Circuit board automatic jet printing machine

Abstract

The utility model relates to the technical field of circuit board production equipment, in particular to an automatic jet printing machine for a circuit board, which comprises a machine table, a clamp assembly, a jet printing assembly and a positioning assembly, two stations are arranged on the machine table, an X-axis moving assembly is arranged in each station, and the clamp assembly comprises a bottom plate, two positioning strips, two clamping strips and a driving mechanism. The X-axis sliding block and the X-axis nut seat are both fixed to the bottom face of the bottom plate, a plurality of positioning pins arranged in a single row are arranged on the top face of the positioning strip, a plurality of clamping pins arranged in a single row are arranged on the top face of the clamping strip, winding wheels are arranged at the two ends of the bottom face of the clamping strip respectively, and the driving mechanism comprises a power piece and an inhaul cable. One end of the inhaul cable bypasses the reel of the clamping strip and is fixed to the bottom plate, the other end of the inhaul cable is connected to the power piece, and the positioning assembly comprises a correlation type photoelectric sensor. The automatic jet printing machine for the circuit board is automatic in operation and high in positioning precision, and the production efficiency and the yield are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board production equipment, in particular to an automatic spray printer for circuit boards. Background Art

[0002] The manufacturing process for printed circuit boards (PCBs) includes a character printing process, where component identification codes, such as resistance R, cycle number, and UL number, are printed on the PCB surface. Traditionally, this process uses stencil screen printing, which is inefficient, with a lengthy process from printing to curing, significant material loss, and environmental pollution. Consequently, digital inkjet printing technology for PCBs has rapidly developed in recent years. However, the characters on PCBs are small and require extremely high positioning accuracy. Any deviation from the PCB's position can cause the printed characters to shift or even be printed on holes in the PCB, impacting electrical performance. Current printers have limited positioning accuracy, limited application scope, and time-consuming adjustments, resulting in low production efficiency and yield rates. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an automatic circuit board printer that adopts a dual positioning structure to accurately position the circuit board and the printing head, thereby improving production efficiency and yield rate.

[0004] The automatic circuit board printer according to the embodiment of the first aspect of the present invention includes a machine platform, a fixture assembly, a printing assembly and a positioning assembly, two workstations are arranged on the machine platform, and an X-axis moving assembly is arranged in each of the workstations, the X-axis moving assembly includes an X-axis slide rail and a servo motor, the X-axis slide rail is connected to an X-axis slider, the servo motor is connected to an X-axis lead screw, an X-axis nut seat is installed on the X-axis lead screw, the X-axis lead screw and the X-axis slide rail are arranged in parallel, the upper end face of the machine platform is connected to a machine cover, and the machine cover covers the rear halves of the two workstations; the fixture assembly includes a base plate, two clamping bars and a driving mechanism, the X-axis slider and the X-axis nut seat are fixed to the bottom surface of the base plate, the top surface of the clamping bar is provided with a plurality of clamping pins arranged in a single row, a row of positioning pins and a column of positioning pins perpendicular to each other are provided on the base plate, and a row of positioning pins perpendicular to each other are provided on the base plate A first adjustment hole and a row of second adjustment holes, wherein the multiple clamping pins of one of the clamping bars are passed through the first adjustment hole, and the multiple clamping pins of the other clamping bar are passed through the second adjustment hole, the first adjustment hole and the second adjustment hole are both oblong holes, the first adjustment hole is arranged along the X-axis, the driving mechanism includes an electric push rod, and each of the clamping bars is connected to one electric push rod; the printing assembly is located inside the machine cover, the printing assembly includes a printing head, a Y-axis driving mechanism and a Z-axis driving mechanism, the Y-axis driving mechanism drives the Z-axis driving mechanism to move along the Y-axis, and the Z-axis driving mechanism drives the printing head to move along the Z-axis; the positioning assembly includes a through-type photoelectric sensor, the transmitter of the through-type photoelectric sensor is fixed to the printing head, the receiver of the through-type photoelectric sensor is fixed to the machine platform, and the bottom plate is provided with a positioning hole for the rays of the transmitter to pass through.

[0005] The automatic circuit board printer according to the first embodiment of the present invention has at least the following beneficial effects:

[0006] The circuit board is placed on the base plate of the fixture assembly. Two adjacent sides of the circuit board respectively abut against the positioning pins. Then, the electric push rod pushes the two clamping bars to move so that the clamping pins on the two clamping bars respectively abut against the other two adjacent sides of the circuit board, thereby fixing the circuit board. The servo motor drives the X-axis nut seat through the X-axis screw. The X-axis nut seat drives the fixture assembly to the printing position. The print head is also driven to the printing position by the Y-axis drive mechanism and the Z-axis drive mechanism. The positioning assembly is used to determine whether the position of the circuit board is accurate. The transmitter of the beam-type photoelectric sensor emits rays. If the rays can pass through the alignment hole of the base plate and are received by the receiver, printing is performed. The automatic circuit board printer has the advantages of high positioning accuracy and automated operation, which can greatly improve production efficiency and yield rate.

[0007] According to some embodiments of the present utility model, the base plate is connected to two positioning bars, the top surface of the positioning bar is provided with a plurality of positioning pins arranged in a single row, and the base plate is provided with a row of first positioning holes and a column of second positioning holes perpendicular to each other, wherein the plurality of positioning pins of one of the positioning bars are passed through the first positioning holes, and the plurality of positioning pins of the other positioning bar are passed through the second positioning holes.

[0008] According to some embodiments of the present invention, the positioning assembly further includes an electric push rod, which is fixed to the machine platform. The output end of the electric push rod is provided with a pin, and the bottom plate is provided with a positioning pin hole that cooperates with the pin.

[0009] According to some embodiments of the present invention, two of the latches are provided at the output end of the electric push rod, a gap is provided between the two latches, and a cross section of one of the latches is square.

[0010] According to some embodiments of the present invention, a pressure cap is provided at the upper end of the positioning pin, and the diameter of the pressure cap is larger than the first positioning hole and the second positioning hole.

[0011] According to some embodiments of the present invention, the bottom plate is connected to a pressure plate cylinder, and the piston rod of the pressure plate cylinder is connected to the positioning bar and can drive the positioning bar to rise and fall.

[0012] According to some embodiments of the present invention, a pin cap is provided at the upper end of the clamping pin, the diameter of the pin cap is larger than the first adjustment hole and the second adjustment hole, and the upper and lower end surfaces of the pin cap are both provided with chamfered corners.

[0013] According to some embodiments of the present invention, the print head is connected to a laser rangefinder, and the laser rangefinder is fixed to the outer wall of the print head and faces downward.

[0014] According to some embodiments of the present invention, the Z-axis drive mechanism is connected to a UV curing lamp, there are two UV curing lamps, and the two UV curing lamps are distributed on both sides of the print head along the Y-axis direction, and the two UV curing lamps are electrically connected to the Y-axis drive mechanism.

[0015] According to some embodiments of the present invention, the circuit board is provided with a through hole, which corresponds to the position of the alignment hole and can allow the ray of the emitter to pass through.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0018] Figure 1 This is a schematic structural diagram of an automatic circuit board printer according to some embodiments of the present invention;

[0019] Figure 2 This is an exploded schematic diagram of an automatic circuit board printer according to some embodiments of the present invention;

[0020] Figure 3 sectional views of automatic circuit board printers according to some embodiments of the present invention;

[0021] Figure 4 for Figure 3 A local enlarged view of point A in FIG;

[0022] Figure 5 A top view of a clamp assembly in some embodiments of the present invention;

[0023] Figure 6 is a bottom view of a clamp assembly in some embodiments of the present invention;

[0024] Figure 7 Schematic diagram of the exploded view of the clamp assembly in some embodiments of the present invention.

[0025] The accompanying figures are as follows:

[0026] Machine 100, workstation 101, X-axis moving assembly 110, X-axis slide rail 111, X-axis slider 112, servo motor 113, X-axis screw rod 114, X-axis nut seat 115, machine cover 120;

[0027] Clamp assembly 200, base plate 210, first positioning hole 211, second positioning hole 212, first adjustment hole 213, second adjustment hole 214, alignment hole 215, positioning bar 220, positioning pin 221, pressure cap 222, clamping bar 230, clamping pin 231, pin cap 233, electric push rod 240;

[0028] Printing assembly 300, printing head 310, Y-axis driving mechanism 320, Z-axis driving mechanism 330, UV curing lamp 331;

[0029] Positioning component 400 , transmitter 411 , receiver 412 . DETAILED DESCRIPTION

[0030] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0032] In the description of this utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0034] Reference Figures 1 to 7 The first embodiment of the present invention provides an automatic circuit board printer, comprising a machine platform 100, a fixture assembly 200, a printing assembly 300, and a positioning assembly 400. The machine platform 100 is provided with two workstations 101, which can be operated alternately by one worker, thereby reducing downtime and improving production efficiency. An X-axis moving assembly 110 is arranged in each workstation 101. The X-axis moving assembly 110 includes an X-axis slide rail 111 and a servo motor 113. The X-axis slide rail 111 is connected to an X-axis slider 112. The servo motor 113 is connected to an X-axis screw rod 114. An X-axis nut seat 115 is installed on the X-axis screw rod 114. The X-axis screw rod 114 is arranged parallel to the X-axis slide rail 111. The servo motor 113 drives the X-axis screw rod 114 to rotate, and drives the X-axis nut seat 115 to move through the thread. The servo motor 113 can accurately control the movement distance of the X-axis nut seat 115. A hood 120 is attached to the upper end of the machine platform 100, covering the rear halves of the two workstations 101. The interior of hood 120 is a hollow cavity, where the circuit boards are printed. This prevents external airflow from affecting the printing process, reduces contamination, and helps protect the printing assembly 300 and the circuit boards. Hood 120 can be provided with a transparent window for observing the printing process.

[0035] Each station 101 is provided with a fixture assembly 200, such as Figures 5 to 7 As shown, the fixture assembly 200 includes a base plate 210, two clamping bars 230 and a driving mechanism. The X-axis slider 112 and the X-axis nut seat 115 are both fixed to the bottom surface of the base plate 210. The base plate 210 is driven to move by the X-axis nut seat 115. The X-axis slider 112 moves on the X-axis slide rail 111 to guide the movement of the base plate 210. Usually, each workstation 101 has two X-axis slide rails 111, which are distributed on both sides of the base plate 210 to stably support the fixture assembly 200 and the circuit board, which is conducive to ensuring the horizontality of the circuit board and improving the accuracy of printing.

[0036] The top surface of the clamping bar 230 is provided with a plurality of clamping pins 231 arranged in a single row. Correspondingly, the bottom plate 210 is provided with a row of first adjustment holes 213 and a column of second adjustment holes 214 perpendicular to each other. The plurality of clamping pins 231 of one clamping bar 230 are passed through the first adjustment holes 213, and the plurality of clamping pins 231 of the other clamping bar 230 are passed through the second adjustment holes 214. The first adjustment holes 213 and the second adjustment holes 214 are both oblong holes. The plurality of clamping pins 231 of the clamping bar 230 can move in the first adjustment holes 213 or the second adjustment holes 214 to adjust the position. The first adjustment holes 213 are arranged along the X-axis, and the second adjustment holes 214 are arranged along the Y-axis. A row of positioning pins 221 and a column of positioning pins 231 perpendicular to each other are provided on the bottom plate 210. The driving mechanism includes an electric push rod 240, which pushes the clamping bar 230 to move, thereby clamping the circuit board.

[0037] like Figure 3 and Figure 4 As shown, the printing assembly 300 is arranged inside the hood 120. The printing assembly 300 includes a print head 310, a Y-axis drive mechanism 320, and a Z-axis drive mechanism 330. The Y-axis drive mechanism 320 drives the Z-axis drive mechanism 330 to move along the Y-axis, and the Z-axis drive mechanism 330 drives the print head 310 to move along the Z-axis. The Y-axis drive mechanism 320 can be composed of a motor and a linear module. The motor can be a servo motor, a stepper motor, etc. The Z-axis drive mechanism 320 can be composed of a motor and a linear module. The motor can be a servo motor, a stepper motor, etc. During the printing process, the Y-axis drive mechanism 320 drives the Z-axis drive mechanism 330 and the print head 310 to move back and forth, and the servo motor 113 drives the fixture assembly 200 and the circuit board to advance row by row to complete the printing operation.

[0038] Taking into account the high requirements for the initial position accuracy between the circuit board and the print head 310, the positioning component 400 of the automatic circuit board printer includes a through-beam photoelectric sensor. The emitter 411 of the through-beam photoelectric sensor is fixed to the print head 310, and the receiver 412 of the through-beam photoelectric sensor is fixed to the machine 100. The base plate 210 is provided with a positioning hole 215 for the rays of the emitter 411 to pass through. The position of the base plate 210 and the circuit board must be accurate for the through-beam photoelectric sensor to realize through-beam detection and perform printing operations.

[0039] The working process of the automatic circuit board printer is as follows: the worker places the circuit board on the base plate 210 of the fixture assembly 200. The circuit board is usually rectangular, and two adjacent sides of the circuit board respectively abut against a row of positioning pins 221 and a column of positioning pins 221. Then the electric push rod 240 pushes the clamping bar 230 to move, so that the clamping pins 231 of the two clamping bars 230 move against the other two adjacent sides of the circuit board, thereby fixing the circuit board and accurately defining the position of the circuit board. Servo motor 113 drives X-axis nut holder 115 via X-axis screw 114. X-axis nut holder 115 drives fixture assembly 200 to the printing position. Print head 310, driven by Y-axis drive mechanism 320 and Z-axis drive mechanism 330, also moves to the printing position. Positioning assembly 400 determines the accuracy of the circuit board's position. Transmitter 411 of the through-beam photoelectric sensor emits radiation. If the radiation passes through alignment hole 215 of base plate 210 and is received by receiver 412, the relative position of the circuit board and print head 310 is correct, and printing can proceed. If the radiation fails to pass through alignment hole 215 of base plate 210 and is received by receiver 412, the relative position of the circuit board and print head 310 is incorrect, an alarm is triggered, and a worker is required to adjust the fixture or the starting position coordinates of the print head 310 until the positioning assembly 400 obtains the correct detection result before printing can proceed. This automatic circuit board printer offers the advantages of high positioning accuracy and automated operations, significantly improving production efficiency and yield rate.

[0040] It can be understood that a through hole corresponding to the alignment hole 215 is provided on the circuit board. When the through-type photoelectric sensor performs detection, the emitter 411 of the through-type photoelectric sensor emits rays, which can pass through the alignment hole 215 of the base plate 210 and the through hole of the circuit board, and then be received by the receiver 412, indicating that the relative position of the circuit board and the print head 310 is accurate, and the alignment effect is better.

[0041] It is understood that in some embodiments, the base plate 210 is connected to two positioning bars 220, and a plurality of positioning pins 221 are arranged in a single row on the top surface of the positioning bars 220. A row of first positioning holes 211 and a column of second positioning holes 212 are provided on the base plate 210, which are perpendicular to each other. The plurality of positioning pins 221 of one positioning bar 220 are inserted into the first positioning holes 211, and the plurality of positioning pins 221 of the other positioning bar 220 are inserted into the second positioning holes 212. The row of first adjustment holes 213 is parallel to the arrangement direction of the row of first positioning holes 211, and the row of first adjustment holes 213 and the row of first positioning holes 211 may correspond one-to-one or may be staggered. The row of second adjustment holes 214 is parallel to the arrangement direction of the row of second positioning holes 212, and the row of second adjustment holes 214 and the row of second positioning holes 212 may correspond one-to-one or may be staggered.

[0042] It can be understood that in some embodiments of the present invention, taking into account the different thicknesses of circuit boards of different specifications, in order to adapt to circuit boards of various thicknesses, a pressure plate cylinder is connected to the base plate 210, and the piston rod of the pressure plate cylinder is connected to the positioning bar 220, and can drive the positioning bar 220 to rise and fall. After the circuit board is placed on the base plate 210, the two adjacent sides of the circuit board are first respectively abutted against the positioning pins 221 of the two positioning bars 220, and then the pressure plate cylinder is actuated, and the pressure plate cylinder drives the positioning bar 220 to descend, and the pressure cap 222 is used to press the circuit board to prevent the circuit board from loosening and shifting, which helps to fix the circuit board and improve the accuracy of printing.

[0043] It will be appreciated that in some embodiments of the present invention, the positioning assembly 400 further includes an electric push rod, which is fixed to the machine platform 100. A latch is provided at the output end of the electric push rod, and a positioning pin hole is provided on the base plate 210 to cooperate with the latch. The cooperation between the latch and the positioning pin hole can help detect the accuracy of the relative position of the circuit board and the print head 310. If the base plate 210 and the circuit board are not positioned correctly, the latch cannot be inserted into the positioning pin hole. Furthermore, during the printing process, the latch inserted into the positioning pin hole helps to define the base plate 210 and the circuit board, preventing displacement and facilitating the printing operation.

[0044] Furthermore, two pins are provided at the output end of the electric push rod, with a gap between the two pins. The cross section of one of the pins can be made square, which can prevent the bottom plate 210 and the circuit board from angular deflection and improve the positioning accuracy.

[0045] It will be appreciated that in some embodiments of the present invention, a pressure cap 222 is provided at the upper end of the positioning pin 221. The pressure cap 222 has a diameter larger than that of the first positioning hole 211 and the second positioning hole 212. The pressure cap 222 can press against the top surface of the circuit board, helping to secure the circuit board and prevent displacement. In addition, the pressure cap 222 prevents the positioning pin 221 from falling out of the first positioning hole 211 or the second positioning hole 212, facilitating ease of use.

[0046] It is understandable that in some embodiments of the present invention, such as Figure 7 As shown, a cap 233 is provided at the upper end of the clamping pin 231. The diameter of the cap 233 is larger than the diameters of the first adjustment hole 213 and the second adjustment hole 214, that is, the diameter of the cap 233 is larger than the diameter of the clamping pin 231. The cap 233 can press against the upper end surface of the circuit board to prevent the circuit board from moving or shaking. To reduce collisions during the movement of the clamping bar 230, the upper and lower end surfaces of the cap 233 are provided with rounded corners to facilitate the circuit board's entry into the gap between the cap 233 and the base plate 210. The cap 233 can be a separate component, mounted on the upper end of the clamping pin 231 through an interference fit. The cap 233 can be made of a material such as rubber with a relatively high hardness and a slight elasticity. When pressing against the circuit board, the elasticity helps to secure the circuit board.

[0047] It can be understood that in some embodiments of the present invention, the print head 310 is also connected to a laser rangefinder, which is fixed to the outer wall of the print head 310 and faces downward. After the print head 310 is driven by the Y-axis drive mechanism 320 and the Z-axis drive mechanism 330 to move to the printing position, the distance between the print head 310 and the circuit board is detected by the laser rangefinder. The detection data is used to determine whether the distance between the print head 310 and the circuit board is within a set range. If it is within the set range, printing is performed. If it is not within the set range, an alarm is issued to notify the worker to adjust the automatic circuit board printer to prevent problems such as unclear printed characters due to excessive distance.

[0048] It will be appreciated that in some embodiments of the present invention, the Z-axis drive mechanism 330 is connected to a UV curing lamp 331. The UV curing lamp 331 helps solidify and cure the printed characters. Considering that the print head 310 can move in two directions along the Y-axis, two UV curing lamps 331 are used, and these lamps are located on either side of the print head 310 along the Y-axis. Regardless of which direction the print head 310 moves, the UV curing lamp 331 provides irradiation. The two UV curing lamps 331 can be permanently on after the printing operation begins, or they can be independently controlled. The two UV curing lamps 331 are electrically connected to the Y-axis drive mechanism 320. Depending on the direction of movement of the Y-axis drive mechanism 320, the UV curing lamp 331 behind the print head 310 is turned on, allowing printing to proceed before light curing. The hood 120 can help shield the light from the UV curing lamp 331, reducing light pollution. Furthermore, the UV curing lamp 331 is provided with a light guide to confine the light within a certain range, enhancing the curing effect.

[0049] It is understandable that, considering that when printing the last two lines of characters, the print head is close to the edge of the circuit board, the printed characters are prone to blurring. The printing process is as follows: the Y-axis drive mechanism 320 drives the print head 310 to move back and forth along the Y-axis for continuous printing. After printing the last two lines, the Y-axis drive mechanism 320 drives the print head 310 to move unidirectionally along the Y-axis (and no printing is performed when moving in the reverse direction), and the movement speed is reduced by 30% to 50%. By reducing the speed and unidirectional movement, the printing speed is reduced, the characters are made clearer, and the problem of blurred characters is eliminated.

[0050] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Automatic circuit board printer, characterized by: include: A machine platform, wherein two workstations are provided on the machine platform, and an X-axis moving assembly is arranged in each of the workstations, and the X-axis moving assembly includes an X-axis slide rail and a servo motor, the X-axis slide rail is connected to an X-axis slider, the servo motor is connected to an X-axis lead screw, and an X-axis nut seat is installed on the X-axis lead screw, the X-axis lead screw and the X-axis slide rail are arranged in parallel, and an organic cover is connected to the upper end surface of the machine platform, and the organic cover covers the rear half of the two workstations; The clamp assembly includes a base plate, two clamping bars and a driving mechanism, the X-axis slider and the X-axis nut seat are fixed to the bottom surface of the base plate, the top surface of the clamping bar is provided with a plurality of clamping pins arranged in a single row, the base plate is provided with a row of positioning pins and a column of positioning pins perpendicular to each other, the base plate is provided with a row of first adjustment holes and a column of second adjustment holes perpendicular to each other, the plurality of clamping pins of one of the clamping bars are passed through the first adjustment holes, and the plurality of clamping pins of the other clamping bar are passed through the second adjustment holes, the first adjustment hole and the second adjustment hole are both oblong holes, the first adjustment hole is arranged along the X-axis, the driving mechanism includes an electric push rod, and each of the clamping bars is connected to one of the electric push rods; A printing assembly is located inside the hood, the printing assembly including a printing head, a Y-axis drive mechanism and a Z-axis drive mechanism, the Y-axis drive mechanism drives the Z-axis drive mechanism to move along the Y-axis, and the Z-axis drive mechanism drives the printing head to move along the Z-axis; The positioning component includes a through-beam photoelectric sensor, a transmitter of the through-beam photoelectric sensor is fixed to the printing head, a receiver of the through-beam photoelectric sensor is fixed to the machine platform, and the bottom plate is provided with a positioning hole for the rays of the transmitter to pass through.

2. The automatic printing machine for circuit boards according to claim 1, characterized in that: The bottom plate is connected to two positioning bars, and the top surface of the positioning bar is provided with a plurality of positioning pins arranged in a single row. The bottom plate is provided with a row of first positioning holes and a column of second positioning holes perpendicular to each other. The plurality of positioning pins of one positioning bar are passed through the first positioning holes, and the plurality of positioning pins of the other positioning bar are passed through the second positioning holes.

3. The automatic printing machine for circuit boards according to claim 2, characterized in that: The positioning assembly further comprises an electric push rod, which is fixed to the machine platform. An output end of the electric push rod is provided with a latch, and the bottom plate is provided with a positioning pin hole that matches the latch.

4. The automatic printing machine for circuit boards according to claim 3, characterized in that: Two latches are provided at the output end of the electric push rod, with a gap between the two latches, and a cross section of one of the latches is square.

5. The automatic printing machine for circuit boards according to claim 2, characterized in that: A pressure cap is provided at the upper end of the positioning pin, and the diameter of the pressure cap is larger than the first positioning hole and the second positioning hole.

6. The automatic printing machine for circuit boards according to claim 5, characterized in that: The bottom plate is connected to a pressure plate cylinder, and the piston rod of the pressure plate cylinder is connected to the positioning bar and can drive the positioning bar to rise and fall.

7. The automatic printing machine for circuit boards according to claim 6, characterized in that: A pin cap is provided at the upper end of the clamping pin, the diameter of the pin cap is larger than the first adjustment hole and the second adjustment hole, and the upper end surface and the lower end surface of the pin cap are both provided with chamfered corners.

8. The automatic circuit board printer according to claim 1, characterized in that: The printing head is connected to a laser rangefinder, which is fixed on the outer wall of the printing head and faces downward.

9. The automatic circuit board printer according to claim 8, characterized in that: The Z-axis driving mechanism is connected to a UV curing lamp. There are two UV curing lamps, and the two UV curing lamps are distributed on both sides of the printing head along the Y-axis direction. The two UV curing lamps are electrically connected to the Y-axis driving mechanism.

10. The automatic printing machine for circuit boards according to claim 1, characterized in that: The circuit board is provided with a through hole, which corresponds to the position of the alignment hole and can allow the rays of the emitter to pass through.

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