sides of a circuit board according to claim 3, characterized in that: The invention also comprises a clamping mechanism (6), the clamping mechanism (6) comprising a guide frame (61), a third sliding member (62), a fixing rod (63), a third spring (64) and a clamping frame (65), the guide frame (61) is connected to the side of the lower part of the installation frame (2) close to each other, the fixing rod (63) is connected to the lower side of the left and right parts of the second sliding member (54), the clamping frame (65) is slidably connected between two adjacent fixing rods (63), the clamping frame (65) is connected to the third sliding member (62), and the third sliding member ( The third sliding member (62) is slidably matched with the adjacent guide frame (61), and the pressing frame (65) is connected to the connected fixed rod (63) by a third spring (64). When the second sliding member (54) moves, the pressing frame (65) is driven to move, so that the third sliding member (62) moves on the guide frame (61). When the third sliding member (62) moves to the lower part of the guide frame (61), it drives the pressing frame (65) to move downward on the fixed rod (63), so that the pressing frame (65) cooperates with the placement plate (56) to clamp the circuit board.

6. A circuit board character front and back alignment printing device according to claim 5, characterized in that: The invention also comprises a discharge mechanism (7), which comprises a rotating frame (71), a spiral spring (72), a guide frame (73), a sliding frame (74), a multi-section cylinder (75) and a support plate (76). The left part of the base frame (1) is rotatably connected to two front and rear rotating frames (71), and the rotating frames (71) are connected to the base frame (1) with spiral springs (72). The front and rear sides of the left part of the base frame (1) are connected to two upper and lower guide frames (73), and the sliding frame (74) is slidably connected between the guide frames (73). The rotating frames (71) are connected to the base frame (1) with spiral springs (72). The bottom left part of the bottom frame (1) is connected to a multi-section cylinder (75), and a support plate (76) is connected to the telescopic end of the multi-section cylinder (75). The support plate (76) is pressed and matched with the rotating frame (71). The support plate (76) is moved downward by the multi-section cylinder (75), so that the support plate (76) presses the rotating frame (71) to rotate, and the spiral spring (72) is deformed. When the rotating frame (71) rotates, the sliding frame (74) is pushed to move on the guide frame (73), so that the sliding frame (74) pushes the circuit board away from the support plate (76).

7. A circuit board character front and back alignment printing device according to claim 6, characterized in that: The supporting plate (76) is provided with an anti-skid groove.

8. The device for printing characters on both sides of a circuit board according to claim 6, characterized in that: The invention also comprises a collecting mechanism (8), which comprises a collecting box (81), a fixing member (82) and a pull rod (83). The collecting box (81) is located on the left side of the base frame (1). The collecting box (81) is placed on the ground. The front and rear sides of the collecting box (81) are connected with fixing members (82). The fixing members (82) are rotatably connected with pull rods (83). The pull rods (83) are engaged with the base frame (1). After the sliding frame (74) pushes the circuit board away from the support plate (76), the circuit board enters the collecting box (81). After the collecting box (81) is full, the pull rod (83) is rotated to separate the pull rod (83) from the base frame (1), and then the collecting box (81) is moved to the circuit board storage area.

9. A circuit board character front and back alignment printing device according to claim 8, characterized in that: The lower sides of the front and rear parts of the collecting box (81) are both provided with left and right moving wheels.

10. The device for printing characters on both sides of a circuit board according to claim 8, characterized in that: The invention also comprises a feeding mechanism (9), which comprises a support frame (91), a conveyor belt (92) and a servo motor (93). The lower right part of the base frame (1) is connected to the support frame (91), and the upper part of the support frame (91) is rotatably provided with two left and right transmission rollers, and the conveyor belt (92) is wound around the transmission rollers. The front right part of the support frame (91) is connected to the servo motor (93), and the output shaft of the servo motor (93) is connected to the transmission roller on the right side. When the servo motor (93) is started, the transmission roller is driven to rotate, so that the conveyor belt (92) rotates to transmit the circuit board to between the placement plates (56) for clamping.

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