CN112373178A

CN112373178A - Screen printing machine

Info

Publication number: CN112373178A
Application number: CN202011257104.2A
Authority: CN
Inventors: 彭成湘
Original assignee: Hunan Shunming Technology Co ltd
Current assignee: Hunan Shunming Technology Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-02-19

Abstract

A screen printing machine comprises a printing frame body, a universal chassis adjusting device, a printing pad and a printing device; the printing machine frame body is used for supporting the printing platform and the printing device; the universal chassis adjusting device is arranged in the printing machine frame body and is used for adjusting the printing device; the printing device comprises a frame body, a printing device, a printing pad, a bearing table and a control device, wherein the bearing table is arranged between the frame body and the printing device and used for supporting and fixing a printing stock, and one surface of the bearing table, which is in contact with the printing stock, is an object carrying surface; the printing machine further comprises a machine vision system, wherein the machine vision system is arranged on the printing machine frame body, penetrates through the printing pad and is used for judging the relative position information of the reference mark; and establishing a reference mapping relation among the machine vision system, the printing stock, the universal chassis adjusting device and the printing device through the machine vision system, realizing accurate repeated positioning and repeated printing, and filling gaps of the inner electrode patterns.

Description

Screen printing machine

Technical Field

The invention relates to the field of screen printers, in particular to a screen printer.

Background

A chip multilayer ceramic capacitor (MLCC) is a multilayer ceramic capacitor composed of alternating layers of ceramic dielectrics and metal internal electrodes. The inductor has a structure of overlapping multiple layers of media, so that the inductor is very low at high frequency and has very low equivalent series resistance; no polarity; the circuit is used in a low-impedance circuit and does not need to be derated greatly; the explosion is not generated during breakdown, and the safety is high. Due to the advantages, when the power supply is applied to various circuits, the power supply can reduce energy loss and ripple voltage and improve conversion frequency, and has important significance for portable products.

Along with the miniaturization of MLCCs, high requirements are put on the capacity of capacitors, and the capacity of elements is increased while the sizes of the elements are made smaller, which means that the number of stacked electrode bars is increased while the printed inner electrode patterns are smaller.

However, in the lamination process, since the printed internal electrode patterns have a constant thickness and a constant interval between the internal electrode patterns, a gap of a constant width is formed between the printed internal electrode patterns, and thus, a constant gap is formed between the internal electrode patterns of the electrode bar block. As the number of laminations increases, the voids also increase. When the electrode bar block is used for manufacturing high-pressure lamination of a capacitor chip, the inner electrode pattern is deformed due to gaps in the electrode bar block, and the larger the lamination number is, the larger the deformation is, the flatness, continuity, shape structure and the like of the inner electrode pattern are directly influenced, and finally the capacitance, reliability and electrical performance of the MLCC product are influenced.

Disclosure of Invention

In view of this, it is necessary to provide a screen printer for solving the problem that there is a gap between the inner electrode patterns when laminating.

A screen printing machine comprises a printing frame body, a universal chassis adjusting device, a printing pad and a printing device; the printing machine frame body is used for supporting the printing platform and the printing device; the universal chassis adjusting device is arranged in the printing machine frame body and is used for adjusting the printing device; the printing device comprises a frame body, a printing device, a printing pad, a bearing table and a control device, wherein the bearing table is arranged between the frame body and the printing device and used for supporting and fixing a printing stock, and one surface of the bearing table, which is in contact with the printing stock, is an object carrying surface; the printing machine frame further comprises a machine vision system, wherein the machine vision system is arranged on the printing machine frame body, penetrates through the printing platform and is used for judging the relative position information of the reference mark.

In one embodiment, the machine vision system is removably disposed to the printer frame body.

In one embodiment, the machine vision system includes an image capturing device and a control system, wherein the image capturing device is disposed through the printing pad and below the object carrying surface.

In one embodiment, the image capture device is an industrial camera.

In one embodiment, the printing device comprises a printing frame mechanism and a printing mechanism, wherein the printing frame mechanism comprises a printing frame lifting cylinder, a mesh gap adjusting device, a screen frame, a screen printing adjusting knob and a screen locking mechanism, and the printing frame lifting cylinder is used for realizing the lifting and the descending of the printing frame mechanism; the mesh gap adjusting device is arranged above the universal chassis adjusting device and is used for adjusting the distance between a silk screen and a printing stock; the screen printing adjusting knob is screwed on the screen frame and used for adjusting the tightness of the screen; the printing mechanism comprises a slurry spreading knife, a scraper and a guide rail, wherein the slurry spreading knife and the scraper move along the guide rail to realize printing.

In one embodiment, the mesh gap adjusting device comprises an adjusting motor, a transmission belt, a worm gear and a printing frame supporting column, wherein the adjusting motor drives the transmission belt and the worm gear to move, and the stretching amount of the printing frame supporting column is adjusted.

In one embodiment, the printing mechanism further comprises a power device, the power device comprises a servo motor, a slurry spreading knife driving cylinder and a scraper driving cylinder, the servo motor is arranged on the printing frame mechanism, the slurry spreading knife driving cylinder is arranged on the slurry spreading knife, and the scraper driving cylinder is arranged on the scraper.

In one embodiment, the printing machine further comprises an automatic printing stock carrier feeding device, an automatic image detection device and a drying device, wherein the automatic printing stock carrier feeding device is used for automatically feeding the printing stock into the printing pad, and the printing device performs printing; the automatic image detection device is used for detecting the quality of a printing stock; the drying device is used for drying the inner electrode pattern.

In one embodiment, the automatic image inspection apparatus includes a pre-printing surface defect inspection apparatus and a post-printing print quality inspection apparatus.

In one embodiment, the printing machine further comprises an automatic winding and unwinding mechanism, a static eliminating device and a tension control device, wherein the automatic winding and unwinding mechanism is used for winding and unwinding a printing stock, and the static eliminating device comprises a static eliminating device before printing and a static eliminating device after printing and is used for eliminating static; the tension control device comprises a tension control device before printing and a tension control device after printing, is used for controlling the tension of a printing stock, and is beneficial to flattening winding and unwinding.

In the screen printing machine, the printing pad supports and fixes the printing stock, the printing device prints the inner electrode pattern on the printing stock, and the relative position information of the reference mark of the printing stock and the reference mark of the printing device is acquired through the machine vision system; then, replacing the silk screen, distinguishing relative position information by using the machine vision system, and establishing a reference mapping relation among the machine vision system, the printing stock, the universal chassis adjusting device and the printing device: if the relative position is the same as that when the inner electrode pattern is printed, directly carrying out repeated printing; if the relative position of the printed material and the relative position of the reference mark of the printing device are deviated from the relative position when the inner electrode pattern is printed, the universal chassis adjusting device is used for adjusting the printing device, so that the relative positions of the reference mark of the printed material and the reference mark of the printing device when the inner electrode pattern is printed are the same as the relative positions when the inner electrode pattern is printed when the printing is repeated; through repeated positioning of the machine vision system, the printing device repeatedly prints the inner electrode patterns, gaps among the inner electrode patterns are filled, gaps among the inner electrode patterns are eliminated when the electrode bar blocks are manufactured, and the electrode bar blocks with high flatness are obtained.

Drawings

FIG. 1 is a schematic view of a screen printing machine;

FIG. 2 is a schematic view of another perspective of the screen printing machine;

fig. 3 is a schematic diagram of the operation of the screen printer.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

Referring to fig. 1 and 2, a screen printing machine 100 includes a printing frame body 110, a universal chassis adjusting device 120, a printing pad 130 and a printing device 140; the printing frame body 110 is used for supporting the printing pad 130 and the printing device 140; the universal chassis adjusting device 120 is disposed in the printing frame body 110, and is configured to adjust the printing device 140; the pad 130 is disposed between the frame body 110 and the printing device 140, and is used for supporting and fixing a printing stock, and a carrying surface 132 is a surface of the pad 130 contacting the printing stock; the printing machine further comprises a machine vision system 150, wherein the machine vision system 150 is arranged on the printing machine frame body 110, penetrates through the printing pad 130 and is used for judging the relative position information of the reference mark.

In the screen printing machine 100, the printing pad 130 supports and fixes the printing object, the printing device 140 prints the inner electrode pattern on the printing object, and the machine vision system 150 acquires the relative position information of the reference mark of the printing object and the reference mark of the printing device 140; then, the screen is replaced, the relative position information is discriminated by the machine vision system 150, and a reference mapping relationship among the machine vision system 150, the printing material, the universal chassis adjustment device 120, and the printing device 140 is established: if the relative position is the same as that when the inner electrode pattern is printed, directly carrying out repeated printing; if the relative position deviates from the relative position when the inner electrode patterns are printed, the universal chassis adjusting device 120 is used for adjusting the printing device 140, so that the relative positions of the reference mark of the printing stock and the reference mark of the printing device 140 when the printing is repeated are the same as the relative positions when the inner electrode patterns are printed; by repeatedly positioning the machine vision system 150, the printing device 140 repeatedly prints the inner electrode patterns, fills gaps between the inner electrode patterns, eliminates gaps between the inner electrode patterns when the electrode bar block is manufactured, and obtains the electrode bar block with high flatness.

In this embodiment, the inner electrode pattern is printed on a substrate, and the substrate is a film carrier. The ink pad 130 is provided with a plurality of air suction holes, and the ink pad 130 is connected with an air suction source to realize the adsorption and positioning of the film carrier. The air suction holes and the air suction source are arranged, so that the film carrier is more stably adsorbed on the printing pad 130 and does not move along with the movement of the scraper in the printing process, and the position is ensured not to change.

In this embodiment, the machine vision system 150 is detachably disposed on the printing machine frame 110, so that when the machine vision system 150 fails, the machine vision system 150 can be detached independently, and the repairing and the installation are convenient and flexible. For example, may be fastened to the printer housing body 110 by means of screws. It should be noted that such an arrangement is only convenient for repair and installation, and is not necessary for repeated positioning and repeated printing.

In this embodiment, the machine vision system 150 includes an image capturing device and a control system, the image capturing device is disposed through the printing pad 130 and below the object carrying surface 132. During the printing process, the image capturing device is used for acquiring the relative position information of the reference mark of the printing stock and the reference mark of the printing device 140. In this embodiment, the reference mark of the printing device 140 is located on the screen frame 1426, and the reference mark of the object is located on the object. After the inner electrode patterns are printed, the image capturing device and the control system penetrating the printing pad 130 record the relative position information. In this embodiment, since the object is attached to the pad 130, the image capturing device is disposed below the object carrying surface 132, and can capture the relative position information between the reference mark of the object and the reference mark of the screen frame 1426 through the object during printing. Of course, in other embodiments, the image capturing device may be flush with the object carrying surface 132 or flush with the opposite surface of the object carrying surface 132, so as to collect the position information. Therefore, it is not necessary that the image capturing device is located below the object carrying surface 132.

In this embodiment, the image capturing device is an industrial camera. The industrial camera has high image stability, high transmission capability and high anti-interference capability, the spectral range of the industrial camera is wide, the industrial camera is suitable for high-quality image processing algorithms, the performance of the industrial camera is stable, reliable and easy to install, the camera is compact, firm and not easy to damage, the continuous working time is long, and the industrial camera can be used in poor environments. The industrial camera is adopted in the embodiment, so that the accuracy of information acquisition is improved. Of course, other image capturing devices having the same features may be used.

Referring to fig. 1, 2 and 3, in the present embodiment, the printing device 140 includes a printing frame mechanism 142 and a printing mechanism 144, and the printing frame mechanism 142 includes a printing frame lifting cylinder 1422, a mesh gap adjusting device 1424, a screen frame 1426, a screen printing adjusting knob 1427 and a screen locking mechanism 1428; the print frame lift cylinder 1422 is used to effect the raising and lowering of the print frame mechanism 142. In this embodiment, after the inner electrode pattern is printed, the screen frame 1426 is separated from the printing material by the printing frame lifting cylinder 1422 in a horizontal lifting manner: when the printing frame mechanism 142 descends, the screen screwed on the screen frame 1426 through the screen printing adjusting knob 1427 is replaced, the screen complementary to the inner electrode pattern is replaced, the printing frame mechanism 142 is lifted through the printing frame lifting cylinder 1422 for repeated printing, and the gap of the inner electrode pattern is filled with an insulating medium; alternatively, the printed film carrier is removed after the repeated printing is completed. In other embodiments, the screen frame 1426 may be separated from the substrate in a lift-off or mobile manner to remove film carriers or replace screens.

In this embodiment, the mesh gap adjusting device 1424 is disposed above the universal chassis adjusting device 120, and is used for adjusting the distance between the screen and the printing material, and includes an adjusting motor 14242, a driving belt 14244, a worm gear 14246, and a printing frame support column 14248. The adjusting motor 14242 drives the driving belt 14244 and the worm gear 14246 to move, so that the distance between the silk screen and the printing stock is controlled by adjusting the stretching amount of the printing frame supporting column 14248. The worm gear 14246 is used to achieve stepless adjustment of the screen to substrate distance. The screen printing adjusting knob 1427 is screwed to the screen printing frame 1426 and is used for adjusting the tightness of the screen printing; when the screen printing adjusting knob 1427 is screwed, the screen locking device 1428 locks to prevent the screen from moving at will, so that the pattern printing is more accurate.

In this embodiment, the printing mechanism 144 includes a spreader blade 1440, a blade 1442, and a guide 1444, and the spreader blade 1440 and the blade 1442 move along the guide 1444 to perform printing. In motion, the scraper 1442 presses the inner electrode paste and the screen spread by the spreading blade 1440, and due to the tension of the screen, the scraper 1442 is resilient, so that the scraper 1442 and the screen always keep line contact to prevent smearing of the print. In this embodiment, the printing mechanism 144 further includes a power device 1446, the power device 1446 includes a servo motor 14462, a blade driving cylinder 14464, and a blade driving cylinder 14466, the servo motor 14462 is disposed on the printing frame mechanism 142, the blade driving cylinder 14464 is disposed on the blade 1440, and the blade driving cylinder 14466 is disposed on the blade 1442. The power device 1446 provides power for the printing mechanism 144, so that the screen printing machine is automated, and the printing efficiency is improved. Of course, this can also be done semi-automatically or manually, which does not affect the repositioning and reprinting.

Referring to fig. 3, in the present embodiment, the printing process is realized in a full-automatic manner. A screen printer 200 further comprises an automatic winding and unwinding mechanism 210, an electrostatic eliminating device 220, a tension control device 230, an automatic printing stock carrier feeding device 240, an automatic image detection device 250 and a drying device 260. The automatic winding and unwinding mechanism 210 realizes automatic winding and unwinding through the rotation of the arranged roller 212. When the winding and unwinding are carried out automatically, the static electricity eliminating devices 220 are respectively arranged, static electricity generated during winding and unwinding is eliminated, and the quality and production safety of printed patterns are guaranteed. After eliminating static electricity, because the outer diameter of the paper roll is changed continuously, and the paper roll is out of round, the gravity center of the paper roll is not superposed with the shaft of the roller, or the paper roll is replaced, the working speed of the machine is changed, and the like, and the tension is changed, so that the tension control device 230 is arranged, and the tension is kept constant in the printing process. The tension control devices 230 are respectively arranged before winding and after unwinding to eliminate static electricity, so that the tension is constant. The automatic printed material carrier feeding device 240 is used for automatically feeding the printed material into the printing pad 130, the printing device 140 performs printing, and a power device is correspondingly arranged to provide power for the automatic printed material carrier feeding device, so that full-automatic printing is realized. The automatic image detection device 250 is used for detecting the quality of printing stocks and comprises a printing front surface defect detection device 252 and a printing quality detection device 254 after printing. Before printing, the surface defect detecting device 252 detects whether the surface of the printing material has a defect. After printing, the surface defect detecting device 254 detects whether the quality of the printed internal electrode pattern meets the requirements. After passing the print quality inspection, a drying device 260 is provided, and the drying device 260 is used for drying the inner electrode pattern.

It should be pointed out that, the full-automatic printing mode adopted in this embodiment is only one mode of realizing printing, and such a mode is favorable to improving printing efficiency, is fit for the continuous printing of great batch, and can guarantee the stability of printed matter quality. In other embodiments, other printing methods, such as manual printing or semi-automatic printing, may be used, as long as repositioning and reprinting is achieved.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A screen printing machine is characterized by comprising a printing machine frame body, a universal chassis adjusting device, a printing pad and a printing device; the printing machine frame body is used for supporting the printing platform and the printing device; the universal chassis adjusting device is arranged in the printing machine frame body and is used for adjusting the printing device; the printing device comprises a frame body, a printing device, a printing pad, a bearing table and a control device, wherein the bearing table is arranged between the frame body and the printing device and used for supporting and fixing a printing stock, and one surface of the bearing table, which is in contact with the printing stock, is an object carrying surface; the printing machine frame further comprises a machine vision system, wherein the machine vision system is arranged on the printing machine frame body, penetrates through the printing platform and is used for judging the relative position information of the reference mark.

2. The screen printing machine of claim 1, wherein the machine vision system is removably provided to the printing frame body.

3. The screen printing machine of claim 2, wherein the machine vision system includes an image capture device and a control system, the image capture device being disposed through the printing pad and below the carrier surface.

4. The screen printing machine according to claim 3, wherein the image capture device is an industrial camera.

5. The screen printing machine of claim 4, wherein the printing device comprises a printing frame mechanism and a printing mechanism, the printing frame mechanism comprises a printing frame lifting cylinder, a screen gap adjustment device, a screen frame, a screen printing adjustment knob and a screen locking mechanism, the printing frame lifting cylinder is used for realizing the lifting and the lowering of the printing frame mechanism; the mesh gap adjusting device is arranged above the universal chassis adjusting device and is used for adjusting the distance between a silk screen and a printing stock; the screen printing adjusting knob is screwed on the screen frame and used for adjusting the tightness of the screen; the printing mechanism comprises a slurry spreading knife, a scraper and a guide rail, wherein the slurry spreading knife and the scraper move along the guide rail to realize printing.

6. The screen printing machine of claim 5, wherein the mesh gap adjustment device includes an adjustment motor, a drive belt, a worm gear and a print frame support post, the adjustment motor moving the drive belt and the worm gear to adjust the amount of extension and retraction of the print frame support post.

7. The screen printing machine according to claim 5, wherein the printing mechanism further includes a power device, the power device includes a servo motor, a spreader blade driving cylinder, and a scraper driving cylinder, the servo motor is provided to the printing frame mechanism, the spreader blade driving cylinder is provided to the spreader blade, and the scraper driving cylinder is provided to the scraper.

8. The screen printing machine according to any of claims 1 to 7, further comprising an object carrier automatic feed device for automatically feeding the object into the pad, an automatic image detection device and a drying device, the printing device performing printing; the automatic image detection device is used for detecting the quality of a printing stock; the drying device is used for drying the inner electrode pattern.

9. The screen printing machine according to claim 8, wherein the automatic image detection device includes a pre-printing surface defect detection device and a post-printing print quality detection device.

10. The screen printing machine according to claim 9, further comprising an automatic winding and unwinding mechanism for winding and unwinding a printing material, a static elimination device including a pre-printing and post-printing static elimination device for eliminating static electricity, and a tension control device; the tension control device comprises a tension control device before printing and a tension control device after printing, is used for controlling the tension of a printing stock, and is beneficial to flattening winding and unwinding.