Fan-type digital printing unit for web printing

Abstract

The present invention relates to the field of packaging printing technology, specifically a folding fan type digital printing unit for web printing, comprising a frame, an ink cartridge, a folding fan type inkjet trolley group, a trolley drive mechanism and a lifting mechanism, wherein a plurality of printing guide rollers, a paper feed guide roller and a paper discharge guide roller are rotatably connected to the inner side of the frame; a guide rail is provided on the top of the frame, the folding fan type inkjet trolley group is slidably mounted on the guide rail, the trolley drive mechanism is connected between the frame and the folding fan type inkjet trolley group, the folding fan type inkjet trolley group comprises a plurality of groups of inkjet trolleys, the plurality of groups of inkjet trolleys are arranged in a fan shape, and a nozzle is provided at the bottom of each group of inkjet trolleys; the ink cartridge is connected to the top of the lifting mechanism, the initial position of the folding fan type inkjet trolley group is located directly above the ink cartridge, and the nozzles of each group of inkjet trolleys extend into the ink cartridge. The above-mentioned folding fan type digital printing unit provided by the present invention is easy to operate, has a simple structure, is convenient for cleaning and maintaining the nozzles, and avoids clogging of the nozzles of the nozzles.

Description

Technical Field

[0001] The invention relates to the technical field of packaging printing, in particular to a folding fan type digital printing unit for web printing. Background Art

[0002] Digital printing is the digitization of printing technology, broadly referring to the partial or complete digitization of the entire process. Digital inkjet printing equipment uses a non-contact printing method. The nozzles of the printhead selectively spray ink onto the substrate at a specific speed. The interaction between the ink and the substrate forms a stable image on the substrate. To achieve sufficiently high print density and resolution, as well as a certain retention rate, the ink must have a sufficiently fast drying speed. Therefore, if the printhead is not capped promptly when not in use, the ink remaining on the printhead surface can easily dry out, causing nozzle blockage and inconvenience in equipment maintenance and production. Summary of the Invention

[0003] The purpose of the present invention is to provide a folding fan type digital printing unit for web printing in order to solve the above problems.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a folding fan type digital printing unit for web printing, comprising a frame, an ink cartridge, a folding fan type inkjet printing trolley group, a trolley driving mechanism and a lifting mechanism, a plurality of printing guide rollers, a paper feed guide roller and a paper discharge guide roller are rotatably connected to the inner side of the frame, and the paper to be printed is wound on the plurality of printing guide rollers; a guide rail is provided on the top of the frame, the folding fan type inkjet printing trolley group is slidably mounted on the guide rail, and the trolley driving mechanism is connected between the frame and the folding fan type inkjet printing trolley group, and is used to drive the folding fan type inkjet printing trolley group to slide left and right along the guide rail. The fan-shaped printing trolley group includes multiple groups of printing trolleys, which are arranged in a fan shape, and a nozzle is provided at the bottom of each group of printing trolleys; the lifting mechanism is provided on the outside of the frame, and the ink cartridge is connected to the top of the lifting mechanism. The initial position of the fan-shaped printing trolley group is directly above the ink cartridge, and the nozzle of each group of printing trolleys extends into the ink cartridge; the trolley driving mechanism drives the printing trolley to move along the guide rail, enters the area where the paper roll to be printed is located, and prints the paper roll; after printing is completed, the trolley driving mechanism drives the printing trolley to move along the guide rail, so that the fan-shaped printing trolley group returns to its initial position.

[0005] On the basis of the above technical solution, the present invention can also be improved as follows:

[0006] Furthermore, the frame includes two wall panels, which are vertically arranged on the left and right sides. The multiple printing guide rollers, paper feed guide rollers and paper discharge guide rollers are rotatably connected between the two wall panels. Each wall panel is provided with a through guide hole for the printing carriage to pass through. The through guide holes of the two wall panels are aligned in the left-right direction, and the lower edge of the through guide hole is an arc shape with the middle higher and the two sides lower.

[0007] Furthermore, the frame also includes a printing platform arranged between the two wall panels, and the printing platform includes a plurality of cross bars connected between the two wall panels. The plurality of cross bars are arranged in an arc shape along the front-to-back direction and are equidistant from each other. The cross section of each cross bar is square, and the surface of the printing platform formed by the plurality of cross bars is high in the middle and low on both sides.

[0008] Furthermore, the multiple printing guide rollers are arranged in an arc shape along the front-to-back direction and are equidistant from each other. The arc formed by the multiple printing guide rollers is higher in the middle and lower on both sides. The multiple printing guide rollers are staggered with the multiple cross bars. A printing guide roller is provided between two adjacent cross bars, and the printing guide roller protrudes upward from the surface of the cross bar.

[0009] Furthermore, the frame also includes a support plate arranged on the top of the two wall panels. The support plate is a box plate structure formed by welding multiple beams as a whole. The support plate is arranged horizontally. The support plate passes through the through guide holes of the two wall panels from right to left. The support plate is connected and fixed to the two wall panels by screws. The upper surface of the support plate abuts the upper edge of the through guide holes of the two wall panels. The bottom of the support plate is provided with the guide rail along its length direction.

[0010] Furthermore, two side plates are fixed at both ends of the support plate by screw connection, and the trolley drive mechanism is arranged between the two side plates. The trolley drive mechanism is a plurality of magnetically coupled rodless cylinders installed between the two side plates, and the sliding magnets of the magnetically coupled rodless cylinders are installed and fixed to the top of the folding fan type printing trolley group.

[0011] Furthermore, the frame also includes a support frame arranged on the outside of one of the wall panels, a portion of the support plate extends to the outside of the wall panel and is located directly above the support frame, the lifting mechanism is arranged between the support frame and the ink cartridge, the lifting mechanism includes four spiral elevators installed on the support frame, two commutators and a lifting reducer, a lifting connecting rod connected between the spiral elevators, a reduction connecting rod connected between the lifting reducer and the commutator, and a lifting motor fixed to the lifting reducer, and the four spiral elevators are correspondingly connected to the bottom of the ink cartridge.

[0012] Furthermore, the tops of the multiple groups of printing carriages are connected and fixed to the sliding magnets of the multiple magnetically coupled rodless cylinders. Each group of printing carriages also includes two sliding side panels, a box sandwiched between the two sliding side panels, and a control circuit board installed on one side of the box. The nozzles are installed at the bottom of the box, and the tops of the sliding side panels are slidably installed on the guide rails and are connected and fixed to the sliding magnets of the magnetically coupled rodless cylinders.

[0013] Furthermore, the bottom surface of the box body is a printing surface, and the multiple nozzles are arranged on the printing surface. The printing surfaces of the multiple groups of printing vehicles are arranged into an arc surface, which is high in the middle and low on both sides.

[0014] The beneficial effects of the present invention are as follows: the above-mentioned folding fan type digital printing unit provided by the present invention is convenient for moving the folding fan type printing trolley group to a suitable position in the area where the paper roll to be printed is located to print the paper roll by setting a trolley driving mechanism connected between the frame and the ink cartridge and a lifting mechanism connected between the frame and the ink cartridge, and after the printing is completed, the folding fan type printing trolley group automatically returns to the initial position, and the lifting mechanism drives the ink cartridge to rise, so that the nozzle extends into the groove of the ink cartridge, so that the waste ink on the nozzle is received by the ink cartridge, and the waste ink is collected and processed centrally. Therefore, the above-mentioned folding fan type digital printing unit provided by the present invention is easy to operate, simple in structure, convenient for cleaning and maintenance of the nozzle, and avoids clogging of the nozzle of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and examples.

[0016] Figure 1 This is a structural schematic diagram of a fan-shaped digital printing unit for web printing provided by a preferred embodiment of the present invention;

[0017] Figure 2 yes Figure 1 The front view of the folding fan digital printing unit;

[0018] Figure 3 yes Figure 1 Left side view of the fan-folding digital printing unit;

[0019] Figure 4 yes Figure 1 A top view of the fan-shaped digital printing unit;

[0020] Figure 5 yes Figure 1 A schematic diagram of the structure of the folding fan type printing carriage group and the carriage drive mechanism;

[0021] In the figure: 12, wall panel; 14, cross bar; 120, through guide hole; 15, support plate; 151, side panel; 152, guide rail; 16, support frame; 21, printing guide roller; 22, paper feed guide roller; 23, paper discharge guide roller; 30, ink cartridge; 40, magnetically coupled rodless cylinder; 42, sliding magnet; 50, folding fan type printing trolley group; 51, drag chain; 52, printing trolley; 520, printing surface; 521, sliding side panel; 522, box; 523, print head; 524, control circuit board; 525, inspection window; 526, observation window; 60, lifting mechanism; 61, screw lift; 62, commutator; 63, lifting connecting rod; 64, coupling; 65, lifting reducer; 66, lifting motor; 67, reduction connecting rod; 70, paper roll. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] like Figures 1 to 5As shown, a preferred embodiment of the present invention provides a folding fan type digital printing unit for web printing, including a frame, an ink cartridge 30, a folding fan type printing trolley group 50, a trolley driving mechanism connected between the frame and the ink cartridge 30, and a lifting mechanism 60 connected between the frame and the ink cartridge 30.

[0026] The frame includes two wall panels 12 , a printing platform disposed between the two wall panels 12 , a support plate 15 disposed on top of the two wall panels 12 , and a support frame 16 disposed on the outside of one of the wall panels 12 .

[0027] The two wall panels 12 are vertically arranged on the left and right sides, and each wall panel 12 is provided with a through guide hole 120. The through guide holes 120 of the two wall panels 12 are aligned in the left-right direction, and the lower edge of the through guide hole 120 is in an arc shape with a high middle and low sides.

[0028] The support plate 15 is a box-plate structure formed by integrally welding multiple crossbeams. The support plate 15 is arranged horizontally, extending from right to left through the through-guide holes 120 of the two wall panels 12. The support plate 15 is fixed to the two wall panels 12 via screws, with the upper surface of the support plate 15 abutting the upper edges of the through-guide holes 120 of the two wall panels 12. A portion of the support plate 15 extends beyond the wall panels 12 and is positioned directly above the support frame 16. A guide rail 152 is provided along the bottom of the support plate 15 along its length. Two side panels 151 are fixed to the ends of the support plate 15 via screws. The trolley drive mechanism is disposed between the two side panels 151. The top of the folding fan-type inkjet printing trolley assembly 50 is slidably mounted on the guide rail 152 and connected to the trolley drive mechanism. The folding fan-type inkjet printing trolley assembly 50 is driven by the trolley drive mechanism to move left and right along the guide rail 152. In this embodiment, the carriage driving mechanism is a plurality of magnetically coupled rodless cylinders 40 installed between the two side plates 151 , and the sliding magnets 42 of the magnetically coupled rodless cylinders 40 are fixed to the top of the folding fan type printing carriage group 50 .

[0029] Preferably, a drag chain 51 is connected between the side panel 151 on the left and the folding fan type printing trolley group 50. The drag chain 51 moves along with the printing trolley group 50. Lines and pipelines are arranged inside the drag chain 51 to protect the internal lines and pipelines.

[0030] The printing platform is used to flatten the paper roll 70 to ensure printing accuracy; the printing platform includes a plurality of cross bars 14 connected between two wall panels 12, and the plurality of cross bars 14 are arranged in an arc shape along the front-to-back direction and are equidistant from each other. The cross section of each cross bar 14 is square, and the surface of the printing platform formed by the plurality of cross bars 14 is high in the middle and low on both sides.

[0031] A plurality of printing guide rollers 21, a paper feed guide roller 22, and a paper discharge guide roller 23 are rotatably connected between the two wall panels 12. A paper roll 70 is wound around these rollers 21, 22, and 23. The printing guide rollers 21 support the paper roll 70 upward, while the paper feed guide rollers 22 and 23 press the paper roll 70 downward. The printing guide rollers 21 provide tension for the paper roll 70 and, together with the printing platform, ensure that the paper roll 70 is flat. The paper feed guide rollers 22 guide the paper roll 70 as it winds from one group to another, thus defining the paper path. The paper feed guide roller 22 is rotatably connected to the bottom front side of the two wall panels 12, and the paper discharge guide roller 23 is rotatably connected to the bottom rear side of the two wall panels 12; the multiple printing guide rollers 21 are located above the paper feed guide roller 22 and the paper discharge guide roller 23, and both ends of each printing guide roller 21 are rotatably connected to the middle position of the wall panel 12; the multiple printing guide rollers 21 are arranged in an arc shape along the front-to-back direction and are equidistant from each other. The arc formed by the multiple printing guide rollers 21 is high in the middle and low on both sides. The multiple printing guide rollers 21 are staggered with the multiple cross bars 14. A printing guide roller 21 is provided between two adjacent cross bars 14, and the printing guide roller 21 protrudes upward from the surface of the cross bar 14.

[0032] The fan-shaped printing carriage assembly 50 includes multiple groups of printing carriages 52. Each group of printing carriages 52 can move independently, or all four groups can move simultaneously, driven by the carriage drive mechanism. The tops of the multiple groups of printing carriages 52 are fixedly connected to the sliding magnets 42 of the multiple magnetically coupled rodless cylinders 40. The multiple groups of printing carriages 52 are arranged in a front-to-back direction. In this embodiment, there are four groups of printing carriages 52, arranged in a fan shape, each printing one of four colors.

[0033] Each set of printing carriages 52 is used to print various patterns on a paper roll, and includes two sliding side panels 521 , a box body 522 sandwiched between the two sliding side panels 521 , a plurality of nozzles 523 installed at the bottom of the box body 522 , and a control circuit board 524 installed on one side of the box body 522 .

[0034] The top of the sliding side panel 521 is slidably mounted on the guide rail 152 and is fixedly connected to the sliding magnet 42 of the magnetically coupled rodless cylinder 40. The sliding side panel 521 is provided with an inspection window 525 and an observation window 526. The inspection window 525 is fitted with an acrylic decorative panel that can be removed for easy installation or maintenance. The observation window 526 facilitates observation of the status of the printhead 523 within the printing carriage 52.

[0035] The bottom surface of the box 522 is the printing surface 520, which is perpendicular to the surface of the printed paper. The multiple nozzles 523 are arranged on the printing surface 520. The nozzles 523 use Epson S3200 nozzles for digital printing. In order to adapt to the paper rolls 70 that are curved and protrude upward and are wound on the multiple printing guide rollers 21, the printing surfaces 520 of the multiple groups of printing carriages 52 are arranged into an arc surface, which is high in the middle and low on both sides. The arc surface is based on a circle with a radius of 2 meters. The curvature between the printing surfaces 520 of two adjacent printing carriages 52 is 6 degrees.

[0036] The control circuit board 524 controls the lifting motor 66 and the magnetically coupled rodless cylinder 40 to control the entire printing process. The printing surface 520 may also be provided with a photocell for sensing the position below the nozzle 523. The photocell transmits the sensed position signal to the control circuit board 524.

[0037] The ink collection cartridge 30 is used to receive waste ink from the print heads 523 of the fan-shaped printing carriage 50 during cleaning, collecting the waste ink for centralized processing. The ink collection cartridge 30 has a groove for receiving waste ink from the print heads 523 of the printing carriage 52. The groove also has a liquid inlet for the inflow of cleaning fluid.

[0038] The lifting mechanism 60 is disposed between the support frame 16 and the ink cartridge 30, providing support and power for the lifting of the ink cartridge 30. The lifting mechanism 60 includes four screw elevators 61 mounted on the support frame 16, two commutators 62, a lifting speed reducer 65, a lifting connecting rod 63 connected between the screw elevators 61, a speed reduction connecting rod 67 connected between the lifting speed reducer 65 and the commutator 62, and a lifting motor 66 fixed to the lifting speed reducer 65. Four spiral elevators 61 are connected to the bottom of the ink cartridge 30. Two lifting links 63 are provided. The lifting links 63 are connected to the spiral elevators 61 located on both sides of the support frame 16 through a coupling 64. Two reduction links 67 are provided, symmetrically located on both sides of the lifting reducer 65. The reduction links 67 are respectively connected to the commutator 62 and the lifting reducer 65 through a coupling 64. The two commutators 62 are symmetrically located on both sides of the lifting reducer 65. The commutator 62 is also arranged opposite the spiral elevator 61 and connected to the spiral elevator 61 through a coupling 64. The commutator 62 is used to connect the spiral elevator 61 to the lifting reducer 65, so that a single lifting motor 66 can synchronously control the four spiral elevators 61, resulting in a simple structure and convenient control.

[0039] When the present invention is in use, the paper roll 70 enters the paper feed guide roller 22 and then enters the printing guide roller 21 and the printing platform. The initial position of the fan-shaped printing carriage group 50 is directly above the ink cartridge 30. During normal operation, the carriage drive mechanism drives the printing carriage 52 from right to left, entering the appropriate position in the area where the paper roll to be printed is located. After the photoelectric eye senses the position mark, it transmits the position signal to the control circuit board 524. The printing carriage 52 receives the printing signal and begins printing. During the printing process, each group of printing carriages 52 will automatically track its position through the visual system to ensure the accurate printing position of the four groups of printing carriages 52. After printing is completed, the carriage drive mechanism drives the printing carriage 52 from left to right, returning the fan-shaped printing carriage assembly 50 to its initial position. The lifting mechanism 60 drives the ink cartridge 30 upward to perform moisturizing, cleaning, and maintenance on the nozzle 523. The nozzle 523 extends into the groove of the ink cartridge 30, and the cleaning liquid flows into the groove through the liquid inlet to soak and clean the nozzle 523. This prevents the surface of the nozzle 523 from being exposed to visible light and contaminated by dust particles during the idle process, thus preventing nozzle clogging of the nozzle 523 and improving printing quality and service life. When the nozzle 523 no longer requires moisturizing maintenance, the lifting mechanism 60 drives the ink cartridge 30 down to its lowest point.

[0040] The above-mentioned folding fan type digital printing unit provided by the present invention is convenient for moving the folding fan type printing trolley group 50 to a suitable position in the area where the paper roll 70 to be printed is located to print on the paper roll 70 by setting a trolley drive mechanism connected between the frame and the ink cartridge 30 and a lifting mechanism 60 connected between the frame and the ink cartridge 30. After the printing is completed, the folding fan type printing trolley group 50 automatically returns to the initial position, and the lifting mechanism 60 drives the ink cartridge 30 to rise, so that the nozzle 523 extends into the groove of the ink cartridge 30, so that the waste ink on the nozzle 523 is received by the ink cartridge 30 and the waste ink is collected and centrally processed. Therefore, the above-mentioned folding fan type digital printing unit provided by the present invention is easy to operate, simple in structure, convenient for cleaning and maintenance of the nozzle 523, and avoids clogging of the nozzle of the nozzle 523.

[0041] Any matters not mentioned in the above specific embodiments of the present invention belong to the common knowledge in this field and can be implemented with reference to the common knowledge.

[0042] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A fan-shaped digital printing unit for web printing, comprising a frame, characterized in that: The machine also includes an ink cartridge, a folding fan-type printing trolley group, a trolley driving mechanism and a lifting mechanism. A plurality of printing guide rollers, a paper feed guide roller and a paper discharge guide roller are rotatably connected to the inner side of the frame, and the paper to be printed is wound on the plurality of printing guide rollers; a guide rail is provided on the top of the frame, and the folding fan-type printing trolley group is slidably installed on the guide rail, and the trolley driving mechanism is connected between the frame and the folding fan-type printing trolley group, and is used to drive the folding fan-type printing trolley group to slide left and right along the guide rail; the folding fan-type printing trolley group includes a plurality of groups of printing trolleys, and the plurality of groups of printing trolleys are arranged in a fan shape, and a nozzle is provided at the bottom of each group of printing trolleys; the lifting mechanism is provided on the outside of the frame, and the ink cartridge is connected to the top of the lifting mechanism. The initial position of the folding fan-type printing trolley group is located directly above the ink cartridge, and the nozzle of each group of printing trolleys extends into the ink cartridge; The carriage drive mechanism drives the printing carriage to move along the guide rails, enters the area where the paper roll to be printed is located, and prints on the paper roll; after the printing is completed, the carriage drive mechanism drives the printing carriage to move along the guide rails, so that the folding fan printing carriage group returns to the initial position; The frame includes two wall panels, one on the left and one on the right, arranged vertically. The multiple printing guide rollers, paper feed guide rollers, and paper discharge guide rollers are rotatably connected between the two wall panels. Each wall panel is provided with a through guide hole for the printing carriage to pass through. The through guide holes of the two wall panels are aligned in the left-right direction, and the lower edges of the through guide holes are in an arc shape with a higher middle and lower sides. The frame also includes a support plate provided on top of the two wall panels, the support plate being a box plate structure formed by integrally welding a plurality of cross beams, the support plate being arranged horizontally, the support plate penetrating the through guide holes of the two wall panels from right to left, the support plate being connected and fixed to the two wall panels by screws, the upper surface of the support plate abutting against the upper edges of the through guide holes of the two wall panels, and the bottom of the support plate being provided with the guide rail along its length direction; Two side plates are fixed to the two ends of the support plate by screws, and the trolley drive mechanism is provided between the two side plates. The trolley drive mechanism is a plurality of magnetically coupled rodless cylinders installed between the two side plates. The sliding magnets of the magnetically coupled rodless cylinders are fixed to the top of the folding fan type printing trolley group. The frame also includes a support frame arranged on the outside of one of the wall panels, a portion of the support plate extends outward from the wall panel and is located directly above the support frame, a lifting mechanism is arranged between the support frame and the ink cartridge, the lifting mechanism includes four spiral elevators installed on the support frame, two commutators and a lifting reducer, a lifting connecting rod connected between the spiral elevators, a reduction connecting rod connected between the lifting reducer and the commutator, and a lifting motor fixed to the lifting reducer, the four spiral elevators are correspondingly connected to the bottom of the ink cartridge; The tops of the multiple groups of printing carriages are connected and fixed to the sliding magnets of the multiple magnetically coupled rodless cylinders. Each group of printing carriages also includes two sliding side panels, a box body sandwiched between the two sliding side panels, and a control circuit board installed on one side of the box body. The nozzles are installed at the bottom of the box body, and the tops of the sliding side panels are slidably installed on the guide rails and are connected and fixed to the sliding magnets of the magnetically coupled rodless cylinders. The sliding side panels are provided with inspection windows and observation windows, and the inspection windows are installed with acrylic decorative panels.

2. The fan-shaped digital printing unit for web printing according to claim 1, characterized in that: The frame also includes a printing platform arranged between the two wall panels, and the printing platform includes a plurality of cross bars connected between the two wall panels. The plurality of cross bars are arranged in an arc shape along the front-to-back direction and are equidistant from each other. The cross section of each cross bar is square, and the surface of the printing platform formed by the plurality of cross bars is high in the middle and low on both sides.

3. The fan-shaped digital printing unit for web printing according to claim 2, characterized in that: The multiple printing guide rollers are arranged in an arc shape along the front-to-back direction and are equidistant from each other. The arc formed by the multiple printing guide rollers is higher in the middle and lower on both sides. The multiple printing guide rollers are staggered with the multiple cross bars. A printing guide roller is provided between two adjacent cross bars, and the printing guide roller protrudes upward from the surface of the cross bar.

4. The fan-shaped digital printing unit for web printing according to claim 3, characterized in that: The bottom surface of the box body is a printing surface, and the multiple nozzles are arranged on the printing surface. The printing surfaces of the multiple groups of printing carriages are arranged into an arc surface, which is high in the middle and low on both sides.

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