A screen printing system

Abstract

The present invention relates to the field of printing technology, specifically to a screen printing system, including a base frame and a printing support frame, wherein the printing support frame is movably mounted at the upper end of the base frame, and the left outer surface of the printing support frame is connected to the left outer surface of the base frame by a hinge, a storage table is fixedly mounted on the upper outer surface of the base frame, a printing screen is embedded at the bottom of the inner surface of the printing support frame, a driving mechanism is movably mounted on the upper end of the printing support frame, and the purpose of setting the driving mechanism is to uniformly discharge ink and print, and improve work efficiency, and the driving mechanism includes a circular frame, a roller, a gear, a scraper and a push rod, and the circular frame is movably mounted at the position of the printing support frame. The present invention can realize automatic and uniform ink spraying, reduce the process of manual ink squeezing and ink waste, ensure regular cleaning of the scraper, reduce the situation of uneven smearing caused by the bottom of the scraper agglomerating, and improve printing quality and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to a screen printing system. Background Art

[0002] Screen printing refers to using a silk screen as a base and making a screen printing plate with images through a photosensitive platemaking method. Screen printing consists of five major elements: screen printing plate, scraper, ink, printing table and substrate. Printing is based on the basic principle that the mesh holes of the image part of the screen printing plate can pass the ink, while the mesh holes of the non-image part cannot pass the ink. When printing, pour ink on one end of the screen printing plate, use a scraper to apply a certain pressure to the ink part on the screen printing plate, and move at a constant speed toward the other end of the screen printing plate. During the movement, the ink is squeezed from the mesh holes of the image part to the substrate by the scraper.

[0003] Small manual screen printing machines usually need to be pushed by both hands for printing. During the printing process, ink needs to be squeezed and added to the surface of the printing screen intermittently. During the manual addition process, the amount of ink squeezed out is more or less, and the ink will accumulate in one place. When the scraper is scraped, it will cause uneven printing. In addition, after the scraper has been used many times, the ink stains left on the scraper will lose moisture in the external environment and nodules will adhere. If they are not cleaned in time, it will affect the printing quality of subsequent inks.

[0004] To this end, a screen printing system is proposed. Summary of the invention

[0005] The object of the present invention is to provide a screen printing system which can realize automatic and uniform ink spraying in an appropriate amount, reduce the manual ink squeezing process and ink waste, ensure regular cleaning of the scraper, reduce the uneven coating caused by agglomeration at the bottom of the scraper, improve printing quality and efficiency, and solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a screen printing system, comprising a base frame and a printing support frame, wherein the printing support frame is movably installed at the upper end of the base frame, and the left outer surface of the printing support frame is connected to the left outer surface of the base frame by a hinge, a storage table is fixedly installed on the upper outer surface of the base frame, a printing screen is embedded in the bottom position of the inner surface of the printing support frame, and a driving mechanism is movably installed on the upper end of the printing support frame, and the purpose of setting the driving mechanism is to uniformly discharge ink and print, thereby improving work efficiency.

[0007] Preferably, the driving mechanism includes a circular frame, a roller, a gear, a scraper and a push rod, the circular frame is movably installed at the position of the printing support frame, and the front end outer surfaces of the two are also connected by a hinge, the rear end of the circular frame extends to 3 cm to 5 cm from the rear end of the printing support frame, and the left and right sides of the inner surface of the circular frame are provided with a slide groove 1, the roller is placed horizontally at the front end position inside the circular frame, the number of the gears is two groups, the two groups of gears are rotatably connected to the left and right sides of the roller respectively, and the gears are also slidably connected inside the slide groove 1, an extrusion assembly is installed between the left and right groups of gears through a one-way bearing, and the extrusion assembly passes through the inside of the roller near the upper end, an inkjet assembly is arranged near the lower end of the roller, the scraper is fixedly installed at the lower end of the roller, and the scraper is communicated with the inkjet assembly, the push rod is fixedly installed at the middle position of the front end outer surface of the roller, and the push rod passes through the front end outer surface of the circular frame.

[0008] Preferably, a slide groove 2 is provided on the inner surface of the slide groove 1 near the bottom front end, and the length of the slide groove 2 is one quarter of the length of the slide groove 1. Tooth blocks are fixedly installed at equal distances inside the slide groove 2, and the outer surface of the upper end of the tooth block is in the same plane as the inner surface of the slide groove 1.

[0009] Preferably, the extrusion assembly is opposite to the inkjet assembly in upper and lower positions, and the extrusion assembly includes a cylinder, a metal plate, a counterweight ball and a traction rope. The outer surface of the upper end of the cylinder is provided with an arc-shaped notch, and the inner surface of the cylinder is provided with arc-shaped grooves on the left and right sides near the upper end. The metal plate is made of high-toughness metal and has a bending notch at the middle upper end. Rolling balls are fixedly installed on the left and right sides of the metal plate, and the rolling balls are slidably connected to the lower end of the arc-shaped groove. The counterweight ball is fixedly installed in the middle position of the outer surface of the lower end of the metal plate, and a traction rope is fixedly connected between the counterweight ball and the inner surface of the cylinder.

[0010] Preferably, the inkjet assembly includes a pressure plate, a rubber bag and a discharge pipe, the rubber bag is fixedly installed at the middle position of the lower end of the inner surface of the roller, and the pressure plate is fixedly installed at the upper end of the rubber bag, the discharge pipe is fixedly installed at an equal distance on the outer surface of the lower end of the rubber bag, and the discharge pipe extends to the inside of the scraper, the lower end of the discharge pipe has an oblique structure design, and the pipe mouth is connected to the outside, the length of the scraper is the same as the width of the printing screen, and the left and right sides of the scraper are fixedly installed with pressure blocks.

[0011] Preferably, a slide groove three is provided on the left and right sides of the inner surface of the printing support frame, and a stop block is slidably connected to the front end position inside the slide groove three, a spring group is fixedly connected between the stop block and the slide groove three, a groove is provided on the inner surface of the printing support frame near the rear end of the printing screen, and a cleaning component is movably installed at equal distances inside the groove.

[0012] Preferably, the cleaning assembly includes a triangular block and a hinged ball, the hinged ball is fixedly mounted on the outer surface of the lower end of the triangular block, and the lower end of the hinged ball is hinged to the bottom of the groove, the upper end of the triangular block penetrates and extends to 2 cm to 3 cm from the upper end of the groove, and the outer surfaces of the front and rear ends of the triangular block are both provided with rough surfaces.

[0013] Preferably, an elastic band is fixedly connected between two adjacent triangular blocks near the lower ends, and the two triangular blocks near the left and right sides are also fixedly connected to the inner wall of the groove through the elastic band.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By setting a limiting mechanism, printing can be carried out with just one hand pushing. During the printing process, the extrusion component can be assisted to flip, so as to squeeze the inkjet component to achieve automatic and uniform inkjet, thereby improving work efficiency;

[0016] 2. By setting a cleaning component inside the printing support frame, the scraper is pushed backward by the push rod, and the scraper passes through the upper end of the printing screen in turn until the scraper passes through the area of ​​the printing screen and can be introduced into the upper end of the groove. The scraper and the triangular block touch each other, and the outer surface of the rear end of the scraper and the rough surface of the front end of the triangular block rub against each other, so that the ink stains remaining in the scraping area of ​​the scraper can be scraped off, thereby improving the cleanliness of the bottom of the scraper and improving the printing effect and printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a left sectional view of the present invention;

[0019] Figure 3 It is a cross-sectional view of the combination of the roller and the gear of the present invention;

[0020] Figure 4 It is a left side cross-sectional view of the drum and its internal mechanism of the present invention;

[0021] Figure 5 is a cross-sectional view of an extrusion assembly of the present invention;

[0022] Figure 6 A top cross-sectional view of the printing support frame of the present invention;

[0023] Figure 7 For the present invention Figure 2 A is an enlarged view of the middle image.

[0024] In the figure: 1. base frame; 11. storage table; 2. printing support frame; 21. printing screen; 3. driving mechanism; 31. circular frame; 311. slideway one; 312. slideway two; 313. tooth block; 32. roller; 33. gear; 34. scraper; 35. push rod; 4. extrusion assembly; 41. cylinder; 411. arc groove; 42. metal plate; 421. rolling ball; 43. weighted ball; 44. traction rope; 5. inkjet assembly; 51. pressure plate; 52. rubber bag; 53. discharge pipe; 54. block; 6. slideway three; 61. spring group; 62. groove; 7. cleaning assembly; 71. triangle block; 72. hinge ball; 73. elastic band. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 7 , the present invention provides a technical solution:

[0027] A screen printing system, such as Figure 1 As shown, it includes a base frame 1 and a printing support frame 2, the printing support frame 2 is movably installed at the upper end of the base frame 1, and the left outer surface of the printing support frame 2 is connected to the left outer surface of the base frame 1 by a hinge, a storage table 11 is fixedly installed on the upper outer surface of the base frame 1, a printing screen 21 is embedded in the bottom position of the inner surface of the printing support frame 2, and a driving mechanism 3 is movably installed on the upper end of the printing support frame 2. The purpose of setting the driving mechanism 3 is to uniformly discharge ink and print, thereby improving work efficiency.

[0028] During operation, the printing support frame 2 is first turned left by 180 degrees, and the printing support frame 2 is separated from the upper end of the base frame 1. Then, the paper to be printed can be laid flat on the storage table 11, and then the printing support frame 2 is turned over to its original position. The printing support frame 2 is located at the upper end of the base frame 1, and the paper is pressed between the printing screen 21 and the storage table 11. Then, the driving mechanism 3 can be pushed. The driving mechanism 3 can evenly discharge ink and also scratch the surface of the printing screen 21 during the movement process, so that the ink is evenly smeared on the paper through the printing screen 21. After the paper is printed, the printing support frame 2 can be turned over again to remove the printed paper.

[0029] As an embodiment of the present invention, Figure 2As shown, the driving mechanism 3 includes a circular frame 31, a roller 32, a gear 33, a scraper 34 and a push rod 35. The circular frame 31 is movably installed at the position of the printing support frame 2, and the front end outer surfaces of the two are also connected by a hinge. The rear end of the circular frame 31 extends to 3 cm to 5 cm from the rear end of the printing support frame 2. The left and right sides of the inner surface of the circular frame 31 are provided with a slide groove 311. The roller 32 is horizontally placed at the front end position of the circular frame 31. The number of the gears 33 is two groups, and the two groups of gears 33 are respectively connected to rotate At the left and right sides of the roller 32, the gear 33 is also slidably connected to the inside of the slide groove 311. An extrusion assembly 4 is installed between the left and right groups of gears 33 through a one-way bearing, and the extrusion assembly 4 passes through the inside of the roller 32 near the upper end. An inkjet assembly 5 is arranged near the lower end of the roller 32. The scraper 34 is fixedly installed at the lower end of the roller 32, and the scraper 34 is connected to the inkjet assembly 5. The push rod 35 is fixedly installed at the middle position of the front end outer surface of the roller 32, and the push rod 35 passes through the front end outer surface of the circular frame 31.

[0030] During operation, after the paper is limited, the push rod 35 can be pushed, and the push rod 35 can cause the roller 32 to move inside the circular frame 31. The gears 33 on both sides of the roller 32 slide inside the slide groove 311. The scraper 34 moves with the roller 32 and contacts the printing screen 21, so that the ink can be evenly applied to the printing screen 21, and then the ink is applied to the paper through the printing screen 21. The paper is printed by pushing, and it only needs one hand to operate, which improves work efficiency.

[0031] As an embodiment of the present invention, Figure 2 As shown, a second slide groove 312 is provided on the inner surface of the first slide groove 311 near the bottom front end, and the length of the second slide groove 312 is one quarter of the length of the first slide groove 311. Tooth blocks 313 are fixedly installed at equal distances inside the second slide groove 312, and the outer surface of the upper end of the tooth block 313 is in the same plane as the inner surface of the first slide groove 311.

[0032] During operation, when the driving mechanism 3 is pushed to move backward, the gear 33 first slides to the inside of the second slide groove 312, and the gear 33 meshes with the tooth block 313, and continues to push backward. The gear 33 rotates under the action of the tooth block 313, and the extrusion assembly 4 connected between the two sets of gears 33 rotates accordingly, until the gear 33 rotates to the rear end of the second slide groove 312 and approaches the inside of the first slide groove 311, and the extrusion assembly 4 turns over 180 degrees. The gear 33 can assist the extrusion assembly 4 to turn over, so as to squeeze the inkjet assembly 5 for automatic inkjet.

[0033] As an embodiment of the present invention, Figure 4 , Figure 5 and Figure 6As shown, the extrusion component 4 and the inkjet component 5 are opposite to each other in upper and lower directions, and the extrusion component 4 includes a cylinder 41, a metal plate 42, a counterweight ball 43 and a traction rope 44. The outer surface of the upper end of the cylinder 41 is provided with an arc-shaped notch, and the inner surface of the cylinder 41 is provided with arc-shaped grooves 411 on the left and right sides near the upper end. The metal plate 42 is made of high-toughness metal and has a bending notch at the middle upper end. Rolling balls 421 are fixedly installed on the left and right sides of the metal plate 42, and the rolling balls 421 are slidably connected to the lower end of the arc-shaped groove 411. The counterweight ball 43 is fixedly installed in the middle position of the outer surface of the lower end of the metal plate 42, and a traction rope 44 is fixedly connected between the counterweight ball 43 and the inner surface of the cylinder 41.

[0034] During operation, when the gear 33 rotates to the rear end of the second slide groove 312 and approaches the inside of the first slide groove 311, the extrusion assembly 4 turns over 180 degrees, the arc opening of the cylinder 41 faces downward, and its internal structure also turns over 180 degrees. The metal plate 42 is located at the lower end of the counterweight ball 43, and the metal plate 42 is pressed downward by the gravity of the counterweight ball 43. The traction rope 44 is stretched, and the rolling balls 421 on both sides of the metal plate 42 slide downward along the arc groove 411. The middle position of the metal plate 42 is subjected to the greatest force and bends. The bent part of the metal plate 42 passes through the arc opening and presses the inkjet assembly 5 at the lower end, thereby prompting the inkjet assembly 5 rotates downward to spray ink, and after a proper amount of ink is sprayed, the push rod 35 can be pushed further, and the gear 33 and the remaining tooth block 313 inside the second slide 312 continue to mesh and transmit, the arc-shaped notch of the cylinder 41 faces upward, and the internal mechanisms thereof are all returned to their positions, and the extrusion component 4 stops applying pressure to the inkjet component 5 until the gear 33 slides normally into the first slide 311, and then the inkjet can be stopped and the extruded ink can be evenly spread by the scraper 34. Through the one-way bearing design between the extrusion component 4 and the gear 33, the extrusion component 4 starts to move only when the gear 33 rotates from the second slide 312 to the inside of the first slide 33. This structure can realize automatic inkjet and reduce the process of manual ink squeezing.

[0035] As an embodiment of the present invention, Figure 4 As shown, the inkjet assembly 5 includes a pressure plate 51, a rubber bag 52 and a discharge pipe 53. The rubber bag 52 is fixedly installed at the middle position of the lower end of the inner surface of the roller 32, and the pressure plate 51 is fixedly installed at the upper end of the rubber bag 52. The discharge pipe 53 is fixedly installed at an equal distance on the outer surface of the lower end of the rubber bag 52, and the discharge pipe 53 extends to the inside of the scraper 34. The lower end of the discharge pipe 53 has an oblique structure design, and the pipe mouth is connected to the outside. The length of the scraper 34 is the same as the width of the printing screen 21, and the left and right sides of the scraper 34 are fixedly installed with a pressure block 54.

[0036] During operation, when the extrusion assembly 4 is extruded downward, the metal plate 42 is folded and pressed downward against the pressing plate 51. The pressing plate 51 is pressed downward against the rubber bag 52. The ink inside the rubber bag 52 can flow downward evenly through the walls of the multiple groups of discharge pipes 53 and the plate body of the scraper 34, thereby reducing the occurrence of ink accumulation caused by manual ink squeezing.

[0037] As an embodiment of the present invention, Figure 6 and Figure 7 As shown, the left and right sides of the inner surface of the printing support frame 2 are provided with a slide groove 3 6, and the stop block 54 is slidably connected to the front end position inside the slide groove 3 6, and a spring group 61 is fixedly connected between the stop block 54 and the slide groove 3 6, and a groove 62 is provided on the inner surface of the printing support frame 2 near the rear end of the printing screen 21, and a cleaning component 7 is movably installed at equal distances inside the groove 62.

[0038] During operation, the push rod 35 pushes the scraper 34 to move backward, and the scraper 34 passes through the upper end of the printing screen 21 in turn. The stop block 54 slides backward in the slide groove 3 6 as the scraper 34, and the spring group 61 is pushed and compressed by the stop block 54. The setting of the stop block 54 can improve the smooth movement of the scraper 34. At the same time, when the scraper 34 finishes scraping the surface of the printing screen 21, the push rod 35 is properly released, the scraper 34 loses the thrust, and rebounds under the elastic force of the spring group 61. The scraper 34 drives the entire driving mechanism 3 to rebound to the junction of the slide groove 1 311 and the slide groove 2 312. During the process of the scraper 34 moving back, the excess ink can be scraped back and spread on the surface of the printing screen 21 again, so that the surface of the printing screen 21 can be kept moist and the ink can be applied more evenly.

[0039] As an embodiment of the present invention, Figure 7 As shown, the cleaning assembly 7 includes a triangular block 71 and a hinge ball 72. The hinge ball 72 is fixedly mounted on the outer surface of the lower end of the triangular block 71, and the lower end of the hinge ball 72 is hinged to the bottom of the groove 62. The upper end of the triangular block 71 penetrates and extends to 2 cm to 3 cm from the upper end of the groove 62. The outer surfaces of the front and rear ends of the triangular block 71 are both provided with rough surfaces.

[0040] During operation, the push rod 35 pushes the scraper 34 to move backward, and the scraper 34 passes through the upper end of the printing screen 21 in turn, until the scraper 34 passes through the area of ​​the printing screen 21 and can be introduced into the upper end of the groove 62, the scraper 34 and the triangular block 71 touch each other, and the outer surface of the rear end of the scraper 34 and the rough surface of the front end of the triangular block 71 rub against each other, so that the ink stains remaining in the ink scraping area of ​​the scraper 34 can be scraped off. When the moving area of ​​the scraper 34 exceeds the groove 62, when it rebounds under the elastic force of the spring group 61, the end surface of the other side of the scraper 34 and the triangular block 71 are also rubbed and cleaned, thereby improving the cleanliness of the bottom of the scraper 34 and improving the printing effect.

[0041] As an embodiment of the present invention, Figure 7 As shown, an elastic band 73 is fixedly connected between two adjacent triangular blocks 71 near the lower end, and the two triangular blocks 71 near the left and right sides are also fixedly connected to the inner wall of the groove 62 through the elastic band 73.

[0042] During operation, when the triangular block 71 is resisted by the scraper 34, it swings back and forth under the action of the hinge ball 72, and the elastic band 73 can assist the triangular block 71 to return to its original position quickly. At the same time, the ink stains that fall off due to friction on both sides of the triangular block 71 fall on the upper end of the elastic band 73.

[0043] Working principle: When working, first turn the printing support frame 2 to the left by 180 degrees, and the printing support frame 2 is separated from the upper end of the bottom frame 1. Then, the paper to be printed can be laid flat on the storage table 11, and then the printing support frame 2 is turned to its original position. The printing support frame 2 is located at the upper end of the bottom frame 1, and the paper is pressed between the printing screen 21 and the storage table 11. By pushing the push rod 35, the push rod 35 can cause the roller 32 to move inside the circular frame 31. The gear 33 first slides to the inside of the second slide groove 312, and the gear 33 meshes with the tooth block 313, and continues to push backward. The wheel 33 rotates under the action of the tooth block 313, and the extrusion assembly 4 connected between the two sets of gears 33 rotates accordingly, until the gear 33 rotates to the rear end of the second slide groove 312 and approaches the inside of the first slide groove 311. After the extrusion assembly 4 turns over 180 degrees, the arc opening of the cylinder 41 faces downward, and its internal structure also turns over 180 degrees. The metal plate 42 is located at the lower end of the counterweight ball 43, and the metal plate 42 is pressed downward by the gravity of the counterweight ball 43, and the traction rope 44 is stretched, and the rolling balls 421 on both sides of the metal plate 42 move along the arc. The groove 411 slides downward, and the middle position of the metal plate 42 is subjected to the greatest force and bends. The bent part of the metal plate 42 passes through the arc opening and presses the inkjet assembly 5 at the lower end. When the extrusion assembly 4 is pressed downward, the metal plate 42 folds and presses downward against the pressing plate 51. The pressing plate 51 is pressed downward and presses the rubber bag 52. The ink inside the rubber bag 52 can flow downward evenly through the tube walls of the multiple groups of discharge pipes 53 and the plate body of the scraper 34. The scraper 34 is pushed backward by the push rod 35, and the scraper 34 passes through the upper end of the printing screen 21 in turn. Printing is carried out. After the printing of the paper is completed, the printing support frame 2 can be turned over again to remove the printed paper. When too much ink stains are accumulated at the bottom of the scraper 34, the push rod 35 can be used to push the scraper 34 to move backward. The scraper 34 passes through the upper end of the printing screen 21 in sequence until the scraper 34 passes through the area of ​​the printing screen 21 and can be introduced into the upper end of the groove 62. The scraper 34 and the triangular block 71 touch each other, and the outer surface of the rear end of the scraper 34 and the rough surface of the front end of the triangular block 71 rub against each other, so that the ink stains remaining in the scraping area of ​​the scraper 34 can be scraped off.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screen printing system, comprising a base frame (1) and a printing support frame (2), characterized in that: The printing support frame (2) is movably mounted on the upper end of the base frame (1), and the left outer surface of the printing support frame (2) is connected to the left outer surface of the base frame (1) via a hinge; a storage table (11) is fixedly mounted on the upper outer surface of the base frame (1); a printing screen (21) is embedded at the bottom of the inner surface of the printing support frame (2); and a driving mechanism (3) is movably mounted on the upper end of the printing support frame (2); The driving mechanism (3) comprises a circular frame (31), a roller (32), a gear (33), a scraper (34) and a push rod (35); the circular frame (31) is movably mounted at the position of the printing support frame (2), and the front end outer surfaces of the two are also connected by a hinge; the rear end of the circular frame (31) extends to 3 cm to 5 cm from the rear end of the printing support frame (2); the left and right sides of the inner surface of the circular frame (31) are both provided with a slide groove (311); the roller (32) is horizontally placed at the front end of the circular frame (31); the gear (33) is in two groups, and the two groups of gears (33) are respectively rotatably connected to the roller (32) and the push rod (35); The roller (32) is provided with a left and right side position of the roller (32), and the gear (33) is also slidably connected inside the slide groove (311). An extrusion assembly (4) is installed between the left and right groups of gears (33) through a one-way bearing, and the extrusion assembly (4) passes through the inside of the roller (32) near the upper end. An inkjet assembly (5) is arranged inside the roller (32) near the lower end. The scraper (34) is fixedly installed at the lower end of the roller (32), and the scraper (34) is connected to the inkjet assembly (5). The push rod (35) is fixedly installed at the middle position of the front end outer surface of the roller (32), and the push rod (35) passes through the front end outer surface of the circular frame (31); The inkjet assembly (5) comprises a pressure plate (51), a rubber bag (52) and a discharge pipe (53); the rubber bag (52) is fixedly mounted at the middle position of the lower end of the inner surface of the roller (32), and the pressure plate (51) is fixedly mounted at the upper end of the rubber bag (52); the discharge pipe (53) is fixedly mounted at an equal distance on the outer surface of the lower end of the rubber bag (52), and the discharge pipe (53) extends to the inside of the scraper (34); the lower end of the discharge pipe (53) has an oblique opening structure, and the opening is connected to the outside; the length of the scraper (34) is the same as the width of the printing screen (21), and the left and right sides of the scraper (34) are fixedly mounted with a pressure block (54); The inner surface of the first slide groove (311) is provided with a second slide groove (312) near the bottom front end, and the length of the second slide groove (312) is one quarter of the length of the first slide groove (311), and tooth blocks (313) are fixedly installed at equal distances inside the second slide groove (312), and the outer surface of the upper end of the tooth block (313) and the inner surface of the first slide groove (311) are located in the same plane; The extrusion assembly (4) and the inkjet assembly (5) are arranged opposite to each other in the upper and lower parts. The extrusion assembly (4) comprises a cylinder (41), a metal plate (42), a counterweight ball (43) and a traction rope (44). An arc-shaped notch is provided on the outer surface of the upper end of the cylinder (41), and arc-shaped grooves (411) are provided on the inner surface of the cylinder (41) near the upper end on the left and right sides. The metal plate (42) is made of a high-toughness metal material and has a bending notch provided at the middle upper end thereof. Rolling balls (421) are fixedly installed on the left and right sides of the metal plate (42), and the rolling balls (421) are slidably connected to the lower end of the arc-shaped groove (411). The counterweight ball (43) is fixedly installed at the middle position of the outer surface of the lower end of the metal plate (42), and a traction rope (44) is fixedly connected between the counterweight ball (43) and the inner surface of the cylinder (41); The left and right sides of the inner surface of the printing support frame (2) are both provided with a slide groove (6), and a stopper (54) is slidably connected to the front end of the slide groove (6), a spring group (61) is fixedly connected between the stopper (54) and the slide groove (6), a groove (62) is provided on the inner surface of the printing support frame (2) near the rear end of the printing screen (21), and a cleaning component (7) is movably installed at equal distances inside the groove (62); The cleaning assembly (7) comprises a triangular block (71) and a hinge ball (72), wherein the hinge ball (72) is fixedly mounted on the outer surface of the lower end of the triangular block (71), and the lower end of the hinge ball (72) is hinged to the bottom of the groove (62), the upper end of the triangular block (71) penetrates and extends to 2 cm to 3 cm above the upper end of the groove (62), and the outer surfaces of the front and rear ends of the triangular block (71) are both provided with rough surfaces; When working, the printing support frame (2) is first turned leftward by 180 degrees, and the printing support frame (2) is separated from the upper end of the bottom frame (1). Then, the paper to be printed can be laid flat on the storage table (11), and then the printing support frame (2) is turned back to its original position. The printing support frame (2) is located at the upper end of the bottom frame (1), and the paper is pressed between the printing net (21) and the storage table (11). By pushing the push rod (35), the push rod (35) can cause the roller (32) to move inside the circular frame (31), and the gear (33) first slides into the inside of the second slide groove (312), and the gear (33) is meshed with the tooth block (313). Then, the gear (33) is pushed backward, and the gear (33) is pushed backward. The extrusion assembly (4) connected between the two sets of gears (33) rotates under the action of the tooth block (313), and the extrusion assembly (4) rotates accordingly, until the gear (33) rotates to the rear end of the second slide groove (312) and approaches the inside of the first slide groove (311). After the extrusion assembly (4) turns 180 degrees, the arc opening of the cylinder (41) faces downward, and its internal structure also turns 180 degrees. The metal plate (42) is located at the lower end of the counterweight ball (43), and the metal plate (42) is pressed downward by the gravity of the counterweight ball (43), the traction rope (44) is stretched, and the rolling balls (421) on both sides of the metal plate (42) are moved along the arc. The metal plate (42) is bent due to the maximum force in the middle of the metal plate (42). The bent part of the metal plate (42) passes through the arc-shaped opening and presses the inkjet assembly (5) at the lower end. When the extrusion assembly (4) is pressed downward, the metal plate (42) is folded and presses downward against the pressing plate (51). The pressing plate (51) is pressed downward and presses the rubber bag (52). The ink inside the rubber bag (52) can flow downward evenly through the tube walls of the multiple groups of discharge tubes (53) and the plate body of the scraper (34). The scraper (34) is pushed backward by the push rod (35). The scraper (34) passes through the upper end of the printing screen (21) in sequence. , printing can be carried out. After the printing of the paper is completed, the printing support frame (2) can be turned over again to remove the printed paper. When too much ink stains are accumulated at the bottom of the scraper (34), the push rod (35) can be used to push the scraper (34) to move backwards. The scraper (34) passes through the upper end of the printing screen (21) in sequence until the scraper (34) passes through the area of ​​the printing screen (21) and can be introduced into the upper end of the groove (62). The scraper (34) and the triangular block (71) touch each other, and the outer surface of the rear end of the scraper (34) and the rough surface of the front end of the triangular block (71) rub against each other, so that the ink stains remaining in the scraping area of ​​the scraper (34) can be scraped off.

2. A screen printing system according to claim 1, characterized in that: An elastic band (73) is fixedly connected between two adjacent triangular blocks (71) at positions close to the lower ends, and the two triangular blocks (71) close to the left and right sides are also fixedly connected to the inner wall of the groove (62) via the elastic band (73).

Images