WO2021109451A1

WO2021109451A1 - Screen-printing machine and calibration method for screen-printing screen frame

Info

Publication number: WO2021109451A1
Application number: PCT/CN2020/089429
Authority: WO
Inventors: 李读伦
Original assignee: 珠海镇东有限公司
Priority date: 2019-12-03
Filing date: 2020-05-09
Publication date: 2021-06-10
Also published as: CN111038074A; CN111038074B

Abstract

Disclosed are a screen-printing machine and a calibration method for a screen-printing screen frame. The screen-printing machine comprises a plate aligning mechanism, a platform, a visual positioning mechanism, a printing mechanism, a screen frame rack and a controller. The screen frame rack comprises a screen frame clamping mechanism and a screen frame adjusting mechanism, and the screen frame clamping mechanism is arranged on the screen frame adjusting mechanism. The screen frame adjusting mechanism comprises an X1 supporting rod, an X2 supporting rod, a Y1 supporting rod and a Y2 supporting rod, which are sequentially and movably connected end to end to form a closed rectangle. The screen frame adjusting mechanism further comprises an X1 driving device, an X2 driving device, a Y1 driving device and a Y2 driving device, which drive the X1 supporting rod and the X2 supporting rod to move respectively. According to the screen-printing machine of the technical solution above, same can achieve semi-automatic calibration of a screen-printing screen frame, can simultaneously achieve the effects of angle adjustment and position correction, and can improve calibration efficiency and precision.

Description

Calibration method of screen printing machine and screen frame

Technical field

The invention relates to the field of printing technology, in particular to a screen printing machine, and also to a method for calibrating a screen printing screen frame.

Background technique

Screen printing technology or simply screen printing technology has a long history and relatively mature automation solutions, so it is widely used in all walks of life. Among them, in the fields of new energy and consumer electronics products, the printing accuracy is relatively high, so it is necessary to calibrate the screen frame before printing. Traditional calibration methods are often adjusted manually, and the accuracy is gradually improved through repeated printing and repeated measurements. This method takes time to adjust and wastes a lot of raw materials.

Summary of the invention

The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a screen printing machine that can improve the calibration efficiency and accuracy of the screen printing screen frame.

The invention also provides a method for calibrating the screen printing screen frame, which can reduce the waste of raw materials during calibration.

According to an embodiment of the first aspect of the present invention, there is provided a screen printing machine, including: a board alignment mechanism; a platform provided on the board alignment mechanism for placing a substrate; a visual positioning mechanism provided on the board alignment mechanism One end of the mechanism is used to collect the visual information of the substrate; the printing mechanism is arranged on the plate matching mechanism and is used to print the printing pattern on the substrate; the net frame includes a net frame clamping mechanism And a screen frame adjustment mechanism, the screen frame clamping mechanism is arranged on the screen frame adjustment mechanism, the screen frame adjustment mechanism is connected with the printing mechanism, and the screen frame adjustment mechanism includes the end-to-end movable connection to form a closed Rectangular X1 support rods, X2 support rods, Y1 support rods, and Y2 support rods. The screen frame adjustment mechanism further includes X1 drive devices, X2 drive devices, and Y1 drive devices that drive the X1 support rods and X2 support rods to move, respectively. And Y2 driving device; controller, used for data calculation processing and screen printing machine control; wherein the flat plate can move back and forth on the plate-aligning mechanism under the visual positioning mechanism and the printing mechanism.

According to the screen printing machine of the embodiment of the present invention, the deviation is captured visually, and the deviation value is automatically calculated. The net frame automatically adjusts the relative position relationship of the four support rods according to the deviation value to realize the automatic correction of the net frame. Since the four support rods of the screen frame adjustment mechanism are movably connected, the positions of the X1 support rods and the X2 support rods can be driven by the four driving devices to achieve the effects of angle correction and position correction at the same time. Compared with the traditional method of first adjusting the position deviation and then adjusting the angle deviation, the two adjustments affect each other, which can improve the calibration efficiency and accuracy.

According to some embodiments of the present invention, the screen frame clamping mechanism includes two screen frame clamping rods with the same structure, and the screen frame clamping rod includes a clamping rod body and a clamping frame arranged at the bottom of the clamping rod body. A backing plate and a frame pressing cylinder arranged on the clamping rod body, a pressing plate is arranged at the top of the piston rod of the pressing frame cylinder, and the left and right frames of the silk screen frame are clamped on the pressing plate and the clamping frame cushion Between the plates, two ends of the clamping rod body are respectively provided with clamping frame cylinders, the clamping frame cylinders are arranged on the clamping rod body through the clamping frame cylinder seat, and the clamping frame cylinder seat is provided with The piston rod of the clamp frame cylinder extends through a through hole, and the X1 support rod and the X2 support rod are clamped between the clamp rod body and the clamp frame cylinder seat, respectively.

According to some embodiments of the present invention, both ends of the X2 support rod are provided with X-direction waist holes, and the X2 support rods respectively pass through the X-direction waist holes with the Y1 support rod and the Y2 support rod. Screw connection.

According to some embodiments of the present invention, a guide plate is provided on one side of the X2 support rod, a guide groove is provided on the clamp frame cylinder seat for clamping the X2 support rod, and the guide plate penetrates In the guide groove.

According to some embodiments of the present invention, the X1 driving device and the X2 driving device have the same structure, and the X1 driving device and the X2 driving device are respectively arranged at the left ends of the X1 support rod and the X2 support rod, The X1 driving device includes a first fine adjustment seat, a first mounting seat, a motor, a screw, and a nut sleeved on the screw. The first fine adjustment seat is connected to the X1 support rod, and the nut is connected to the X1 support rod. The Y1 rod is connected, the output shaft of the motor is connected to the screw, the support unit of the motor and the screw is arranged on the first mounting seat, and the first mounting seat is connected to the first fine adjustment seat Movable connection.

According to some embodiments of the present invention, a sliding rail is provided on the first fine-tuning seat, a sliding block movable along the sliding rail is provided on the sliding rail, and the first mounting seat passes through the sliding block and The first fine adjustment seat is movably connected.

According to some embodiments of the present invention, the Y1 driving device and the Y2 driving device have the same structure, and the Y1 driving device and the Y2 driving device are respectively arranged behind the Y1 support rod and the Y2 support rod. The Y1 driving device includes a second fine adjustment seat, a second mounting seat, a motor, a screw and a guide nut sleeved on the screw, the second fine adjustment seat is sleeved on one end of the Y1 support rod, The screw and the guide nut are arranged in the second fine adjustment seat, the guide nut is provided with a sliding groove, the guide nut can move in the second fine adjustment seat, and the second fine adjustment seat is A fixed cylinder is provided. The end of the piston rod of the fixed cylinder is provided with a guide block matching the sliding groove. The guide block is movably arranged in the sliding groove. The motor and the screw are supported The unit is arranged on the second mounting seat, the output shaft of the motor is connected with the screw drive, the second mounting seat is connected with the second fine-tuning seat, and the second fine-tuning seat is provided with a Y-direction Waist hole, the X1 support rod and the guide nut are connected by screws that pass through the X waist hole and the Y waist hole in sequence.

According to some embodiments of the present invention, the left end of the X1 support rod is provided with an X-direction waist hole, the X1 support rod is connected to the Y1 support rod by a screw passing through the X-direction waist hole, and the Y2 support The right end of the rod is provided with a lock frame cylinder, the right end of the X1 support rod is provided with a U-shaped groove matching the piston rod of the lock frame cylinder, and the piston rod of the lock frame cylinder extends into the U-shaped groove, The end of the piston rod is provided with a fixed disk, the diameter of the fixed disk is larger than the groove width of the U-shaped groove.

According to an embodiment of the second aspect of the present invention, a method for calibrating a silk screen frame is provided, including:

Install the screen printing screen frame to establish the position reference relationship between the screen frame and the platform;

Calibrate several vision sensors, determine the pixel equivalent of the vision sensor, and establish the mapping relationship between the vision sensor and the platform;

Setting a number of target points on the substrate, and setting a number of graphics corresponding to the target points one-to-one on the printed pattern;

The visual positioning mechanism obtains the position information of several target points on the substrate placed on the platform, and records their coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ )... (X _n , Y _n ) respectively;

Pasting a layer of monochromatic film on the substrate, the monochromatic film completely covering the printing surface of the substrate;

Transport the platform under the net frame, print the printed pattern clearly on the monochromatic film, and then transport the platform back to the initial position;

The visual positioning mechanism obtains the position information of several graphics on the monochromatic mold and records its coordinates (X ₁ ', Y ₁ '), (X ₂ ', Y ₂ ')...(X _n ', Y _n '), and _{Calculate the coordinate deviations (△X 1} ,△Y ₁ ), (△X ₂ ,△Y ₂ )......(△X _n ,△Y _n ) of several target points and several graphics corresponding to the target points respectively;

The screen frame adjusts the relative positions of the X1 support rods 520, X2 support rods, Y1 support rods, and Y2 support rods according to the coordinate deviation to complete the calibration of the screen printing screen frame.

The screen printing frame calibration method according to the embodiment of the present invention can be implemented by the screen printing machine of the first aspect of the present invention. The four supporting rods are driven to move relative to each other through four driving devices, and position correction and angle correction are realized at the same time, with accuracy and efficiency. high. At the same time, the calibration pattern is printed on the monochromatic film to avoid scrapping of raw materials during calibration and reduce production loss.

According to some embodiments of the present invention, there are two target points, and the two target points are respectively set at two opposite corners of the substrate, and there are correspondingly two graphics on the printing pattern.

The additional aspects and advantages of the present invention will be partly given in the following description, and partly will become obvious from the following description, or be understood through the practice of the present invention.

Description of the drawings

The present invention will be further described below with reference to the drawings and embodiments;

Figure 1 is a schematic structural diagram of an embodiment of the screen printing machine of the present invention;

2 is a schematic structural diagram of an embodiment of the screen frame in the screen printing machine of the present invention;

Fig. 3 is a schematic diagram of the structure of the X1 support rod of the net frame of Fig. 2;

Fig. 4 is a schematic diagram of the structure of the X2 support rod of the net frame of Fig. 2;

Fig. 5 is a schematic diagram of the structure of the net frame clamping rod of the net frame of Fig. 2;

Fig. 6 is an enlarged schematic diagram of area A in Fig. 2;

Figure 7 is a side view of Figure 6;

Fig. 8 is an enlarged schematic diagram of area B in Fig. 2;

Fig. 9 is a schematic diagram of a specific structure of the X1 driving device in Fig. 2;

Fig. 10 is an enlarged schematic diagram of area C in Fig. 2;

Fig. 11 is a schematic diagram of a specific structure of the Y2 driving device in Fig. 2;

FIG. 12 is a schematic diagram of the structure of the second fine adjustment seat in FIG. 10;

Figure 13 is a schematic diagram of the matching relationship between the fixed cylinder and the guide nut in Figure 11;

Figure 14 is a flow chart of the silk screen frame calibration method of the present invention.

Reference signs:

Against the board mechanism 100,

Platform 200,

Visual positioning mechanism 300,

Printing agency 400,

Net frame 500, X-direction waist hole 501, bearing 502, synchronous wheel set 503, screw 504, washer 505, nut 506, screw 507, motor 508, net frame clamping rod 510, clamping rod body 511, clamping frame backing plate 512, frame cylinder 513, pressure plate 514, frame cylinder 515, frame cylinder seat 516, guide groove 517, X1 support rod 520, U-shaped groove 521, X2 support rod 530, guide plate 531, Y1 support rod 540, Y2 support rod 550, lock frame cylinder 551, fixed plate 552, X1 drive device 560, first fine adjustment seat 561, first mounting seat 562, slide rail 563, slider 564, X2 drive device 570, Y1 drive device 580, The second fine adjustment seat 581, the second mounting seat 582, the fixed cylinder 583, the guide nut 584, the sliding groove 585, the guide block 586, the Y-direction waist hole 587, and the Y2 driving device 590.

Detailed ways

This section will describe the specific embodiments of the present invention in detail. The preferred embodiments of the present invention are shown in the accompanying drawings. The function of the accompanying drawings is to supplement the description of the text part of the manual with graphics, so that people can understand the present invention intuitively and vividly. Each technical feature and overall technical solution of the invention cannot be understood as a limitation on the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation description involved, such as up, down, front, back, left, right, etc. indicates the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, but In order to facilitate the description of the present invention and simplify the description, it does not indicate or imply that the device or element referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

In the description of the present invention, several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to not include the number, and above, below, and within are understood to include the number. If it is described that the first and second are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying the relative importance or implicitly specifying the number of the indicated technical features or implicitly specifying the order of the indicated technical features relationship.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, and connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above terms in the present invention in combination with the specific content of the technical solution.

1, a screen printing machine according to an embodiment of the present invention includes a plate alignment mechanism 100, a platform 200, a visual positioning mechanism 300, a printing mechanism 400, a net frame 500, and a controller. The platform 200 is set on the plate alignment mechanism 100, and the platform 200 is used to place the substrate. The platform 200 can adjust the position of the substrate in the three dimensions of X, Y and angle. The visual positioning mechanism 300 is arranged at one end of the board alignment mechanism 100, and the visual positioning mechanism 300 is used to collect the visual information of the substrate. The printing mechanism 400 is arranged above the plate alignment mechanism 100. The printing mechanism 400 is used to print a printed pattern on the substrate. The printing mechanism 400 includes two brushes and a brush drive mechanism, an ink supply device, and a frame lifting device. The net frame 500 is erected under the printing mechanism 400. The net frame 500 includes a net frame clamping mechanism and a net frame adjustment mechanism. The net frame 500 is arranged on the net frame adjustment mechanism. The net frame adjustment mechanism includes the first and the last movable connection to form a closed rectangle. X1 support rods 520, X2 support rods 530, Y1 support rods 540, and Y2 support rods 550, as well as X1 driving devices 560, X2 driving devices 570, and Y1 driving devices 580 that drive the X1 support rods 520 and X2 support rods 530 to move, respectively And Y2 drive device 590. The controller is used for data processing and silk screen printing machine control. The alignment mechanism 100 is used to transport the platform 200 back and forth under the visual positioning mechanism 300 and the printing mechanism 400. The X1 support rods 520 and X2 support rods 530 can respectively move in the X direction and the Y direction under the drive of four driving devices, and indirectly drive the movement of the screen frame clamping mechanism, and the screen frame can be adjusted in four directions. At the same time, it realizes the screen frame calibration in the XY direction and the angle screen frame calibration, which has high efficiency and high calibration accuracy, and can also reduce the calculation amount of the controller.

In some embodiments of the screen printing machine of the present invention, as shown in FIG. 5, the screen frame clamping mechanism includes two screen frame clamping rods 510 with the same structure. The screen frame clamping rod 510 includes a clamping rod body 511, a clamping frame backing plate 512 arranged at the bottom of the clamping rod body 511, and a frame cylinder 513 arranged on the clamping rod body 511. The top of the piston rod of the frame cylinder 513 is provided with a pressure plate 514. When the piston rod of the frame cylinder 513 extends, the left and right borders of the silk screen frame are clamped between the pressure plate 514 and the clamping frame backing plate 512 to achieve silk screen printing. Installation of the screen frame. Both ends of the clamping rod body 511 are respectively provided with a clamping frame cylinder 515, the clamping frame cylinder 515 is arranged on the clamping rod body 511 through a clamping frame cylinder base 516, and the clamping frame cylinder block 516 is provided with a piston for the clamping frame cylinder 515 The through hole through which the rod extends. The X1 support rod 520 and the X2 support rod 530 are clamped by the clamp frame cylinder block 516 and the clamping rod body 511 at both ends of the screen frame holding rod, as shown in FIG. 7. When the piston rod of the clamp frame cylinder 515 extends, the end of the piston rod presses the X1 support rod 520 or the X2 support rod 530 against the clamping rod body 511. At this time, the screen frame clamping rod 510 and the X1 support rods 520 and X2 The positional relationship between the support rods 530 is fixed.

In some embodiments, referring to FIG. 3, the left end of the X1 support rod 520 is provided with an X waist hole 501, and the X1 support rod 520 is connected to the Y1 support rod 540 by a screw 504 passing through the X waist hole 501. The screw 504 A gasket 505 is cushioned under the head. As shown in FIG. 8, the Y1 support rod 540 and the X1 support rod 520 are movably connected by a screw 504 and an X-direction waist hole 501. 6 shows, the right end of the Y2 support rod 550 is provided with a lock frame cylinder 551, the right end of the X1 support rod 520 is provided with a U-shaped groove 521 matching the piston rod of the lock frame cylinder 551, and the piston rod of the lock frame cylinder 551 extends Into the U-shaped groove 521, the end of the piston rod is provided with a fixed disk 552, the diameter of the fixed disk 552 is larger than the groove width of the U-shaped groove 521. When the piston rod of the lock frame cylinder 551 is retracted into the cylinder, the fixing plate 552 presses the X1 support rod 520 on the Y2 support rod 550. At this time, the relative position between the X1 support rod 520 and the Y2 support rod 550 is fixed; when the lock frame cylinder The piston rod of 551 extends out of the cylinder, the fixed pressure plate 514 is relaxed, and the relative positional relationship between the X1 support rod 520 and the Y1 support rod 540 can be changed under the driving of the four driving devices. 4, X2 support rod 530 and X1 support rod 520 are basically the same in structure, the difference is that both ends of X2 support rod 530 are connected to Y1 support rod 540 and Y2 support rod 550 through X waist holes 501, and X2 support rod 530 One side is also equipped with a guide plate 531. The clamping frame cylinder seat 516 at the rear end of the screen frame clamping rod 510 is provided with a guide groove 517 matching the guide plate 531. As shown in Figure 5, the upper end of the guide plate 531 extends into the guide In the slot 517, it is ensured that the two screen frame clamping rods 510 remain substantially parallel.

In some embodiments, the X1 driving device 560 and the X2 driving device 570 have the same structure, and the X1 driving device 560 and the X2 driving device 570 are respectively arranged at the left end of the X1 support rod 520 and the X2 support rod 530, as shown in FIGS. 8 and 9 As shown, the X1 driving device 560 includes a first fine-tuning seat 561, a first mounting seat 562, a motor 508, a screw 507, and a nut 506 sleeved on the screw 507. The nut 506 is connected to the Y1 rod, and the output shaft of the motor 508 is connected to the The screw 507 is drivingly connected, and the motor 508 and the supporting unit of the screw 507 are arranged on the first mounting seat 562. The motor 508 drives the screw 507 to rotate, and at the same time drives the nut 506 sleeved on the screw 507 to move back and forth along the screw 507 under the drive of the thread, indirectly driving the X1 support rod 520 to move in the X direction relative to the Y1 support rod 540, thereby driving it The frame clamping rod 510 moves. The first mounting seat 562 is movably connected to the first fine-adjusting seat 561, so that when the Y1 support rod 540 and the X1 support rod 520 undergo relative displacement in the Y direction, the screw 507 will not be damaged by force. In some embodiments, as shown in FIG. 9, a sliding rail 563 is provided on the first fine adjustment seat 561, and a slider 564 that can move along the sliding rail 563 is provided on the sliding rail 563. The slider 564 is connected to the first mounting The seat 562 is connected, and the first mounting seat 562 is movably connected to the first fine-adjusting seat 561 through the sliding block 564. It can be understood that other movable connection structures such as pulleys can also be used between the first fine-tuning seat 561 and the first mounting seat 562. The structure and installation method of the X2 driving device 570 are the same as the X1 driving device 560, and will not be repeated here.

In some embodiments, referring to FIGS. 10 to 13, the Y1 driving device 580 and the Y2 driving device 590 have the same structure, and the Y1 driving device 580 and the Y2 driving device 590 are respectively arranged on the Y1 support rod 540 and the Y2 support rod 550. rear end. The Y1 driving device 580 includes a second fine adjustment seat 581, a second mounting seat 582, a motor 508, a screw 507, and a guide nut 584 sleeved on the screw 507. The second fine adjustment seat 581 is sleeved on the left end of the Y1 support rod 540, the screw 507 and the guide nut 584 are arranged in the second fine adjustment seat 581, and the guide nut 584 can move in the second fine adjustment seat 581. The guide nut 584 is provided with a sliding groove 585, the second fine adjustment seat 581 is provided with a fixed cylinder 583, the end of the piston rod of the fixed cylinder 583 is provided with a guide block 586 matching the sliding groove 585, and the guide block 586 is movably arranged in Inside the chute 585. The supporting unit of the motor 508 and the screw 507 is arranged on the second mounting base 582, the output shaft of the motor 508 is in transmission connection with the screw 507, the second mounting base 582 is connected with the second fine adjustment base 581, and the second fine adjustment base 581 is provided with Y The waist hole 587, the X1 support rod 520 and the guide nut 584 are connected by a screw 504 passing through the X waist hole 501 and the Y waist hole 587 in sequence. 11, the motor 508 can drive the screw 507 to rotate, and the guide nut 584 is driven to move along the screw 507 in the second fine adjustment seat 581, and the screw 504 connected with the nut 506 is also driven to move along the Y-direction waist hole 587. The screw 504 At the same time, the X1 support rod 520 is driven to move in the Y direction relative to the Y1 support rod 540 through the X waist hole 501, which indirectly drives the screen frame clamping rod 510 directly connected to the X2 support rod 530 to move, and the X1 support rod 520 also It moves under the drive of the screen frame clamping rod 510. Referring to FIG. 13, when the piston rod of the fixed cylinder 583 contracts, the slider 564 is tightly pressed on the sliding groove 585, and the slider 564 is difficult to move in the sliding groove 585 at this time, X1 support rod 520 and Y1 support rod 540 The positional relationship between them is locked; when the piston rod of the fixed cylinder 583 extends, the slider 564 can normally move along the sliding groove 585 under the movement of the screw 507 to adjust the movement of the X1 support rod 520 relative to the Y1 support rod 540.

The plate alignment mechanism 100, the printing mechanism 400, the visual positioning mechanism 300, and the platform 200 in the screen printing machine of the present invention are existing technologies that are already known or can be known to those skilled in the art, and their specific structures are not described in detail here.

The following describes in detail the net frame 500 on the screen printing machine according to the embodiment of the present invention with a specific embodiment with reference to FIGS. 1 to 12. It should be understood that the following description is only an exemplary description, rather than a specific limitation on the utility model.

3 and 4, X1 support rods 520 and X2 support rods 530 are provided with scales to facilitate the installation of the screen frame 500 according to the width of the screen frame to adjust the distance between the two screen frame clamping rods 510, which is convenient for the installation of the screen frame . Referring to FIG. 5, two frame pressing cylinders 513 are provided on the screen frame clamping rod 510 at intervals. In addition, the screen frame clamping rod 510 is also provided with two manual tightening devices for initial positioning of the screen printing screen frame. The tightening device consists of a screw 504 with a handle and is used to fix the mounting seat of the screw 504. The seat has an internal thread that matches with the screw 504, and the other end of the screw 504 is equipped with a pressure plate 514.

Referring to Figures 8 and 9, the first fine adjustment seat 561 is connected in a threaded manner. The through holes of the X1 support rod 520 and the X2 support rod 530 for connecting the X1 driving device 560 and the X2 driving device 570 are provided with a bearing 502, The first mounting base 562 can rotate within a certain range relative to the X1 support rod 520 or the X2 support rod 530, so that the first fine adjustment base 561 does not interfere with the movement of the X1 support rod 520 and the X 2 support rod. 10-13, the second fine adjustment seat 581 is a hollow rectangular parallelepiped structure with two openings formed by combining four rectangular plates, the Y-direction waist hole 587 is provided on the rectangular plate at the top, the screw 507 and the guide nut 584 is set in a hollow structure. One end of the second fine adjustment seat 581 is connected to the second mounting seat 582, and the other end thereof is connected to the Y1 support plate or the Y2 support rod 550 through two backing plates in a threaded manner. Referring to Figures 8 to 13, in this embodiment, the motor 508 and the screw 507 are connected to each other through a synchronous wheel set 503, which includes synchronous wheels with the same diameter provided on the output shaft of the motor 508 and one end of the screw 507, and A timing belt with two timing wheels connected together.

The silk screen frame calibration method according to the second aspect of the present invention can be implemented by the silk screen printer according to the first aspect of the present invention, which specifically includes the following steps, as shown in FIG. 14.

First install the screen printing screen frame to establish the position reference relationship between the screen frame 500 and the platform 200. The screen printing screen frame 500 is set on the screen frame adjusting mechanism and fixed by the frame pressing cylinder 513. The relative positional relationship between the platform 200 and the net frame 500 is set in the controller, so that the plate alignment mechanism 100 and the platform 200 can move the substrate directly under the net frame 500.

Then calibrate several vision sensors, determine the pixel equivalent of the vision sensor, and establish the mapping relationship between the vision sensor and the platform 200. Determine the equivalent of the vision sensor and determine the mapping relationship between the vision sensor and the platform 200, so that the pixel coordinates collected by the vision sensor can be converted into coordinate values under actual coordinates. In this embodiment, the vision positioning mechanism 300 has two vision sensors, and both of the vision sensors can move within a certain range in the three directions of X, Y, and Z.

Then, a number of target points are set on the substrate, and a number of graphics corresponding to the number of target points are set on the printed pattern. The one-to-one correspondence here is: each target point on the substrate has a graphic with a center of gravity that coincides with the center of gravity of the target point and is correspondingly set on the printed pattern. In an ideal state, when the shape of the target point and the graphic shape are the same, After the printing pattern is printed on the substrate, the frame of the target point coincides with the edge of the graphic. It is understandable that the target point can be a pattern on the substrate or a through hole. The target point and the graphics corresponding to the target point should be similar regular graphics to facilitate the calculation of their center of gravity and improve the accuracy of calibration.

Then obtain the position information of several target points on the substrate placed on the platform 200 through the visual positioning mechanism 300, and respectively record their coordinates (X ₁ , Y ₁ ), (X ₂ , Y ₂ )... (X _n , Y _n ). The coordinates here are the coordinates of the center of gravity of several target points.

After obtaining the coordinate value of the target point, a layer of monochromatic film is attached to the substrate, and the monochromatic film completely covers the printing surface of the substrate. Cover all the visual features on the substrate with a monochromatic film to avoid affecting the visual sensor. At the same time, printing the pattern on the monochromatic film will not pollute the debug version. Repeated calibration can be achieved by replacing the monochromatic film without causing Waste of raw materials.

After the monochromatic film is pasted, the plate alignment mechanism 100 transports the platform 200 under the net frame 500, the printing mechanism 400 clearly prints the printed pattern on the monochromatic film, and the plate alignment mechanism 100 transports the platform 200 back to the initial position. At this time, the graphic corresponding to the target point is printed on the monochromatic film.

After the printing is completed, the visual positioning mechanism 300 obtains the position information of several graphics on the monochromatic mold and records their coordinates (X ₁ ', Y ₁ '), (X ₂ ', Y ₂ ')... (X _n ', Y _n '), and calculate the coordinate deviations (△X ₁ ,△Y ₁ ), (△X ₂ ,△Y ₂ )……(△X _n ,△Y _n ). Since the target point is consistent with the center of gravity of the corresponding graphic, the center of gravity position of the graphic is obtained and the deviation from the coordinate value of the corresponding target point of the graphic is calculated. This deviation is the deviation of the silk screen frame at the target point of the substrate from the ideal position.

After obtaining the deviation value, the net frame 500 adjusts the relative positions of the four X1 support rods 520, X2 support rods 530, Y1 support rods 540, and Y2 support rods 550 according to the coordinate deviations to complete the calibration of the screen printing screen frame. The positional relationship between the four support rods is driven by the four driving devices according to the deviation value to drive the screen frame to swing. One movement can complete the position and angle calibration at the same time, which improves the calibration efficiency and calibration accuracy.

In some embodiments, two target points are set, and they are respectively set near two diagonal corners of the substrate, such as one set at the upper left corner and one set at the lower left corner, and the graphics on the printed pattern are set accordingly. At this time, the coordinate deviation values (△X ₁ ,△Y ₁ ) and (△X ₂ ,△Y ₂ ) can be obtained after the above steps. At this time, the screen frame calibration is completed, and the X1 drive device 560, Y1 drive device 580, X2 drive device 570 and Y2 drive device 590 in the screen frame adjustment mechanism act respectively △X ₁ , △Y ₁ , △X ₂ and △Y ₂ Distance, you can complete the calibration of the screen printing screen frame and the calculation amount of the controller. In this embodiment, the X1 drive device 560 and the Y1 drive device 580 perform linear interpolation when they are moving, and the X2 drive device 570 and the Y2 drive device 590 perform linear interpolation to improve the calibration accuracy.

According to the screen printing machine of the embodiment of the first aspect of the present invention, the semi-automatic calibration function of the screen printing frame can be realized. And because the four support rods of the screen frame adjustment mechanism are movably connected, the positions of the X1 support rods and the X2 support rods can be driven by the four driving devices to achieve the effects of angle straightening and position correction at the same time, compared to the traditional first adjustment position Deviation, the method of adjusting the angle deviation, the two adjustments affect each other, which can improve the calibration efficiency and accuracy.

The screen frame calibration method according to the embodiment of the second aspect of the present invention can be implemented by the screen printer according to the embodiment of the first aspect of the present invention. While improving the calibration efficiency and accuracy, the screen printing pattern during the calibration process is printed in a single color. The film will not create an impression on the product and can reduce the waste of raw materials.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" etc. means to incorporate the implementation The specific features, structures, materials or characteristics described in the examples or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and within the scope of knowledge possessed by a person of ordinary skill in the technical field, it is possible to make various changes without departing from the purpose of the present invention. Kind of change.

Claims

A screen printing machine, characterized in that it comprises:

Counter board mechanism (100);

The platform (200) is set on the plate matching mechanism (100) and is used to place the substrate;

The visual positioning mechanism (300) is arranged at one end of the plate matching mechanism (100) and is used to collect the visual information of the substrate;

The printing mechanism (400) is arranged on the plate matching mechanism (100), and is used to print a printing pattern on the substrate;

The screen frame (500) includes a screen frame clamping mechanism and a screen frame adjustment mechanism, the screen frame clamping mechanism is arranged on the screen frame adjustment mechanism, and the screen frame adjustment mechanism is connected to the printing mechanism (400) The screen frame adjustment mechanism includes X1 support rods (520), X2 support rods (530), Y1 support rods (540), and Y2 support rods (550) that are movably connected end to end to form a closed rectangle. The mechanism also includes an X1 drive device 560, an X2 drive device 570, a Y1 drive device (580), and a Y2 drive device (590) that drive the X1 support rod 520 and the X2 support rod 530 to move respectively;

Controller, used for data processing and screen printing machine control;

The platform (200) can move back and forth on the board alignment mechanism (100) under the visual positioning mechanism (300) and the printing mechanism (400).
The screen printing machine according to claim 1, wherein the screen frame clamping mechanism includes two screen frame clamping rods (510) with the same structure, and the screen frame clamping rods (510) include a clamping rod body. (511). A clamping frame backing plate (512) arranged at the bottom of the clamping rod body (511) and a frame pressing cylinder (513) arranged on the clamping rod body (511), the pressing frame cylinder (513) ) Is provided with a pressure plate (514) at the top end of the piston rod, the left and right frames of the silk screen frame are clamped between the pressure plate (514) and the clamping frame backing plate (512), and the clamping rod body (511) ) Are respectively provided with a clamping frame cylinder (515), the clamping frame cylinder (515) is arranged on the clamping rod body (511) through a clamping frame cylinder seat (516), the clamping frame cylinder seat (516) ) Is provided with a through hole for the piston rod of the clamping frame cylinder (515) to extend, and the X1 support rod (520) and the X2 support rod (530) are respectively clamped on the clamping rod body (511). ) And the clamp frame cylinder seat (516).
The screen printing machine according to claim 2, wherein both ends of the X2 support rod (530) are provided with X-direction waist holes (501), and the X2 support rod (530) is respectively connected to the Y1 support rod. (540) and the Y2 support rod (550) are connected by a screw (504) passing through the X waist hole (501).
The screen printing machine according to claim 3, wherein a guide plate (531) is provided on one side of the X2 support rod (530) for clamping the clamping frame of the X2 support rod (530) A guide groove (517) is provided on the cylinder base (516), and the guide plate (531) is penetrated in the guide groove (517).
The screen printing machine according to claim 3, wherein the X1 driving device (560) and the X2 driving device (570) have the same structure, and the X1 driving device (560) and the X2 driving device (570) ) Are respectively arranged at the left ends of the X1 support rod (520) and the X2 support rod (530), and the X1 driving device (560) includes a first fine adjustment seat (561), a first mounting seat (562), and a motor (508), a screw (507) and a nut (506) sleeved on the screw (507), the first fine adjustment seat (561) is connected to the X1 support rod (520), and the nut (506) ) Is connected to the Y1 rod, the output shaft of the motor (508) is in transmission connection with the screw (507), and the motor (508) and the supporting unit of the screw (507) are arranged in the first installation On the seat (562), the first mounting seat (562) is movably connected with the first fine adjustment seat (561).
The screen printing machine according to claim 5, characterized in that a sliding rail (563) is provided on the first fine adjustment seat (561), and the sliding rail (563) is provided with a sliding rail (563). ) A movable sliding block (564), the first mounting seat (562) is movably connected with the first fine-adjusting seat (561) through the sliding block (564).
The screen printing machine according to claim 3, wherein the Y1 driving device (580) and the Y2 driving device (590) have the same structure, and the Y1 driving device (580) and the Y2 driving device ( 590) are respectively arranged at the rear end of the Y1 support rod (540) and the Y2 support rod (550), the Y1 driving device (580) includes a second fine adjustment seat (581), a second mounting seat (582) , A motor (508), a screw (507) and a guide nut (584) sleeved on the screw (507), the second fine adjustment seat (581) sleeved on one end of the Y1 support rod (540) , The screw (507) and the guide nut (584) are arranged in the second fine adjustment seat (581), the guide nut (584) is provided with a sliding groove (585), the guide nut (584) ) Can move in the second fine-tuning seat (581), the second fine-tuning seat (581) is provided with a fixed cylinder (583), and the end of the piston rod of the fixed cylinder (583) is provided with the A guide block (586) matching the sliding groove (585), the guide block (586) is movably arranged in the sliding groove (585), the motor (508) and the supporting unit of the screw (507) Is arranged on the second mounting seat (582), the output shaft of the motor (508) is drivingly connected with the screw (507), and the second mounting seat (582) is connected to the second fine adjustment seat (581). ) Connection, the second fine adjustment seat (581) is provided with a Y-direction waist hole (587), the X1 support rod (520) and the guide nut (584) pass through the X-direction waist hole ( 501) is connected with the screw (504) of the Y-direction waist hole (587).
The screen printing machine according to claim 1, wherein the left end of the X1 support rod (520) is provided with an X waist hole (501), and the X1 support rod (520) passes through the X waist The screw (504) of the hole (501) is connected to the Y1 support rod (540), the right end of the Y2 support rod (550) is provided with a lock frame cylinder (551), and the right end of the X1 support rod (520) is provided There is a U-shaped groove (521) matching the piston rod of the lock frame cylinder (551), the piston rod of the lock frame cylinder (551) extends into the U-shaped groove (521), and the piston rod A fixed disk (552) is provided at the end, and the diameter of the fixed disk (552) is larger than the groove width of the U-shaped groove (521).
A method for calibrating a silk screen screen frame, which is characterized in that it comprises:

Install the screen printing screen frame to establish the position reference relationship between the screen frame and the platform;

Calibrate several vision sensors, determine the pixel equivalent of the vision sensor, and establish the mapping relationship between the vision sensor and the platform;

Setting a number of target points on the substrate, and setting a number of graphics corresponding to the target points one-to-one on the printed pattern;

The visual positioning mechanism obtains the position information of several target points on the substrate placed on the platform, and records their coordinates (X 1 , Y 1 ), (X 2 , Y 2 )... (X n , Y n ) respectively;

Pasting a layer of monochromatic film on the substrate, the monochromatic film completely covering the printing surface of the substrate;

Transport the platform under the net frame, print the printed pattern clearly on the monochromatic film, and then transport the platform back to the initial position;

The visual positioning mechanism obtains the position information of several graphics on the monochromatic mold and records its coordinates (X 1 ', Y 1 '), (X 2 ', Y 2 ')...(X n ', Y n '), and Calculate the coordinate deviations (△X 1 ,△Y 1 ), (△X 2 ,△Y 2 )......(△X n ,△Y n ) of several target points and several graphics corresponding to the target points respectively;

The net frame adjusts the relative positions of the X1 support rod, X2 support rod, Y1 support rod and Y2 support rod according to the coordinate deviation to complete the calibration of the screen printing screen frame.
The silk screen frame calibration method according to claim 9, characterized in that there are two target points, and the two target points are respectively set at two opposite corners of the substrate, and the graphics on the printed pattern There are two accordingly.