A digital printing press

Abstract

This utility model discloses a digital printing machine, including a chassis. The chassis houses a feed roller, a take-up roller, and a roller assembly for changing the direction of the paper roll. The paper roll is hung on the feed roller and conveyed to the take-up roller via the roller assembly. A first inkjet unit is positioned above the front side of the paper roll between the feed roller and the roller assembly. A second inkjet unit is positioned above the back side of the paper roll between the take-up roller and the roller assembly. A flattening assembly for leveling the paper roll is positioned between the feed roller and the first inkjet unit. A guide roller for keeping the paper roll horizontal is positioned between the take-up roller and the second inkjet unit. The chassis also houses a drying assembly for drying both sides of the paper roll. The flattening assembly flattens the paper roll, improving printing quality.

Description

Technical Field

[0001] This utility model relates to the field of printing technology, specifically to a digital printing machine. Background Technology

[0002] Digital printing presses use inkjet units to spray ink onto paper rolls. After drying and other steps, the paper rolls are rolled up. Before passing through the inkjet unit, the paper rolls need to be flattened to ensure printing quality. However, the flattening unit of traditional printing presses has a fixed position and cannot be adjusted to accommodate paper rolls of different materials or thicknesses. After printing, the paper rolls also need to be dried. Traditional drying methods are mostly single drying methods, which have low drying efficiency and are prone to incomplete drying, affecting product quality. Utility Model Content

[0003] Based on the above-mentioned problems existing in the prior art, the purpose of this utility model embodiment is to provide a digital printing machine.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a digital printing machine, including a machine housing, wherein a feed roller, a take-up roller and a roller assembly for changing the direction of the paper roll are arranged inside the machine housing. The paper roll is hung on the feed roller and conveyed to the take-up roller through the roller assembly. A first inkjet unit located above the front side of the paper roll is arranged between the feed roller and the roller assembly. A second inkjet unit located above the back side of the paper roll is arranged between the take-up roller and the roller assembly. A flattening component for flattening the paper roll is arranged between the feed roller and the first inkjet unit. A guide roller for keeping the paper roll horizontal is arranged between the take-up roller and the second inkjet unit. A drying component for drying the front and back sides of the paper roll is also arranged inside the machine housing.

[0005] Furthermore, the flattening assembly includes a lower pressure roller and an upper pressure roller movably disposed above the lower pressure roller. A movable block is disposed at both ends of the upper pressure roller along its length. The upper pressure roller is rotatably disposed between the two movable blocks. A slider is disposed above the movable blocks. A slide rod is disposed on the movable blocks and extends through the height direction of the slider. A spring is disposed between the slider and the movable blocks and sleeved on the slide rod. The housing is also equipped with a control assembly for controlling the lifting and lowering of the slider.

[0006] Furthermore, the inner wall of the chassis is provided with a slide rail that is slidably connected to the slider, and a connecting plate is provided between the two sliders. The control component includes a screw threadedly connected to the connecting plate. The screw passes through the thickness direction of the connecting plate and both ends of the screw are smooth rods. A support frame is provided inside the chassis. One end of the screw is rotatably connected to the support frame, and the other end of the screw passes through to the outside of the chassis and is connected to a handle.

[0007] Furthermore, the take-up roller is located below the feed roller, and the roller assembly includes a first roller and a second roller located below the first roller. The top surface of the first roller is flush with the top surface of the lower pressure roller, and the bottom surface of the second roller is flush with the bottom surface of the guide roller.

[0008] Furthermore, the drying assembly includes two light boxes with arc-shaped grooves on their bottom surfaces. Several ultraviolet curing lamps are installed in the arc-shaped grooves. The cross-section of the arc-shaped groove is elliptical and its surface is coated with a reflective layer. The ultraviolet curing lamps are located at the focal point of the elliptical arc.

[0009] Furthermore, the light box has several through slots extending through one side of its width direction. A flexible hose is connected to the through slot. The flexible hose passes through the housing and is connected to a fan and a heater outside the housing. The light box also has an air trough extending through its bottom surface and communicating with the through slots. The width of the air trough gradually increases from the beginning to the end of the through slot.

[0010] Furthermore, the chassis is equipped with a suction hood, which is connected to the air inlet of the fan via a pipe, and a filter is installed on the pipe.

[0011] Compared with the prior art, the beneficial effects achieved by this utility model are: the paper roll is squeezed and flattened by the upper and lower pressure rollers, the position of the upper pressure roller and the force on the paper roll are adjusted by the control component to adjust the position of the slider, so as to adapt to paper rolls of different materials and thicknesses, and the ink droplets are cured by ultraviolet curing lamp and hot air, which is highly efficient. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] In the picture:

[0014] Figure 1 This is a cross-sectional view of the present invention;

[0015] Figure 2 A schematic diagram of the structure of the light box in this utility model;

[0016] Figure 3 yes Figure 1 Enlarged diagram of point A in the diagram.

[0017] In the picture:

[0018] 1. Casing; 2. Feed roller; 3. Take-up roller; 4. First inkjet unit; 5. Second inkjet unit; 6. Guide roller; 7. First roller shaft; 8. Second roller shaft; 9. Light box; 10. Arc groove; 11. Ultraviolet curing lamp; 12. Through groove; 13. Air groove; 14. Suction hood; 15. Upper pressure roller; 16. Lower pressure roller; 17. Movable block; 18. Slider; 19. Slide rod; 20. Spring; 21. Slide rail; 22. Connecting plate; 23. Screw; 24. Support frame; 25. Paper roll. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] Please see Figure 1-3 This utility model provides a technical solution: a digital printing machine, including a chassis 1. The chassis 1 houses a feed roller 2, a take-up roller 3, and a roller assembly for changing the direction of a paper roll 25. The roller assembly changes the paper's transport direction, ensuring that both sides of the paper have upward-facing areas, facilitating printing by the inkjet unit. The paper roll 25 is hung on the feed roller 2 and transported to the take-up roller 3 via the roller assembly. A first inkjet unit 4 is positioned above the front side of the paper roll 25 between the feed roller 2 and the roller assembly. A second inkjet unit 5 is positioned above the back side of the paper roll 25 between the take-up roller 3 and the roller assembly. A flattening assembly for leveling the paper roll 25 is positioned between the feed roller 2 and the first inkjet unit 4. The flattening assembly flattens the paper roll 25... Flattening enhances the printing effect during paper printing; the machine housing 1 is also equipped with a drying component for drying both sides of the paper roll 25; the drying component accelerates the drying of ink and prevents problems such as unclear printing caused by friction between the paper and other components; a guide roller 6 is provided between the take-up roller 3 and the second inkjet unit 5 to keep the paper roll 25 horizontal. The take-up roller 3 is located below the feed roller 2. The roller assembly includes a first roller 7 and a second roller 8 located below the first roller 7. The top surface of the first roller 7 is flush with the top surface of the lower pressure roller 16, and the bottom surface of the second roller 8 is flush with the bottom surface of the guide roller 6. In this way, the paper roll 25 below the first inkjet unit 4 and the second inkjet unit 5 are both in a horizontal state, which facilitates inkjet printing and improves printing quality.

[0021] The flattening assembly includes a lower pressure roller 16 and an upper pressure roller 15 movably disposed above the lower pressure roller 16. A movable block 17 is disposed at both ends of the upper pressure roller 15 along its length. The upper pressure roller 15 is rotatably disposed between the two movable blocks 17. A slider 18 is disposed above the movable block 17. A slide rod 19 is disposed on the movable block 17, penetrating the height direction of the slider 18. A spring 20 is disposed between the slider 18 and the movable block 17 and sleeved on the slide rod 19. A control assembly for controlling the lifting and lowering of the slider 18 is also disposed inside the housing 1.

[0022] For printing materials of different materials and thicknesses, the compression of the spring 20 can be changed by adjusting the position of the slider 18, thereby adjusting the force applied by the lower pressure roller 16 to the paper roll 25. This is suitable for paper rolls 25 of different materials and thicknesses. For inkjet printing of paper rolls 25 of different materials and thicknesses, the inkjet speed and droplet size of the inkjet unit can be adjusted.

[0023] The inner wall of the chassis 1 is provided with a slide rail 21 that is slidably connected to the slider 18. A connecting plate 22 is provided between the two sliders 18. The control component includes a screw 23 that is threadedly connected to the connecting plate 22. The screw 23 passes through the thickness direction of the connecting plate 22 and both ends of the screw 23 are smooth rods. A support frame 24 is provided inside the chassis 1. One end of the screw 23 is rotatably connected to the support frame 24, and the other end of the screw 23 passes through to the outside of the chassis 1 and is connected to a handle.

[0024] Because of the restriction of the screw 23 by the support frame 24, the height position of the screw 23 remains unchanged when the screw 23 is turned by the handle, while the slider 18 is restricted by the slide rail 21 and cannot rotate. In the end, the rotation of the screw 23 causes the slider 18 to slide up and down, thereby adjusting the position of the slider 18.

[0025] The drying assembly includes two light boxes 9 with arc-shaped grooves 10 on their bottom surfaces. Several ultraviolet curing lamps 11 are installed in the arc-shaped grooves 10. The cross-section of the arc-shaped grooves 10 is elliptical and its surface is coated with a reflective layer. The ultraviolet curing lamps 11 are located at the focal point of the elliptical arc. Through the reflective layer of the elliptical arc, the ultraviolet curing lamps 11 emit light in other directions, which is reflected onto the paper roll 25 after passing through the reflective layer, thus improving the ink curing effect.

[0026] The light box 9 has several through slots 12 that run through one side of its width direction. A flexible hose is connected to the through slot 12. The flexible hose runs through the housing 1 and is connected to a fan and a heater outside the housing 1. The light box 9 has an air trough 13 that runs through its bottom surface and communicates with the through slots 12. The width of the air trough 13 gradually increases from the beginning of the through slot 12 to the end.

[0027] Hot air is blown onto the paper roll 25 through the air channel 13 by a fan and heater, which further improves the curing efficiency of the ink. The width of the air channel 13 gradually increases, which can balance the flow of hot air at each position, so that the air volume passing through each position of the paper is similar, and prevent the ink from curing incompletely in some areas of the paper.

[0028] The machine casing 1 is equipped with a suction hood 14, which is connected to the air inlet of the fan through a pipe. A filter is installed on the pipe, which can be an activated carbon filter. The suction hood 14 is connected to the fan, so that the air in the machine casing 1 is in an internal circulation state. The filter absorbs moisture and dust in the air, making the air drier and cleaner, thus improving the printing quality.

[0029] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A digital printing press characterized by: The device includes a housing, which houses a feed roller, a take-up roller, and a roller assembly for changing the direction of the paper roll. The paper roll is hung on the feed roller and conveyed to the take-up roller via the roller assembly. A first inkjet unit located above the front side of the paper roll is located between the feed roller and the roller assembly. A second inkjet unit located above the back side of the paper roll is located between the take-up roller and the roller assembly. A flattening assembly for leveling the paper roll is located between the feed roller and the first inkjet unit. A guide roller for keeping the paper roll horizontal is located between the take-up roller and the second inkjet unit. The housing also houses a drying assembly for drying both sides of the paper roll.

2. The digital printer of claim 1, characterized in that: The flattening assembly includes a lower pressure roller and an upper pressure roller movably disposed above the lower pressure roller. A movable block is disposed at both ends of the upper pressure roller along its length. The upper pressure roller is rotatably disposed between the two movable blocks. A slider is disposed above the movable blocks. A slide rod is disposed on the movable blocks and extends through the height direction of the slider. A spring is disposed between the slider and the movable blocks and sleeved on the slide rod. The machine housing also contains a control assembly for controlling the lifting and lowering of the slider.

3. The digital printer of claim 2, wherein: The inner wall of the chassis is provided with a slide rail that is slidably connected to the slider. A connecting plate is provided between the two sliders. The control component includes a screw threadedly connected to the connecting plate. The screw passes through the thickness direction of the connecting plate and both ends of the screw are smooth rods. A support frame is provided inside the chassis. One end of the screw is rotatably connected to the support frame, and the other end of the screw passes through to the outside of the chassis and is connected to a handle.

4. The digital printer of claim 1, wherein: The take-up roller is located below the feed roller. The roller assembly includes a first roller and a second roller located below the first roller. The top surface of the first roller is flush with the top surface of the lower pressure roller, and the bottom surface of the second roller is flush with the bottom surface of the guide roller.

5. The digital printer of claim 1, wherein: The drying assembly includes two light boxes with arc-shaped grooves on their bottom surfaces. Several ultraviolet curing lamps are installed in the arc-shaped grooves. The cross-section of the arc-shaped groove is elliptical and its surface is coated with a reflective layer. The ultraviolet curing lamps are located at the focal point of the elliptical arc.

6. The digital printer of claim 5, wherein: The light box has several through slots extending through one side of its width. A flexible hose is connected to the through slot. The flexible hose passes through the housing and is connected to a fan and a heater outside the housing. The light box also has an air trough extending through its bottom surface and communicating with the through slots. The width of the air trough gradually increases from the beginning to the end of the through slot.

7. The digital printer of claim 6, wherein: The chassis is equipped with a suction hood, which is connected to the air inlet of the fan via a pipe, and a filter is installed on the pipe.

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