CN115302956B

CN115302956B - Digital printer

Info

Publication number: CN115302956B
Application number: CN202210984824.1A
Authority: CN
Inventors: 徐勇强; 李芝明; 冯超勇
Original assignee: Zhejiang Puqi Digital Technology Co ltd
Current assignee: Zhejiang Puqi Digital Technology Co ltd
Priority date: 2022-08-17
Filing date: 2022-08-17
Publication date: 2023-08-29
Anticipated expiration: 2042-08-17
Also published as: CN115302956A

Abstract

The invention discloses a digital printer. The printing machine comprises a frame, wherein a printing platform is arranged on the frame, a first conveying belt for conveying plates is arranged on the printing platform along the front-back direction, a first pressing roller, a second pressing roller and a third pressing roller are arranged above the printing platform, the first pressing roller, the second pressing roller and the third pressing roller are sequentially arranged at intervals along the printing platform from front to back, the area between the second pressing roller and the third pressing roller is a printing area of the printing platform, a first lifting component for driving the first pressing roller to lift, a second lifting component for driving the second pressing roller to lift and a third lifting component for driving the third pressing roller to lift are arranged on the frame, a printing mechanism is arranged above the printing area, and a feeding mechanism for conveying plates to the first conveying belt is arranged at the front end of the frame. The invention can flatten the plate on the printing platform and ensure the accuracy of the printed pattern.

Description

Digital printer

Technical Field

The invention relates to the technical field of digital printing, in particular to a digital printing machine.

Background

Currently, digital brushing machines are widely used in the processing industry of ceramic tiles, glass, wood, boards, fabrics, and the like. In the board packaging printing industry, digital printing is gradually replacing original traditional printing, when the board of the existing digital printer is printed, when the board has the problems of edge warping or board bending and the like, the board can be misplaced, skewed and the like in the pattern during printing, and the board needs to be manually flattened and leveled, so that the labor is wasted, and the printing effect and efficiency are affected.

Disclosure of Invention

The invention aims to solve the problems that the existing printing machine cannot tidy plates and affects printing effect, and provides a digital printing machine which realizes automatic leveling of the plates and improves printing efficiency.

In order to solve the problems, the invention is realized by adopting the following technical scheme:

the invention relates to a digital printer, which comprises a frame, wherein a printing platform is arranged on the frame, a first lifting component used for driving the first pressing roller to lift, a second lifting component used for driving the second pressing roller to lift and a third lifting component used for driving the third pressing roller to lift are arranged on the printing platform along the front-back direction, a printing mechanism is arranged above the printing platform, the first pressing roller, the second pressing roller and the third pressing roller are sequentially arranged at intervals along the printing platform from front to back, the area between the second pressing roller and the third pressing roller is a printing interval of the printing platform, and a first lifting component used for driving the first pressing roller to lift, a second lifting component used for driving the second pressing roller to lift and a third lifting component used for driving the third pressing roller to lift are arranged on the frame.

In this scheme, according to the thickness of waiting to print the panel, with first swager roller, second swager roller and third swager roller adjustment to with wait to print the panel looks adaptation high, feed mechanism transmits the panel to first conveyer belt, when first conveyer belt transmission panel, first swager roller is preliminary to be pressed smooth with the panel, when the panel reaches the printing interval, second swager roller and third swager roller will be located the panel pressure that prints the region and level, guarantee the accuracy of printing the pattern.

Preferably, the first lifting component comprises two first lifting structures symmetrically arranged at two ends of the first pressing roller, the second lifting component comprises two second lifting structures symmetrically arranged at two ends of the second pressing roller, the third lifting component comprises two third lifting structures symmetrically arranged at two ends of the third pressing roller, the first lifting structures, the second lifting structures and the third lifting structures are consistent, each lifting structure comprises a lifting block, a motor for driving the lifting block to lift and a limiting block located at the outer side of the lifting block, a roll shaft of the pressing roller is connected with the lifting block in a rotating mode and penetrates out of the lifting block, a bar-shaped limiting groove is vertically formed in the limiting block, and a part of the roll shaft penetrating out of the lifting block stretches into the bar-shaped limiting groove.

Preferably, the lifting block is provided with an induction piece, the limiting block is provided with a limiting sensor, and the induction piece is positioned above the limiting sensor.

Preferably, the printing platform is provided with a first cavity, a plurality of first perforations are uniformly formed in the first conveying belt, a plurality of strip-shaped grooves are uniformly formed in the top surface of the printing platform, the strip-shaped grooves correspond to the first perforations, a plurality of first adsorption holes communicated with the first cavity are uniformly formed in the bottom surface of the strip-shaped grooves, the trend of the strip-shaped grooves is consistent with the conveying direction of the first conveying belt, a plurality of first air suction openings communicated with the first cavity are formed in the bottom surface of the printing platform side by side, the plurality of first air suction openings are equidistantly arranged, a first air suction mechanism is arranged in the rack, and the first air suction openings are connected with the first air suction mechanism through first air suction pipes. During actual operation, the first mechanism that induced drafts forms the negative pressure with the gas suction in the first cavity, and when first conveyer belt removes/is static, there is first perforation and first absorption hole intercommunication all the time, realizes inhaling the panel tightly on first conveyer belt, realizes that the panel can not rock on print platform when printing, and the panel is also inhaled on print platform simultaneously, through setting up the bar recess, has increased the adsorption affinity of print platform to the panel on the first conveyer belt.

Preferably, a plurality of partition plates are arranged in the first cavity side by side along the left-right direction, the intervals of the partition plates are consistent, the partition plates divide the first cavity into a plurality of independent adsorption cavities, the first air suction ports are in one-to-one correspondence with the independent adsorption cavities, and the first air suction ports are communicated with the corresponding independent adsorption cavities. The first air suction openings are in one-to-one correspondence with the independent adsorption cavities, and negative pressure in the independent adsorption cavities is guaranteed to be consistent.

Preferably, the frame is provided with a transfer beam, the transfer beam is provided with a second cavity, the transfer beam is provided with a plurality of through holes communicated with the second cavity, the through holes are symmetrically arranged at the left end and the right end of the transfer beam and correspond to the first air suction openings one by one, the through holes are in sealing connection with the corresponding first air suction openings through first air suction pipes, the first air suction mechanism is communicated with the second cavity through second air suction pipes, and the second air suction pipes are arranged in the middle of the transfer beam. In actual operation, the first air suction mechanism sucks out the air in the second cavity through the first air suction pipe, negative pressure is formed in the second cavity, at the moment, the negative pressure intensity of the second cavity gradually decays from the middle part to the two ends to tend to be stable, and through the arrangement of the plurality of through holes symmetrically arranged at the two ends of the transfer beam, the negative pressure at the plurality of through holes is basically consistent, the negative pressure in the first cavity is basically consistent, and the purpose that the adsorption force of the printing platform on the plate is even is achieved; specifically, the number of the partition plates is 5, the first cavity is divided into 6 independent adsorption cavities with the same size, 6 through holes are formed, each through hole is in sealing connection with the corresponding first air suction inlet through the first air suction pipe, 3 through holes are positioned at the leftmost end of the transfer beam and are mutually clung, in addition, 3 through holes are positioned at the rightmost end of the transfer beam and are mutually clung, an air suction hole is formed in the middle of the transfer beam and is connected with the second air suction pipe, the distance between the air suction hole and the nearest through hole at the left side of the air suction hole is d1, the distance between the air suction hole and the nearest through hole at the right side of the air suction hole is d2, d1=d2, and the negative pressure at the two ends of the transfer beam is ensured to be basically consistent through the arrangement of d1=d2; the 3 through holes are tightly attached to each other; the negative pressure at the three through holes is ensured to be basically consistent.

Preferably, valves are arranged on the first air suction pipes. When in actual work, the width of the plate is printed according to the requirement, and the corresponding valve is opened, so that the aim of saving the cost is fulfilled.

Preferably, the printing mechanism comprises a cross beam, a printing head arranged on the cross beam, a first driving mechanism for driving the printing head to reciprocate along the cross beam and a first lifting mechanism for driving the printing head to lift, the printing head is connected with an inking mechanism, a spray head of the printing head faces a printing section and is located right above the printing section, a moisturizing mechanism for moisturizing the spray head is arranged on one side of the frame, the moisturizing mechanism is located below the cross beam, and an incoming material sensor is arranged on the bottom surface of the cross beam. The ink adding mechanism comprises an ink barrel, an ink supply pump and an ink box, wherein the ink barrel is used for inking the ink box through the ink supply pump, and the ink box is connected with the printing head. Wherein the ink barrel is connected with the ink box and the ink box is connected with the printing head through the ink tube.

Preferably, the first lifting mechanism comprises a vertically arranged screw rod, a screw rod nut sleeved on the screw rod, a motor for driving the screw rod to rotate and a connecting plate connected with the first driving mechanism, the printing head comprises a printing frame, the motor is fixedly connected with the printing frame, a bar groove is formed in the printing frame along the vertical direction, a connecting frame is fixedly connected to the screw rod nut, the connecting frame penetrates through the bar groove and then is fixedly connected with the connecting plate, two sliding blocks are symmetrically arranged on the left side and the right side of the front side of the printing frame, two sliding rails are arranged on the connecting plate, the sliding blocks correspond to the sliding rails one by one, and the sliding blocks are arranged on the corresponding sliding rails in a sliding mode. During actual operation, the motor drives the screw rod to move up and down along the screw rod nut, and the screw rod drives the printing frame to move up and down, so that the lifting of the printing head is realized.

Preferably, the upper end of the screw rod is sleeved with a first bearing seat, the lower end of the screw rod is sleeved with a second bearing seat, the first bearing seat and the second bearing seat are fixedly connected to the printing frame, limit sensors are arranged on the first bearing seat and the second bearing seat, and trigger pieces corresponding to the limit sensors are arranged on the screw rod nuts. When in actual work, the printing head is lifted according to the preset height, namely the triggering piece moves between the two limit sensors, the printing head which works normally is not contacted with the limit sensors, and when the lifting mechanism breaks down, the triggering piece is contacted with the limit sensors, and the lifting mechanism stops working at the moment.

Preferably, the moisturizing mechanism comprises a bottom plate, a moisturizing disc is arranged on the bottom plate, a plurality of ink absorbing stacks are arranged in the moisturizing disc, moisturizing liquid is arranged in the ink absorbing stacks, a second driving mechanism for driving the moisturizing disc to move along the front and back directions of the bottom plate is arranged on the bottom plate, an ink scraping sheet is arranged at the rear end of the moisturizing disc and is positioned right behind the ink absorbing stacks, and the top ends of the ink scraping sheets are higher than the top surfaces of the ink absorbing stacks.

Preferably, the moisturizing disc is provided with an ink storage groove, the ink scraping sheet is arranged in the ink storage groove, and the ink storage groove is communicated with the ink discharge groove.

Preferably, the feeding mechanism comprises a conveying assembly and a material arranging assembly, the conveying assembly comprises a conveying platform, a plurality of second conveying belts are arranged on the conveying platform along the left and right directions at equal intervals, the rear ends of the second conveying belts are connected with the front ends of the first conveying belts, the material arranging assembly comprises a guide rod, two material arranging plates and a driving assembly, the guide rod is arranged along the left and right directions of the conveying platform, the two material arranging plates are symmetrically arranged on the guide rod, the driving assembly is used for driving the two material arranging plates to be relatively close to/far away from each other, the guide rod is provided with a material blocking assembly, the material blocking assembly comprises a material blocking plate and a mounting block, the mounting block is arranged on the guide rod, the material blocking plate is arranged on the mounting block and can slide up and down along the mounting block, the material blocking plate is positioned on the front side of the mounting block, and the mounting block is provided with an adjusting structure for adjusting the height of the material blocking plate.

Preferably, the lower end of the striker plate is connected with a pressing plate, the pressing plate is arranged in parallel relative to the belt surface of the second conveying belt, the front side of the pressing plate is provided with an upward bent folded edge, and the folded edge is positioned in front of the first pressing roller.

Preferably, the material conveying platform is provided with a third cavity, the top surface of the material conveying platform is provided with a plurality of adsorption areas along the left-right direction at equal intervals, the adsorption areas are in one-to-one correspondence with the second conveying belts, the adsorption areas are located below the corresponding second conveying belts, a plurality of second adsorption holes are uniformly formed in the adsorption areas, a plurality of second perforation holes are uniformly formed in the second conveying belts, the aperture of each second perforation hole is smaller than that of each second adsorption hole, a plurality of second air suction openings are formed in the bottom surface of the material conveying platform at intervals, the second air suction openings are communicated with the third cavity, the second air suction openings are arranged in a staggered mode with the second adsorption holes, and the second air suction openings are connected with a second air suction mechanism through third air suction pipes.

Preferably, the adjusting structure comprises an adjusting rod and a connecting plate horizontally arranged at the upper end of the striker plate, the connecting plate is located right above the mounting block, the adjusting rod is vertically arranged, the upper portion of the adjusting rod is rotationally connected with the connecting plate, threads are arranged at the lower portion of the adjusting rod, a threaded hole matched with the threads is formed in the top surface of the mounting block, a bar-shaped hole is formed in the striker plate in the vertical direction, and a limiting pin matched with the bar-shaped hole is arranged on the mounting block.

Preferably, the front of passing the material platform is equipped with holds in the palm the system mechanism, hold in the palm paper subassembly including the symmetry setting in the support of frame both sides, hold in the palm paper subassembly and include the cantilever, the cantilever level sets up and extends towards the place ahead of frame, the inboard of cantilever is equipped with the slide rail along the cantilever trend, be equipped with the slider on the slide rail, be equipped with the bearing roller that is used for supporting panel between two sliders, be equipped with the pivot between two cantilevers, the pivot is connected with the swinging rolls, swinging rolls relative pivot parallel arrangement, the one end of pivot is connected with the guiding mechanism who is used for driving pivot pivoted. By arranging the material conveying platform, the automatic feeding of the printing platform is realized; by arranging the paper supporting mechanism, the large-size plate is conveyed, and the application range of the invention is enlarged.

The beneficial effects of the invention are as follows: the first material pressing roller is arranged to realize preliminary flattening of the plate, and the second material pressing roller and the third material pressing roller are arranged to realize flattening of the plate in the printing area, so that the accuracy of the printing pattern is ensured; by arranging the first air suction mechanism, the plate is sucked on the printing platform, and the plate is sucked on the printing platform, so that the accuracy of the printed pattern is further ensured; by arranging the ink scraping sheet, the automatic cleaning of the spray head of the printing head is realized, and the use of manpower is reduced; through setting up feed mechanism, realize the sheet material to printing platform piece by piece transmission.

Drawings

FIG. 1 is a schematic diagram of a digital printer;

FIG. 2 is a schematic illustration of a print platform and a first conveyor belt;

FIG. 3 is a schematic view of a first air suction mechanism and frame;

FIG. 4 is a schematic diagram of a printing platform;

FIG. 5 is an enlarged schematic view at A in FIG. 4;

FIG. 6 is an internal schematic view of a print platform;

FIG. 7 is a schematic view of a transfer beam;

FIG. 8 is a schematic view of a cross beam and printhead;

FIG. 9 is a cross-sectional view of a printhead;

FIG. 10 is a schematic illustration of a moisturizing tray;

FIG. 11 is a cross-sectional view of a side of the moisturizing tray;

FIG. 12 is a schematic view of a loading mechanism;

FIG. 13 is a schematic view of another angle of the feed mechanism;

FIG. 14 is a schematic view of a mounting block, dam, and press plate;

FIG. 15 is a schematic view of a transfer platform and a second conveyor belt;

fig. 16 is a schematic illustration of the inking of a print head.

The reference numerals in the drawings are as follows:

1. a frame; 2. a printing platform; 3. a first conveyor belt; 4. a first nip roll; 5. a second nip roll; 6. a third nip roll; 7. printing an interval; 8. a first cavity; 9. a first perforation; 10. a strip-shaped groove; 11. a first adsorption hole; 12. a first air suction port; 13. a first air suction pipe; 14. a partition plate; 15. a transfer beam; 16. a second cavity; 17. a through hole; 18. a valve; 19. a cross beam; 20. a print head; 21. a material supply sensor; 22. a bottom plate; 23. a moisturizing tray; 24. an ink absorption stack; 25. a doctor blade; 26. a material conveying platform; 27. a second conveyor belt; 28. a guide rod; 29. a monolith plate; 30. a striker plate; 31. a mounting block; 32. a pressing plate; 33. folding edges; 34. a third cavity; 35. a second adsorption hole; 36. a second perforation; 37. a second air suction pipe; 38. a third air suction pipe; 39. an ink discharge groove; 40. an ink discharge hole; 41. printing a spray head; 42. A screw rod; 43. a screw nut; 44. a motor; 45. a first bearing seat; 46. a second bearing seat; 47. a trigger piece; 48. a limit sensor; 49. a connecting frame; 50. an air suction hole; 51. an ink barrel; 52. an ink supply pump; 53. a filter; 54. an ink cartridge; 55. a first liquid level sensor; 56. A second liquid level sensor; 57. a buffer bottle; 58. a three-way valve; 59. a positive pressure control system; 60. And a negative pressure control system.

Detailed Description

The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.

Examples: the invention discloses a digital printer, as shown in fig. 1 to 15, which comprises a frame 1, wherein a printing platform 2 is arranged on the frame 1, a first conveying belt 3 for conveying boards is arranged on the printing platform 2 along the front-back direction, a first material pressing roller 4, a second material pressing roller 5 and a third material pressing roller 6 are arranged above the printing platform 2, the first material pressing roller 4, the second material pressing roller 5 and the third material pressing roller 6 are sequentially arranged at intervals from front to back along the printing platform 2, the area between the second material pressing roller 5 and the third material pressing roller 6 is a printing area 7 of the printing platform 2, a first lifting component for driving the first material pressing roller 4 to lift, a second lifting component for driving the second material pressing roller 5 to lift and a third lifting component for driving the third material pressing roller 6 to lift are arranged on the frame 1, a printing mechanism is arranged above the printing area 7, and a feeding mechanism for conveying boards to the first conveying belt 3 is arranged at the front end of the frame 1.

In this scheme, according to the thickness of waiting to print the panel, with first swager roller 4, second swager roller 5 and third swager roller 6 adjustment to with wait to print the height of panel looks adaptation, feed mechanism is with panel transmission to first conveyer belt 3 on, when first conveyer belt 3 transmission panel, first swager roller 4 is initially pressed the flattening with the panel, when panel reached printing interval 7, second swager roller 5 and third swager roller 6 will be located the panel flattening in the printing region, guarantee prints the accuracy of pattern. The first lifting assembly, the second lifting assembly and the third lifting assembly are consistent in structure, the first lifting assembly is taken as an example in the embodiment, the first lifting assembly comprises lifting structures symmetrically arranged at two ends of the first material pressing roller 4, each lifting structure comprises a lifting block, a motor for driving the lifting block to lift and a limiting block positioned at the outer side of the lifting block, a roller shaft of the first material pressing roller 4 is rotationally connected with the lifting block and penetrates out of the lifting block, a bar-shaped limiting groove is vertically arranged on the limiting block, the part of the roller shaft penetrating out of the lifting block stretches into the bar-shaped limiting groove, an induction piece is arranged on the lifting block, a limiting sensor is arranged on the limiting block, the induction piece is positioned above the limiting sensor, the induction piece is connected with the limiting sensor during operation, and the induction piece is positioned at the lowest position at the moment; according to the thickness input given value of the plate, controlling a lifting motor to drive a lifting block to drive a first pressing roller 4 to lift; by providing the limit groove, the lifting range of the lifting block, namely the lifting range of the first pressing roller 4 is limited. In this embodiment, first lifting component includes two symmetries and sets up the first elevation structure at first swager roller both ends, the second lifting component includes two symmetries and sets up the second elevation structure at second swager roller both ends, the third lifting component includes two symmetries and sets up the third elevation structure at third swager roller both ends, first elevation structure, second elevation structure and third elevation structure are unanimous, all include the lifter, be used for driving the motor that the lifter goes up and down and be located the stopper in the lifter outside, the roller and the lifter that the lifter was rotated to be connected and wear out to the roller of swager roller, vertically be equipped with bar spacing groove on the stopper, the part that the roller worn out the lifter stretches into in the bar spacing groove, be equipped with the response piece on the lifter, be equipped with limit sensor on the stopper, the response piece is located limit sensor's top. The first conveying belt 3 is arranged on the frame through the driving roller and the driven roller, one side of the frame is provided with a tensioning mechanism, the tensioning mechanism is connected with the driven roller, and the tensioning mechanism is used for driving the driven roller to be far away from/close to the driving roller, so that the tensioning degree of the first conveying belt is adjusted.

As shown in fig. 4 to 6, the printing platform 2 has a first cavity 8, a plurality of first perforations 9 are uniformly arranged on the first conveying belt 3, a plurality of strip-shaped grooves 10 are uniformly arranged on the top surface of the printing platform 2, the strip-shaped grooves 10 correspond to the first perforations 9, a plurality of first adsorption holes 11 communicated with the first cavity 8 are uniformly arranged on the bottom surface of the strip-shaped grooves 10, the trend of the strip-shaped grooves 10 is consistent with the conveying direction of the first conveying belt 3, a plurality of first air suction openings 12 communicated with the first cavity 8 are arranged on the bottom surface of the printing platform 2 side by side, a plurality of first air suction openings 12 are equidistantly arranged on the rack 1, a first air suction mechanism is arranged on the rack 1, the first air suction openings 12 are connected with the first air suction mechanism through a first air suction pipe 13, and concretely, a plurality of partition plates 14 are arranged in the first cavity 8 along the front-back direction, the partition plates 14 are consistent in distance, the first cavity 8 are divided into a plurality of independent adsorption cavities, the first air suction openings 12 correspond to the independent adsorption cavities 12, a plurality of the independent adsorption cavities are arranged on the rack 1, a transfer beam 15 is arranged on the rack 1, a plurality of transfer beam 15 are arranged on the rack 15 and correspond to the first air suction openings 16, the first air suction openings 17 are connected with the first air suction mechanism through the first air suction openings 17 through the first air suction mechanism through the first air suction openings 13, and the first air suction opening mechanism through the first transfer beam 17. The through holes 17 are symmetrically distributed at two ends of the transfer beam 15, and the second air suction pipe 37 is connected to the middle part of the transfer beam 15. During actual operation, the first air suction mechanism sucks out the gas in the first cavity 8, negative pressure is formed in the first cavity 8, when the first conveying belt 3 moves/is stationary, the first perforation 9 is communicated with the first adsorption hole 11 all the time, the plate is sucked and tightly fixed on the first conveying belt 3, the plate is guaranteed not to shake on the printing platform 2 during printing, meanwhile, the plate is sucked and leveled on the printing platform 2, and specifically, the distances among a plurality of air suction openings are consistent, and negative pressure in a plurality of independent adsorption cavities is guaranteed to be consistent, so that the suction of the printing platform 2 to the plate is evenly distributed. In addition, the width of the plate is printed according to the requirement, and the corresponding valve 18 is opened, so that the aim of saving cost is fulfilled; by providing the strip-shaped groove 10, the adsorption force of the printing platform 2 to the plate on the first conveying belt 3 is increased. It should be noted that, the second air suction pipe 37 sucks out the air in the second cavity 16, and negative pressure is formed in the second cavity 16, at this time, the negative pressure in the position, close to the second air suction pipe 37, in the second cavity 16 is stronger, and the plurality of through holes 17 are symmetrically distributed at two ends of the transfer beam 15, so that the negative pressure at the positions of the plurality of through holes 17 is basically consistent, and the adsorption force of the printing platform 2 on the board is ensured to be uniform. In this embodiment, the number of the partition plates is 5, the first cavity is divided into 6 independent adsorption cavities with the same size, the number of the through holes is 6, each through hole 17 is in sealing connection with the corresponding first air suction inlet through the first air suction pipe, wherein 3 through holes 17 are positioned at the leftmost end of the transfer beam 15 and are mutually clung, in addition, 3 through holes 17 are positioned at the rightmost end of the transfer beam 15 and are mutually clung, an air suction hole 50 is arranged in the middle of the transfer beam 15, the air suction hole 50 is connected with the second air suction pipe, the distance between the air suction hole 50 and the nearest through hole on the left side is d1, the distance between the air suction hole 50 and the nearest through hole 17 on the right side is d2, d1=d2, and by setting d1=d2, the negative pressures at the two ends of the transfer beam 15 are ensured to be basically consistent; by arranging 3 through holes 17, the two through holes are tightly attached to each other; the negative pressure at the three through holes 17 is ensured to be substantially uniform.

As shown in fig. 8 to 11, the printing mechanism comprises a cross beam 19, a printing head 20 arranged on the cross beam 19, a first driving mechanism for driving the printing head 20 to reciprocate along the cross beam 19, and a first lifting mechanism for driving the printing head 20 to lift, wherein the printing head 20 is connected with an ink adding mechanism, a spray head of the printing head 20 faces the printing section 7 and is positioned right above the printing section 7, one side of the frame 1 is provided with a moisturizing mechanism for moisturizing the spray head, the moisturizing mechanism is positioned below the cross beam 19, the bottom surface of the cross beam 19 is provided with a feed sensor 21, the moisturizing mechanism comprises a bottom plate 22, the bottom plate 22 is provided with a moisturizing disc 23, a plurality of ink absorbing stacks 24 are arranged in the moisturizing disc 23, a plurality of ink absorbing stacks 24 are arranged in two rows, moisturizing liquid is arranged in the ink absorbing stacks 24, a second driving mechanism for driving the moisturizing disc 23 to move along the front and back directions of the bottom plate 22 is arranged on the bottom plate 22, the rear end of the moisturizing disc 23 is provided with a scraping disc 25, the scraping disc 25 is positioned right behind the ink absorbing stacks 24, the top end of the scraping disc 25 is higher than the top surface 24 of the ink absorbing stacks 24, the moisturizing disc is positioned below the cross beam 19, the bottom surface of the scraping disc is provided with a plurality of ink absorbing stacks 39, the ink absorbing discs 39 are arranged in the ink absorbing channels 39 are arranged in the bottom surface of the printing head and are in the bottom surface of the printing disc, the ink absorbing disc is in the ink channel and are in communication with the ink absorbing channels of the ink channels of the printing disc 20, and the ink absorbing disc 39 are in the ink channels are in the ink absorbing channels, and the ink channels are in communication with the ink channels of the ink absorbing channels, and the ink channels are in the ink channels, and the channels are in the channels are connected with the ink channels, and the channels are connected with the channels, and the channels are connected respectively, and respectively. Before printing, the nozzle of the printing spray head 41 is contacted with the sponge block, the ink sprayed by the printing spray head 41 enters the groove, the ink washes the sponge block, then enters the ink guide groove from the ink discharge channel, then enters the ink discharge groove 39 from the ink guide groove, and finally flows out of the moisturizing tray 23 from the ink discharge holes 40 in the ink discharge groove 39. In the above process, the printing nozzles 41 are in one-to-one correspondence with the ink absorbing stacks 24, so that color cross between different printing nozzles 41 is avoided. By arranging the sealing rubber ring, the tightness between the printing nozzle 41 and the ink absorption stack 24 is ensured; the sponge has excellent water absorption, is easy to store the moisturizing liquid, and achieves the aim of moisturizing the printing nozzle 41 for a long time. When the printing spray head needs to be scraped, the printing spray head is driven to be right above the ink absorption stack 24, the second driving mechanism is started, the moisturizing disc 23 drives the scraping sheet 25 to move forwards until the upper end of the scraping sheet 25 is scraped by the nozzle of the printing spray head 41, at the moment, ink at the nozzle flows into the moisturizing disc 23 along the scraping sheet 25, then the printing spray head 41 is removed, and finally the second driving mechanism drives the moisturizing disc 23 to reset, and in addition, the scraping sheet 25 can repeatedly scrape ink on the printing spray head 41; when the incoming material induction sensor detects the plate conveyed below the beam 19, an instruction is sent to the printing head 20, and the printing head 20 prints the plate; limit switches are symmetrically arranged at two ends of the cross beam 19, in actual operation, the printing head prints according to the preset width, namely, the printing head reciprocates between the two limit switches, the limit switches cannot be triggered by the printing head in normal operation, and when the printing head 20 breaks down and moves to the limit switches to contact, the second driving mechanism is closed by the limit switches.

The lifting mechanism comprises a vertically arranged screw rod 42, a screw rod nut 43 sleeved on the screw rod 42, a motor 44 for driving the screw rod 42 to rotate and a connecting plate connected with the second driving mechanism, wherein the motor 44 is fixedly connected with a printing frame, a bar-shaped groove is formed in the printing frame along the vertical direction, a connecting frame 49 is fixedly connected to the screw rod nut 43, the connecting frame 49 penetrates through the bar-shaped groove and then is fixedly connected with the connecting plate, two sliding blocks are symmetrically arranged on the front side of the printing frame left and right, two sliding rails are arranged on the connecting plate, the sliding blocks are in one-to-one correspondence with the sliding rails, the sliding blocks are arranged on the corresponding sliding rails in a sliding manner, a first bearing seat 45 is sleeved on the upper end of the screw rod 42, a second bearing seat 46 is sleeved on the lower end of the screw rod 42, the first bearing seat 45 and the second bearing seat 46 are fixedly connected to the printing frame, limit sensors 48 are respectively arranged on the first bearing seat 45 and the second bearing seat 46, and trigger pieces 47 corresponding to the limit sensors 48 are respectively arranged on the screw rod nut 43. In actual operation, the motor 44 drives the screw rod 42 to move up and down along the screw rod nut 43, and the screw rod 42 drives the printing frame to move up and down, so that the lifting of the printing head is realized. Specifically, the print head is lifted according to a predetermined height, that is, the trigger piece 47 moves between the two limit sensors 48, the print head which works normally, the trigger piece 47 is not contacted with the limit sensors 48, when the lifting mechanism breaks down, the trigger piece 47 is contacted with the limit sensors 48, and the lifting mechanism stops working at the moment.

As shown in fig. 16, the ink adding mechanism includes an ink tank 51, an ink supply pump 52 and an ink cartridge 54, the ink tank 51 inks the ink cartridge 54 by the ink supply pump 52, the ink cartridge 54 is connected with a print head, a first level sensor 55 is provided in the ink cartridge 54, and the first level sensor 55 is electrically connected with the ink supply pump 52. When the first level sensor 55 senses that the ink in the ink box 54 reaches a low level, a signal is sent to the ink supply pump 52, the ink in the ink barrel 51 is pumped into the ink box 54 by the ink supply pump 52, and when the ink level in the ink box 54 is higher and higher until the ink level reaches a high level, the first level sensor 55 is triggered again, and the first level sensor 55 sends a signal to the ink supply pump 52 to supply the ink; the print head is connected with the ink tank 54 through an ink tube, when the print head 41 is at rest, the ink tank 54 is kept in a negative pressure state, the ink in the ink tank 54 cannot ink the print head 41, when the print head 41 is printing, the ink tank 54 is switched to a positive pressure state, and the ink in the ink tank 54 enters the print head from the ink tube and is pressed out from the nozzle of the print head. In the present embodiment, a filter 53 is provided between the ink cartridge 54 and the ink supply pump 52. By providing the filter 53, clogging of the printing head with ink is reduced.

The ink box 54 is connected with the buffer bottle 57 through a first air pipe, the buffer bottle 57 is connected with the positive pressure control system 59 and the negative pressure control system 60 through a three-way valve 58, the three-way valve 58 comprises a first interface, a second interface and a third interface, the first interface is connected with the buffer bottle 57 through the second air pipe, the second interface is connected with the positive pressure control system 59 through the third air pipe, the third interface is connected with the negative pressure control system 60 through a fourth air pipe, a second liquid level sensor 56 is arranged in the buffer bottle 57, the second liquid level sensor 56 is electrically connected with the ink supply pump 52, the positive pressure control system 59 keeps the ink box 54 at positive pressure through the third air pipe, and the negative pressure control system 60 keeps the ink box 54 at negative pressure through the fourth air pipe; in the positive pressure state, the ink tank 54 supplies ink to the printing head 41, and in the negative pressure state, the ink tank 54 sucks ink into the ink tank 54; by arranging the buffer bottle 57, the ink in the ink box 54 is prevented from flowing back to the negative pressure control system 60, specifically, when the ink in the ink box 54 is excessively accumulated and flows into the buffer bottle 57 through the first air pipe, the second liquid level sensor 56 in the buffer bottle 57 senses a signal and feeds back the signal to the ink supply pump 52, the ink supply pump 52 stops working, and meanwhile, the positive pressure control system 59 stops providing positive pressure to the buffer bottle 57; finally, the ink stored in the buffer bottle 57 is manually discharged, and the trouble is removed.

As shown in fig. 12 to 15, the feeding mechanism includes a conveying assembly and a monolith assembly, the conveying assembly includes a conveying platform 26, a plurality of second conveying belts 27 are equidistantly arranged on the conveying platform 26 along the left-right direction, the rear ends of the second conveying belts 27 are connected with the front ends of the first conveying belts 3, the monolith assembly includes a guide rod 28 arranged along the left-right direction of the conveying platform 26, two monolith plates 29 symmetrically arranged on the guide rod 28 and a driving assembly for driving the two monolith plates 29 to be relatively close to/far away from each other, the guide rod 28 is provided with a material blocking assembly, the material blocking assembly includes a material blocking plate 30 and a mounting block 31, the mounting block 31 is arranged on the guide rod 28, the material blocking plate 30 is arranged on the mounting block 31 and can slide up and down along the mounting block 31, the rear ends of the material blocking plate 30 are connected with a material pressing plate 32, the material blocking plate 32 is arranged in parallel to the belt surface of the second conveying belts 27, the rear sides of the material blocking plate 32 are provided with folded edges and the folded edges 33 are located in front of the first folded edges 33. In the embodiment, the second conveying belt 27 conveys the stacked plates onto the first conveying belt 3 one by one, in the process of conveying the plates, the two monolith plates 29 clamp the stacked plates, the plates are kept neat in the conveying process, the baffle plate 30 and the second conveying belt 27 have a gap, the width of the gap is larger than the thickness of the Yu Shanzhang plates and smaller than the thickness of the two plates, the single output of one plate is ensured, and the purpose of conveying plates with different thicknesses is achieved by setting an adjusting structure to change the distance of the gap; by arranging the material pressing plate 32, the stability of the plate in the process of transmission is ensured; by providing the folded edge 33 bent upward at the front side of the pressing plate 32, the plate is conveniently transferred to the lower side of the pressing plate 32.

The material conveying platform 26 is provided with a third cavity 34, the top surface of the material conveying platform 26 is provided with a plurality of adsorption areas along the left-right direction at equal intervals, the adsorption areas are in one-to-one correspondence with the second conveying belts 27, the adsorption areas are located below the corresponding second conveying belts 27, a plurality of second adsorption holes 35 are uniformly formed in the adsorption areas, a plurality of second perforation holes 36 are uniformly formed in the second conveying belts 27, the aperture of each second perforation hole 36 is smaller than that of each second adsorption hole 35, a plurality of second air suction openings are formed in the bottom surface of the material conveying platform at intervals, the second air suction openings are communicated with the third cavity 34, the second air suction openings are staggered with the second adsorption holes 35, and the second air suction openings are connected with a second air suction mechanism through third air suction pipes 38. In actual operation, the second air suction mechanism sucks out the air in the third cavity 34, negative pressure is formed in the third cavity 34, and when the second conveying belt 27 moves, the through holes are communicated with the adsorption holes all the time, so that the plate is sucked on the second conveying belt 27; in addition, when the second conveying belt 27 conveys the plate material to the first conveying belt 3, the first material pressing roller 4 is convenient to press the plate material; the second air suction port and the second adsorption hole 35 are arranged in a staggered manner, so that the third air suction pipe 38 is prevented from blocking the second conveying belt 27. In this embodiment, the place ahead of passing material platform 26 is equipped with holds in the palm system mechanism, holds in the palm paper subassembly including the symmetry setting in the support paper subassembly of frame 1 both sides, holds in the palm paper subassembly and includes the cantilever, the cantilever level sets up and extends towards the place ahead of frame 1, the inboard of cantilever is equipped with the slide rail along the cantilever trend, be equipped with the slider on the slide rail, be equipped with the bearing roller that is used for supporting panel between two sliders, be equipped with the pivot between two cantilevers, the pivot is connected with the swinging rolls, the relative pivot parallel arrangement of swinging rolls, the one end of pivot is connected with the guiding mechanism that is used for driving pivot pivoted. By arranging the material conveying platform 26, the automatic feeding of the printing platform 2 is realized; by arranging the paper supporting mechanism, the large-size plate is conveyed, and the application range of the invention is enlarged.

The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention, directly or indirectly, are included in the scope of the present invention.

Claims

1. The digital printer comprises a frame (1), and is characterized in that a printing platform (2) is arranged on the frame (1), a first conveying belt (3) for conveying plates is arranged on the printing platform (2) along the front-back direction, a first material pressing roller (4), a second material pressing roller (5) and a third material pressing roller (6) are arranged above the printing platform (2), the first material pressing roller (4), the second material pressing roller (5) and the third material pressing roller (6) are sequentially arranged at intervals along the printing platform (2) from front to back, a printing section (7) of the printing platform (2) is arranged in an area between the second material pressing roller (5) and the third material pressing roller (6), a first lifting assembly for driving the first material pressing roller (4) to lift, a second lifting assembly for driving the second material pressing roller (5) to lift and a third lifting assembly for driving the third material pressing roller (6) to lift are arranged on the frame (1), and a first lifting assembly for driving the third material pressing roller (6) to lift is arranged above the printing mechanism (7) and is arranged at the front end of the printing platform (3);

the feeding mechanism comprises a conveying assembly and a material arranging assembly, the conveying assembly comprises a conveying platform (26), a plurality of second conveying belts (27) are arranged on the conveying platform (26) at equal intervals along the left-right direction, the rear ends of the second conveying belts (27) are connected with the front ends of the first conveying belts (3), the material arranging assembly comprises guide rods (28) arranged along the left-right direction of the conveying platform (26), two material arranging plates (29) symmetrically arranged on the guide rods (28) and a driving assembly for driving the two material arranging plates (29) to be relatively close to/far away from, the guide rods (28) are provided with material blocking assemblies, the material blocking assemblies comprise material blocking plates (30) and mounting blocks (31), the mounting blocks (31) are arranged on the guide rods (28), the material blocking plates (30) are arranged on the mounting blocks (31) and can slide up and down along the mounting blocks (31), the material blocking plates (30) are arranged on the front sides of the mounting blocks (31), and the mounting blocks (31) are provided with material blocking plates (30) for adjusting height structures;

the dam plate and the second conveying belt are provided with a gap, the width of the gap is larger than the thickness of the Yu Shanzhang plates and smaller than the thickness of the two plates, and the two monolith plates are used for clamping the stacked plates;

the lower end of the striker plate (30) is connected with a pressing plate (32), the pressing plate (32) is arranged in parallel relative to the belt surface of the second conveying belt (27), a folded edge (33) which is bent upwards is arranged at the rear side of the pressing plate (32), and the folded edge (33) is positioned in front of the first pressing roller (4);

the material conveying platform (26) is provided with a third cavity (34), a plurality of adsorption areas are arranged on the top surface of the material conveying platform (26) along the left-right direction at equal intervals, the adsorption areas are in one-to-one correspondence with the second conveying belts (27), the adsorption areas are located below the corresponding second conveying belts (27), a plurality of second adsorption holes (35) are uniformly formed in the adsorption areas, a plurality of second perforation holes (36) are uniformly formed in the second conveying belts (27), the aperture of each second perforation hole (36) is smaller than that of each second adsorption hole (35), a plurality of second air suction openings are formed in the bottom surface of the material conveying platform (26) at intervals, the second air suction openings and the second adsorption holes (35) are all communicated with the third cavity (34), the second air suction openings are arranged in a staggered mode with the second adsorption holes (35), and the second air suction openings are connected with a second air suction mechanism through third air suction pipes (38).

2. The digital printer according to claim 1, wherein the printing platform (2) is provided with a first cavity (8), a plurality of first perforations (9) are uniformly arranged on the first conveying belt (3), a plurality of strip-shaped grooves (10) are uniformly arranged on the top surface of the printing platform (2), the strip-shaped grooves (10) correspond to the first perforations (9), a plurality of first adsorption holes (11) communicated with the first cavity (8) are uniformly arranged on the bottom surface of the strip-shaped grooves (10), the trend of the strip-shaped grooves (10) is consistent with the conveying direction of the first conveying belt (3), a plurality of first air suction openings (12) communicated with the first cavity (8) are arranged on the bottom surface of the printing platform (2) side by side, the plurality of first air suction openings (12) are equidistantly arranged, a first air suction mechanism is arranged on the rack (1), and the first air suction openings (12) are connected with the first air suction mechanism through the first air suction pipes (13).

3. The digital printer according to claim 2, wherein a plurality of separators (14) are arranged in the first cavity (8) side by side along the left-right direction, the intervals of the separators (14) are consistent, the plurality of separators (14) divide the first cavity (8) into a plurality of independent adsorption cavities, the first air suction ports (12) are in one-to-one correspondence with the independent adsorption cavities, and the first air suction ports (12) are communicated with the corresponding independent adsorption cavities.

4. A digital printer according to claim 2 or 3, wherein the frame (1) is provided with a transfer beam (15), the transfer beam (15) is provided with a second cavity (16), the transfer beam (15) is provided with a plurality of through holes (17) communicated with the second cavity (16), the through holes (17) are symmetrically arranged at the left end and the right end of the transfer beam (15), the through holes (17) are in one-to-one correspondence with the first air suction openings (12), the through holes (17) are in sealing connection with the corresponding first air suction openings (12) through the first air suction pipes (13), the first air suction mechanism is communicated with the second cavity (16) through a second air suction pipe (37), and the second air suction pipe is arranged in the middle of the transfer beam (15).

5. A digital printer according to claim 2 or 3, wherein the first suction pipes (13) are each provided with a valve (18).

6. A digital printer according to claim 1, 2 or 3, characterized in that the printing mechanism comprises a beam (19), a printing head (20) arranged on the beam (19), a first driving mechanism for driving the printing head (20) to reciprocate along the beam (19) and a first lifting mechanism for driving the printing head (20) to lift, the beam (19) is arranged along the left and right directions of the frame (1), the printing head (20) is connected with an inking mechanism, a spray head of the printing head (20) faces the printing section (7) and is positioned right above the printing section (7), a moisturizing mechanism for moisturizing the spray head is arranged on one side of the frame (1), the moisturizing mechanism is positioned below the beam (19), and an incoming material sensor (21) is arranged at the bottom of the beam (19).

7. The digital printer according to claim 6, wherein the moisturizing mechanism comprises a bottom plate (22), a moisturizing disc (23) is arranged on the bottom plate (22), a plurality of ink absorbing stacks (24) are arranged in the moisturizing disc (23), moisturizing liquid is arranged in the ink absorbing stacks (24), a second driving mechanism for driving the moisturizing disc (23) to move along the front and back directions of the bottom plate (22) is arranged on the bottom plate (22), a scraping sheet (25) is arranged at the rear end of the moisturizing disc (23), the scraping sheet (25) is positioned right behind the ink absorbing stacks (24), and the top ends of the scraping sheets (25) are higher than the top surfaces of the ink absorbing stacks (24).