CN220053182U

CN220053182U - Screen printer

Info

Publication number: CN220053182U
Application number: CN202321049012.4U
Authority: CN
Inventors: 高银
Original assignee: Kunshan Bigao Electronic Technology Co ltd
Current assignee: Kunshan Bigao Electronic Technology Co ltd
Priority date: 2023-05-05
Filing date: 2023-05-05
Publication date: 2023-11-21
Anticipated expiration: 2033-05-05

Abstract

The utility model relates to the technical field of printing machines, in particular to a screen printing machine, which comprises a workbench, wherein a backboard is arranged on the outer side of the workbench, a lifting mechanism is arranged at the upper end of the backboard, a screen plate mechanism is connected with the lower end of the lifting mechanism, a printing mechanism is arranged on the outer side of the backboard, the printing mechanism is sleeved with the lifting mechanism, a positioning mechanism is arranged at the upper end of the backboard, and a buffer mechanism is arranged at the upper end of the backboard, and corresponds to the screen plate mechanism in position.

Description

Screen printer

Technical Field

The utility model relates to the technical field of printing machines, in particular to a screen printing machine.

Background

The screen printer is a machine using a screen plate Shi Yin. A printer is a machine for printing characters and images, and is a generic term for machines or apparatuses for producing printed matter.

Most of the existing screen printers fix the screen plate through a large number of screw nuts and other parts, the installation, the disassembly and the replacement are more troublesome, the screen plate is generally larger, the ink is randomly moved on the screen plate during ink return, so that uneven distribution is easily caused, and meanwhile, a large amount of ink exists at the part which does not need to be printed, so that the using effect is poor.

Disclosure of Invention

The present utility model aims to solve the drawbacks of the prior art, and proposes a screen printer to solve the problem.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a screen printer, includes the workstation, the backplate is installed in the outside of workstation, elevating system is installed to the upper end of backplate, elevating system's lower extreme is connected with silk screen plate mechanism, print mechanism is installed in the outside of backplate, print mechanism cup joints mutually with elevating system, the upper end of backplate is provided with positioning mechanism, the upper end of backplate is provided with buffer gear, buffer gear is corresponding with silk screen plate mechanism's position.

Further, elevating system is including roof, pneumatic cylinder, backup pad and support column, the upper end at the backplate is installed to the roof, the pneumatic cylinder is installed to the upper end of roof, the lower extreme of pneumatic cylinder runs through the roof and connects the backup pad through the hydraulic stem, the lower extreme of backup pad is connected with silk screen version mechanism through two support columns.

Further, silk screen version mechanism is including screen frame, notch, logical groove, fixed strip, bolt, first nut, half tone, draw-in strip and draw-in groove, the lower extreme at the support column is installed to the screen frame, screen frame lower extreme one side sets up the notch, upper end one side of screen frame is provided with the logical groove that is linked together with it, the fixed strip is pegged graft in the inner chamber of notch, the fixed strip passes logical groove and the first nut of spiro union through the bolt, the fixed strip all sets up the draw-in groove with the inboard of screen frame, the equal joint draw-in strip of inner chamber of draw-in groove, connect the half tone jointly between the draw-in strip.

Further, printing mechanism is including fixed plate, first cylinder, rectangular channel, L template, back black subassembly and scrape black subassembly, the outside at the backplate is installed to the fixed plate, the upper end of fixed plate sets up rectangular channel, the inner chamber in rectangular channel is provided with the L template with inside diameter size assorted, first cylinder is installed to the upper end of fixed plate, first cylinder is connected with L template through the output pole, the upper end of L template is provided with back black subassembly and scrapes black subassembly, the outside of fixed plate is provided with two locating sleeves that cup joint with the support column looks activity.

Further, the ink return assembly comprises a second cylinder installed at the upper end of the L-shaped plate, the lower end of the second cylinder penetrates through the L-shaped plate through an output rod and is connected with a supporting frame, the lower end of the supporting frame is connected with a base plate, the upper end of the base plate is movably connected with two movable shafts through bearings, the lower ends of the movable shafts are respectively connected with an auxiliary ink return plate, one corresponding side of each auxiliary ink return plate is respectively connected with a main ink return plate through a rubber connecting belt in a joint mode, the main ink return plates are in threaded connection with the base plate through screws, gears are sleeved on the outer sides of the movable shafts, toothed plates are meshed on the outer sides of the gears, one ends of the toothed plates are connected with a push plate in a joint mode, a fourth cylinder is installed at the upper end of the base plate and is connected with the push plate through the output rod, limit grooves are symmetrically formed in the upper end of the base plate, and the lower end of the push plate is connected with a T-shaped block in sliding connection with the limit grooves.

Further, scrape the black subassembly including installing the third cylinder in L template upper end, the lower extreme of third cylinder runs through L template and is connected with the mounting panel through the output pole, the mounting panel has the scraper through the screw spiro union.

Further, positioning mechanism is including setting up two locating levers in the workstation upper end, the upper end of workstation is provided with the spout, the outside symmetry of workstation is provided with the removal groove that is linked together with it, the lower extreme of locating lever all is connected with the slider that slides mutually with the spout, the slider all passes the removal groove through the threaded rod and the spiro union has the second nut.

Further, the upper end of workstation is provided with the recess, buffer gear is including installing the spring at the recess inner chamber, the upper end of spring is connected with the bottom plate, the upper end bonding of bottom plate has the rubber slab, the lower extreme of bottom plate is connected with the dustcoat, the width of dustcoat and the width assorted of recess.

The screen printer provided by the utility model has the beneficial effects that:

the output shaft of the second cylinder drives the support frame, the base plate and the main ink return plate and the auxiliary ink return plate at the lower end of the base plate to descend until the position corresponds to the printing ink position at the upper end of the screen plate, the output rod of the first cylinder drives the L-shaped plate and the second cylinder at the upper end of the L-shaped plate to move rightwards, so that the main ink return plate and the auxiliary ink return plate can uniformly return the printing ink at the upper end of the screen plate from left to right, and meanwhile, the output rod of the fourth cylinder drives the push plate to reciprocate leftwards and rightwards, the push plate drives the two toothed plates to reciprocate leftwards and rightwards, the toothed plates drive the movable shafts of the gear and the inner cavity of the toothed plates to reciprocate leftwards and rightwards, the movable shafts drive the auxiliary ink return plate to swing in an arc shape, the ink return area is increased conveniently, the ink flowing to a position far away from printing is scraped backwards, the ink return effect is improved effectively, and the ink return effect is convenient to use;

the clamping strip on one side of the screen plate is inserted into the clamping groove on the outer side of the fixing strip, the clamping strip on the other side of the screen plate is placed into the notch through the fixing strip, at the moment, the clamping strip on the other side of the screen plate is moved and inserted into the clamping groove on the inner side of the screen frame, the fixing strip is conveniently fixed through tightening the first nut on the outer side of the bolt on the upper end of the fixing strip, and then the screen plate is conveniently and rapidly installed and clamped and fixed, the installation efficiency of the screen plate is effectively improved, and the screen plate is convenient to install, disassemble and replace.

Drawings

FIG. 1 is a schematic view of the overall three-dimensional structure of the present utility model;

FIG. 2 is a schematic view of a portion of a three-dimensional structure according to the present utility model;

fig. 3 is a schematic diagram of a three-dimensional split structure of a lifting mechanism and a three-dimensional split structure of a screen plate mechanism;

fig. 4 is a schematic diagram of a three-dimensional split structure of a positioning mechanism and a three-dimensional split structure of a buffer mechanism according to the present utility model;

FIG. 5 is a schematic perspective view of a printing mechanism according to the present utility model;

FIG. 6 is a schematic perspective view of a part of a printing mechanism according to the present utility model;

FIG. 7 is an enlarged schematic view of the portion A of the device of FIG. 6 according to the present utility model;

fig. 8 is a schematic bottom view of a part of a printing mechanism according to the present utility model.

In the figure: the ink supply device comprises a workbench 1, a backboard 2, a lifting mechanism 3, a top plate 31, a hydraulic cylinder 32, a supporting plate 33, a supporting column 34, a screen plate mechanism 4, a screen frame 41, a notch 42, a through groove 43, a fixing bar 44, a bolt 45, a first nut 46, a screen plate 47, a clamping bar 48, a clamping groove 49, a printing mechanism 5, a fixing plate 51, a first cylinder 52, a rectangular groove 53, an L-shaped plate 54, an ink return assembly 55, a second cylinder 551, a supporting frame 552, a substrate 553, a main ink return plate 554, a secondary ink return plate 555, a movable shaft 556, a gear 557, a toothed plate 558, a push plate 559, a fourth cylinder 5510, a limiting groove 5511, a rubber connecting belt 5512, a T-shaped block 5513, a ink scraping assembly 56, a third cylinder 561, a mounting plate 562, a scraper, a positioning sleeve 57, a positioning mechanism 6, a positioning rod 61, a sliding block 62, a threaded rod 63, a second nut 64, a buffer mechanism 7, a spring 71, a bottom plate 72, a rubber plate 73, an outer cover 74, a chute 8, a movable groove 9, and a groove 10.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 1 to 8, a screen printer comprises a workbench 1, a backboard 2 is installed on the outer side of the workbench 1, a lifting mechanism 3 is installed at the upper end of the backboard 2, the lifting mechanism 3 comprises a top plate 31, a hydraulic cylinder 32, a supporting plate 33 and a supporting column 34, the top plate 31 is installed at the upper end of the backboard 2, the hydraulic cylinder 32 is installed at the upper end of the top plate 31, the lower end of the hydraulic cylinder 32 penetrates through the top plate 31 and is connected with the supporting plate 33 through a hydraulic rod, the lower end of the supporting plate 33 is connected with a screen printing mechanism 4 through two supporting columns 34, the supporting plate 33 and the supporting column 34 are driven to move downwards through the hydraulic rod of the hydraulic cylinder 32, the supporting column 34 is convenient to drive the screen printing plate 47 of the screen printing mechanism 4 to move downwards to contact with a product with printing tape, the printing mechanism 5 is convenient to print, automatic lifting is convenient, the supporting column 34 is sleeved in the inner cavity of a positioning sleeve 57, the supporting column 34 is convenient to move stably up and down, and the use is convenient.

The lower extreme of elevating system 3 is connected with silk screen plate mechanism 4, silk screen plate mechanism 4 is including screen frame 41, notch 42, lead to groove 43, fixed strip 44, bolt 45, first nut 46, screen plate 47, clamping strip 48 and draw-in groove 49, the lower extreme at support column 34 is installed to screen frame 41, one side of screen frame 41 lower extreme sets up notch 42, upper end one side of screen frame 41 is provided with the logical groove 43 that is linked together with it, fixed strip 44 is pegged graft in the inner chamber of notch 42, fixed strip 44 passes through logical groove 43 and spiro union first nut 46 through bolt 45, all set up draw-in groove 49 in the inboard of fixed strip 44 and screen frame 41, the inner chamber of clamping groove 49 all joint clamping strip 48, joint screen plate 47 between the clamping strip 48, insert in the draw-in groove 49 in the outside of fixed strip 44 through the clamping strip 48 of screen plate 47 side, at this moment, the clamping strip 48 of the opposite side of screen plate 47 moves along with and inserts in the draw-in groove 49 of the inboard of screen frame 41, in the first nut 46 outside through tightening the upper end of fixed strip 44, the convenient for carrying out quick change to fixed strip 44, and quick change, and convenient installation, and convenient quick change.

The printing mechanism 5 is arranged on the outer side of the backboard 2, the printing mechanism 5 is sheathed with the lifting mechanism 3, the printing mechanism 5 comprises a fixed plate 51, a first air cylinder 52, a rectangular groove 53, an L-shaped plate 54, an ink return component 55 and an ink scraping component 56, the fixed plate 51 is arranged on the outer side of the backboard 2, the rectangular groove 53 is arranged at the upper end of the fixed plate 51, an L-shaped plate 54 matched with the inner diameter is arranged in an inner cavity of the rectangular groove 53, the first air cylinder 52 is arranged at the upper end of the fixed plate 51, the first air cylinder 52 is connected with the L-shaped plate 54 through an output rod, the ink return component 55 and the ink scraping component 56 are arranged at the upper end of the L-shaped plate 54, two positioning sleeves 57 which are movably sheathed with the support columns 34 are arranged at the outer side of the fixed plate 51, the ink return component 55 comprises a second air cylinder 551 arranged at the upper end of the L-shaped plate 54, the lower end of the second air cylinder 551 penetrates through the L-shaped plate 54 through the output rod and is connected with a support frame 552, the lower end of the support frame 552 is connected with a substrate 553, the upper end of the baseplate 553 is movably connected with two movable shafts 556 through bearings, the lower ends of the movable shafts 556 are respectively connected with an auxiliary ink returning plate 555, one corresponding side of the auxiliary ink returning plate 555 is respectively connected with a main ink returning plate 554 through a rubber connecting belt 5512, the main ink returning plate 554 is in threaded connection with the baseplate 553 through screws, the outer sides of the movable shafts 556 are respectively sleeved with a gear 557, the outer sides of the gears 557 are respectively meshed with a toothed plate 558, one end of the toothed plate 558 is jointly connected with a push plate 559, the upper end of the baseplate 553 is provided with a fourth cylinder 5510, the fourth cylinder 5510 is connected with the push plate 559 through an output rod, the upper end of the baseplate 553 is symmetrically provided with a limiting groove 5511, the lower end of the push plate 559 is connected with a T-shaped block 5513 which is in sliding connection with the auxiliary ink returning plate 555, the ink scraping assembly 56 comprises a third cylinder 561 which is arranged at the upper end of the L-shaped plate 54, the lower end of the third cylinder 561 penetrates through the L-shaped plate 54 through the output rod and is connected with a mounting plate 562, the mounting plate 562 is connected with the scraper 563 by screw, the ink return assembly 55 and the ink scraping assembly 56 at the upper end of the L-shaped plate 54 are driven by the output rod of the first cylinder 52 to move left and right, ink return and printing are conveniently carried out, the scraper 563 at the mounting plate 562 and the lower end thereof are driven by the output rod of the third cylinder 561 to move downwards until the scraper 563 is attached to the screen 47, the L-shaped plate 54 and the third cylinder 561 at the upper end thereof are driven by the output rod of the first cylinder 52 to move left, ink scraping printing treatment is conveniently carried out at the upper end of the screen 47 by the scraper 563, when the ink scraping assembly 56 is completed, the scraper 563 is driven by the output rod to move upwards by the shrinkage of the third cylinder 561, the screen printing mechanism 4 is driven by the lifting mechanism 3 to move upwards, the support frame 552 and the substrate 553 are driven by the output shaft of the second cylinder 551, so that the base plate 553 drives the main ink returning plate 554 and the auxiliary ink returning plate 555 at the lower end of the base plate 553 to descend until the position corresponding to the printing ink at the upper end of the screen plate 47, the output rod of the first air cylinder 52 drives the L-shaped plate 54 and the second air cylinder 551 at the upper end of the L-shaped plate 54 to move rightwards, the main ink returning plate 554 and the auxiliary ink returning plate 555 are convenient for uniformly returning the printing ink at the upper end of the screen plate 47 from left to right, meanwhile, the output rod of the fourth air cylinder 5510 drives the push plate 559 to reciprocate leftwards and rightwards in the process, the push plate 559 further stably moves in the inner cavity of the limiting groove 5511 through the T-shaped block 5513 and simultaneously drives the two toothed plates 558 to reciprocate leftwards and rightwards, the toothed plate 558 drives the toothed wheel 557 meshed with the toothed plate and the movable shaft 556 of the inner cavity thereof to synchronously reciprocate leftwards and rightwards, the movable shaft 556 is convenient for driving the auxiliary ink returning plate 555 to swing in an arc shape, the ink returning area is convenient to increase, the ink returning ink is convenient to be scraped backwards, the ink returning effect is effectively improved, convenient to use.

The upper end of backplate 2 is provided with positioning mechanism 6, positioning mechanism 6 is including setting up two locating levers 61 in workstation 1 upper end, the upper end of workstation 1 is provided with spout 8, the outside symmetry of workstation 1 is provided with the removal groove 9 that is linked together with it, the lower extreme of locating lever 61 all is connected with the slider 62 that is linked together with spout 8, slider 62 all passes removal groove 9 and spiro union through threaded rod 63 has second nut 64, according to the size of product to be printed, through unscrewing second nut 64, thereby remove two threaded rods 63 and move towards opposite or the same direction, and then threaded rod 63 passes removal groove 9 and through slider 62 at the steady drive two locating levers 61 of inner chamber of spout 8 towards opposite or the same direction, be convenient for carry out the location centre gripping of product to be printed, at screwing up second nut 64, the product stable printing of being convenient for, the effectual result of use that has improved.

The upper end of backplate 2 is provided with buffer gear 7, buffer gear 7 is corresponding with the position of silk screen mechanism 4, the upper end of workstation 1 is provided with recess 10, buffer gear 7 is including installing the spring 71 at the recess 10 inner chamber, the upper end of spring 71 is connected with bottom plate 72, the upper end of bottom plate 72 bonds there is rubber slab 73, the lower extreme of bottom plate 72 is connected with dustcoat 74, the width of dustcoat 74 and the width assorted of recess 10, when screen frame 41 drives screen plate 47 and moves down, through the bottom plate 72 of screen frame 41 lower extreme both sides extrusion rubber slab 73 and lower extreme, and bottom plate 72 carries out pressure buffering through compression spring 71, be convenient for screen plate 47 when about to reach the up end of waiting to print the product, buffer the removal to it, avoid its direct impact to press at the up end of waiting to print the product, cause the damage to the silk screen of screen plate 47 to a certain extent, influence its life.

Working principle: the utility model connects the hydraulic cylinder 32, the first cylinder 52, the second cylinder 551, the third cylinder 561 and the fourth cylinder 5510 through the external PLC type controller, when in use, the second nut 64 is unscrewed, so that the two threaded rods 63 move in opposite or same directions, the threaded rods 63 pass through the moving groove 9 and stably drive the two positioning rods 61 to move in opposite or same directions through the inner cavity of the sliding groove 8 through the sliding block 62, the positioning and clamping of the product to be printed are facilitated, when the second nut 64 is screwed, the product is conveniently and stably printed, the supporting plate 33 and the supporting column 34 are driven to move downwards through the hydraulic rods of the hydraulic cylinder 32, the supporting column 34 is conveniently driven to drive the screen plate 47 of the screen plate mechanism 4 to move downwards to be in contact with the product with printing, at the moment, the two sides of the lower end of the screen frame 41 are pressed against the rubber plate 73 and the bottom plate 72 at the lower end thereof, the bottom plate 72 is subjected to pressure buffering through the compression spring 71, the screen 47 is convenient to buffer and move when the screen 47 is about to reach the upper end face of a product to be printed, the screen 47 is prevented from being directly impacted and pressed on the upper end face of the product to be printed, the service life of the screen is influenced to a certain extent, the mounting plate 562 and the scraper 563 at the lower end of the mounting plate are driven to move downwards by the output rod of the third cylinder 561 until the scraper 563 is attached to the screen 47, the L-shaped plate 54 and the third cylinder 561 at the upper end of the L-shaped plate are driven to move leftwards by the output rod of the first cylinder 52, the scraper 563 is convenient to carry out ink scraping printing treatment at the upper end of the screen 47, when the ink scraping assembly 56 is finished, the scraper 563 is driven to move upwards by the shrinkage output rod of the third cylinder 561, the screen mechanism 4 is driven to move upwards by the lifting mechanism 3, the support frame 552 and the substrate 553 are driven to move downwards by the output shaft of the second cylinder 551, therefore, the base plate 553 drives the main ink returning plate 554 and the auxiliary ink returning plate 555 at the lower end of the base plate 553 to descend until corresponding to the printing ink position at the upper end of the screen plate 47, the output rod of the first air cylinder 52 drives the L-shaped plate 54 and the second air cylinder 551 at the upper end of the L-shaped plate 54 to move rightwards, the printing ink at the upper end of the screen plate 47 is uniformly returned from left to right by the main ink returning plate 554 and the auxiliary ink returning plate 555, meanwhile, the output rod of the fourth air cylinder 5510 drives the push plate 559 to reciprocate left and right, the push plate 559 drives the two toothed plates 558 to reciprocate left and right, the toothed plates 558 drive the movable shaft 556 with the gear 557 and the inner cavity thereof to synchronously reciprocate left and right, the movable shaft 556 is convenient for driving the auxiliary ink returning plate 555 to swing in an arc shape, the ink returning area is increased conveniently, the ink flowing to a place far away from the printing part is convenient to scrape backwards, the effect of ink returning is improved, the effect is convenient to use, and the clamping strip 48 at one side of the screen plate 47 is inserted into the clamping groove 49 at the outer side of the fixing strip 44, meanwhile, the clamping strip 44 is placed into the notch 42, the clamping strip 47, the clamping strip 48 is arranged at the other side, the clamping strip 45 is convenient to replace the fixing strip 44, the clamping strip 45 and the fixing strip 45, the screen plate 45 is screwed down the fixing the screen plate 45, the fixing device is convenient to install and the fixing the screen plate 45, and the fixing the screen plate.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a screen printer, includes workstation (1), its characterized in that, backplate (2) are installed in the outside of workstation (1), elevating system (3) are installed to the upper end of backplate (2), the lower extreme of elevating system (3) is connected with silk screen version mechanism (4), print mechanism (5) are installed in the outside of backplate (2), print mechanism (5) cup joint mutually with elevating system (3), the upper end of backplate (2) is provided with positioning mechanism (6), the upper end of backplate (2) is provided with buffer gear (7), buffer gear (7) are corresponding with the position of silk screen version mechanism (4).

2. The screen printer according to claim 1, wherein the lifting mechanism (3) comprises a top plate (31), a hydraulic cylinder (32), a support plate (33) and support columns (34), the top plate (31) is arranged at the upper end of the back plate (2), the hydraulic cylinder (32) is arranged at the upper end of the top plate (31), the lower end of the hydraulic cylinder (32) penetrates through the top plate (31) through a hydraulic rod and is connected with the support plate (33), and the lower end of the support plate (33) is connected with the screen printing mechanism (4) through two support columns (34).

3. The screen printer according to claim 2, wherein the screen plate mechanism (4) comprises a screen frame (41), a notch (42), a through groove (43), a fixing strip (44), a bolt (45), a first nut (46), a screen plate (47), a clamping strip (48) and a clamping groove (49), the screen frame (41) is arranged at the lower end of the supporting column (34), the notch (42) is arranged at one side of the lower end of the screen frame (41), a through groove (43) communicated with the screen frame (41) is arranged at one side of the upper end of the screen frame (41), the fixing strip (44) is inserted into an inner cavity of the notch (42), the fixing strip (44) penetrates through the through groove (43) through the bolt (45) and is connected with the first nut (46) in a threaded mode, the clamping groove (49) is formed in the inner sides of the fixing strip (44) and the screen frame (41), the clamping strip (48) is clamped in the inner cavity of the clamping groove (49), and the screen plate (47) is connected between the clamping strips (48) in a joint mode.

4. The screen printer according to claim 2, wherein the printing mechanism (5) comprises a fixing plate (51), a first cylinder (52), a rectangular groove (53), an L-shaped plate (54), an ink return component (55) and an ink scraping component (56), the fixing plate (51) is arranged on the outer side of the back plate (2), the rectangular groove (53) is arranged at the upper end of the fixing plate (51), the inner cavity of the rectangular groove (53) is provided with the L-shaped plate (54) matched with the inner diameter, the first cylinder (52) is arranged at the upper end of the fixing plate (51), the first cylinder (52) is connected with the L-shaped plate (54) through an output rod, the ink return component (55) and the ink scraping component (56) are arranged at the upper end of the L-shaped plate (54), and two positioning sleeves (57) sleeved with the support columns (34) in a movable mode are arranged on the outer side of the fixing plate (51).

5. The screen printer according to claim 4, wherein the ink return assembly (55) comprises a second cylinder (551) mounted at the upper end of the L-shaped plate (54), the lower end of the second cylinder (551) penetrates through the L-shaped plate (54) through the output rod and is connected with a supporting frame (552), the lower end of the supporting frame (552) is connected with a base plate (553), the upper end of the base plate (553) is movably connected with two movable shafts (556) through bearings, the lower ends of the movable shafts (556) are respectively connected with a secondary ink return plate (555), one corresponding side of the secondary ink return plate (555) is respectively connected with a main ink return plate (554) through a rubber connecting belt (5512), the main ink return plates (554) are respectively connected with the base plate (553) through screws in a threaded mode, the outer sides of the movable shafts (556) are respectively sleeved with a gear (557), the outer sides of the gears (557) are respectively meshed with a toothed plate (553), one end of each toothed plate (553) is jointly connected with a push plate (559), the upper ends of the base plate (553) are respectively connected with a fourth cylinder (559), and the upper ends of the base plate (5513) are respectively connected with the fourth cylinder (559) through a fourth cylinder (5513).

6. The screen printer according to claim 4, wherein the ink scraping assembly (56) comprises a third cylinder (561) mounted at the upper end of the L-shaped plate (54), the lower end of the third cylinder (561) penetrates the L-shaped plate (54) through the output rod and is connected with a mounting plate (562), and the mounting plate (562) is in threaded connection with the scraper (563) through a screw.

7. Screen printer according to claim 1, wherein the positioning mechanism (6) comprises two positioning rods (61) arranged at the upper end of the workbench (1), the upper end of the workbench (1) is provided with a chute (8), the outer side of the workbench (1) is symmetrically provided with a moving groove (9) communicated with the chute, the lower ends of the positioning rods (61) are respectively connected with a sliding block (62) in sliding connection with the chute (8), and the sliding blocks (62) respectively pass through the moving groove (9) through threaded rods (63) and are in threaded connection with second nuts (64).

8. Screen printer according to claim 1, wherein the upper end of the workbench (1) is provided with a groove (10), the buffer mechanism (7) comprises a spring (71) arranged in the inner cavity of the groove (10), the upper end of the spring (71) is connected with a bottom plate (72), the upper end of the bottom plate (72) is adhered with a rubber plate (73), the lower end of the bottom plate (72) is connected with an outer cover (74), and the width of the outer cover (74) is matched with the width of the groove (10).