Digital image printing device and printing method

Abstract

This application discloses a digital image printing device and printing method, relating to the technical field of inkjet printers. The device comprises a frame and a fixed assembly, wherein the frame is mounted with a guide rail, a print head being slidably connected to the guide rail, a decoder being mounted on the side of the print head facing the guide rail, the guide rail having a parallel limit slot and a detection window along its length, the limit slot and the detection window being connected, and the detection window being located on the side of the limit slot near the decoder; the fixed assembly comprises a reel, a reel, and a first drive member, the reel and the reel being respectively disposed at opposite ends of the guide rail, both being rotatably mounted on the frame, and the rotation axes of both reel and reel being arranged in a vertical direction. This application facilitates replacement of the grating scale of the inkjet printer, thereby reducing maintenance time for the inkjet printer.

Description

Technical Field

[0001] The present application relates to the technical field of inkjet printers, and in particular to a digital image inkjet printing device and a printing method. Background Art

[0002] Inkjet printers are printing devices based on inkjet technology. They can print high-definition images and text on a variety of materials, offering personalized decorative capabilities and high printing speeds. Due to their diverse printing effects, reduced coating agent consumption, reduced pollution, and low maintenance costs, inkjet printers are widely used in advertising, decoration, automotive advertising, and textile printing.

[0003] An inkjet printer consists of a print station, a print head, guide rails, a drive assembly, and an ink supply assembly. The print station is used to position and move the printing material. The print head includes multiple nozzles that precisely spray ink onto the printed material. The ink supply assembly ensures a continuous and even flow of ink to the nozzles through an ink reservoir and supply lines. The drive assembly controls the movement of the print head along the guide rails. The inkjet printer detects the position and speed of the print head using a grating sensor. The grating sensor consists of a grating scale and a decoder. The grating scale is a flexible strip. The grating scale is positioned along the length of the guide rails and is bolted to the rails at both ends. The grating sensor's decoder is fixed to the print head. The decoder converts the print head's position and speed information into electrical signals and transmits them to the control module, which controls the drive assembly to move the print head.

[0004] Inkjet printers utilize technology similar to that of inkjet printers. Based on the Bernoulli principle, they control the coordination of airflow and ink flow, allowing the ink to mix with the airflow at the nozzle, forming a mist that is then ejected. During the printing process, the user's design is first analyzed by the image processing system and then converted into specific printing instructions. These instructions control the opening and closing of the printhead nozzles, as well as the amount and speed of ink ejected. Simultaneously, the drive assembly controls the movement of the printhead, thereby forming the desired image and color on the printed material.

[0005] However, the nozzle is prone to splashing ink onto the grating scale during debugging, causing the scale to be covered by ink and become ineffective. The grating scale is prone to shaking during printing and scratching the print head, causing the scale on the grating scale to be worn and ineffective. The failure of the grating scale causes the inkjet printer to have problems such as garbled characters, misalignment, and inaccurate return to the origin. At this time, the user needs to replace the grating scale to solve the problem.

[0006] When replacing a scale, the user first removes the failed scale. Then, one end of the new scale is bolted to the guide rail. The other end passes through the print head and is bolted to the other end of the guide rail. The user then trims off the excess scale and adjusts the position of the decoder to a distance of 2mm-3mm between the decoder and the scale. This cumbersome process results in wasted scale, prolonged maintenance of the printer, and increased maintenance costs. Summary of the Invention

[0007] In order to facilitate the replacement of the grating scale of an inkjet printer and reduce the maintenance time of the inkjet printer, the present application provides a digital image inkjet printer device and an inkjet printer method.

[0008] This application provides a digital image printing device and printing method, which adopts the following technical solutions:

[0009] A digital image printing device and printing method, comprising:

[0010] A frame, wherein the frame is mounted with a guide rail, the guide rail is slidably connected to a print head, a decoder is mounted on a side of the print head facing the guide rail, the guide rail is provided with a limit groove and a detection window arranged in parallel along its length, the limit groove and the detection window are connected, and the detection window is arranged on a side of the limit groove close to the decoder;

[0011] A fixed assembly, comprising an unwinding roller, a winding roller, and a first driving member, wherein the unwinding roller and the winding roller are respectively arranged at both ends of the guide rail, and the unwinding roller and the winding roller are both rotatably arranged on the frame, and the rotation axes of the unwinding roller and the winding roller are both arranged in the vertical direction. The unwinding roller is used to install the grating scale roll, and the winding roller is used to fix one end of the grating scale so that the grating scale passes through the limiting slot. The first driving member is used to drive the winding roller to rotate;

[0012] The unwinding roller is used to install the grating scale roll, and the winding roller is used to fix one end of the grating scale so that the grating scale passes through the limiting groove. The first driving member is used to drive the winding roller to rotate. When the winding roller rotates, the grating scale inside the limiting groove is wound on the winding roller, and the grating scale on the grating scale roll moves into the limiting groove.

[0013] By adopting the above technical solution, limit grooves and detection windows are set on the guide rail and connected to each other, allowing the grating scale to slide freely in them, and the decoder can detect the scale on the grating scale through the detection window. The setting of the unwinding roller and the winding roller simplifies the installation and replacement process of the grating scale, allowing the grating scale to be used continuously, reducing the number of replacements and material waste.

[0014] Optionally, a positioning assembly is included, including a second driving member and a pressure block, the pressure block is slidably arranged on the inner wall of the limit groove in a direction close to or away from the detection window, the pressure block is arranged along the length direction of the guide rail, the width of the pressure block is greater than the width of the detection window, and the second driving member is used to drive the pressure block to move.

[0015] By adopting the above technical solution, the pressure block and the second driving member can dynamically adjust the position of the grating ruler to ensure that the distance between it and the decoder is always maintained in the optimal state, thereby improving positioning accuracy.

[0016] Optionally, the positioning assembly includes an elastic member connected between the pressing block and the inner wall of the limiting groove.

[0017] By adopting the above technical solution, when the pressure block and the inner wall of the limit groove cooperate, the second driving member can control the force applied by the pressure block to the grating ruler by controlling the deformation length of the elastic member, thereby reducing the situation where the pressure block applies excessive force on the grating ruler and causing damage to the grating ruler, thereby extending the service life of the grating ruler.

[0018] Optionally, the pressure block is rotatably connected to one end of the detection window with multiple pressure rollers, the width of the pressure roller is greater than the width of the detection window, the rotation axis of the pressure roller is arranged in the vertical direction, and the pressure roller is used to clamp the grating scale together with the inner wall of the limit groove.

[0019] By adopting the above technical solution, the clamping roller design on the pressure block reduces friction by rolling instead of sliding, protects the grating scale from wear, and ensures stable transmission of the grating scale.

[0020] Optionally, the bottom wall of the unwinding roller is coaxially rotatably connected to a positioning plate, the positioning plate is fixedly connected to the frame, and the positioning plate is used to place the grating scale roll.

[0021] By adopting the above technical solution, the setting of the positioning plate provides a stable placement position for the grating scale roll, reduces the possibility of the grating scale roll falling, facilitates the rapid installation and replacement of the grating scale, and improves maintenance efficiency.

[0022] Optionally, the positioning disk is fixedly connected to a fixing ring around the unwinding roller, the fixing ring is provided with a makeshift opening, the fixing ring is fixedly connected to a first airbag along its own length direction, and the unwinding roller is fixedly connected to a second airbag around its own rotation axis. When the first airbag and the second airbag are inflated, the grating scale roll is clamped between the first airbag and the second airbag, and embedded in the first airbag and the second airbag.

[0023] By adopting this technical solution, the scale roll is clamped between and embedded in the first and second airbags, stably securing the scale roll to the unwinding roller and achieving automatic clamping of the scale roll, simplifying the installation process and reducing the complexity of manual operation. Furthermore, as the scale roll unwinds, its outer diameter gradually decreases, and the airbags maintain a stable grip even as the outer diameter decreases.

[0024] Optionally, the outer wall of the first airbag and the inner wall of the second airbag are both serrated.

[0025] By adopting the above technical solution, the serrated structure improves the clamping stability of the grating scale roll and reduces the spreading or displacement of the grating scale roll.

[0026] Optionally, a tensioning roller is provided between the unwinding roller and the winding roller, the tensioning roller is rotatably connected to the frame, and the tensioning roller is used to tension the grating ruler.

[0027] By adopting the above technical solution, the uniform tension of the grating scale is ensured, printing errors caused by uneven tension are avoided, and the printing quality is improved.

[0028] In a second aspect, the present application provides a digital image printing method, comprising the following steps:

[0029] S1. The print head and printing material are positioned to the initial position;

[0030] S2, the print head sprays ink intermittently to detect whether the nozzle is clogged;

[0031] S3, input the inkjet graphics and set the position of the inkjet graphics on the printing table;

[0032] S4, the print head moves along the guide rail and sprays ink. After the print head moves from one end of the guide rail to the other end, the print head pauses, and then the printing material moves along the length direction perpendicular to the guide rail;

[0033] S5. Repeat step S5 until the printing of the inkjet graphics is completed, then the print head is positioned to the initial position, and the production staff removes the printing material with the inkjet graphics printed on it.

[0034] In summary, this application has at least one of the following beneficial effects:

[0035] 1. Set limit grooves and detection windows on the guide rails and connect them to allow the scale roll to slide freely in them. The decoder can detect the scale scale through the detection window. The setting of the unwinding roller and the winding roller simplifies the installation and replacement process of the scale scale, allowing the scale to be used continuously, reducing the number of replacements and material waste.

[0036] 2. The pressure block and the second drive member can dynamically adjust the position of the grating ruler to ensure that the distance between it and the decoder is always maintained at the optimal state, thereby improving positioning accuracy;

[0037] 3. When the pressure block and the inner wall of the limiting groove cooperate, the second driving member can control the force applied by the pressure block on the grating ruler by controlling the deformation length of the elastic member, thereby reducing the situation where the pressure block applies excessive force on the grating ruler and causing damage to the grating ruler, thereby extending the service life of the grating ruler;

[0038] 4. The scale roll is clamped between and embedded in the first and second airbags, stably securing the roll to the unwinding roller and enabling automatic clamping of the roll, simplifying the installation process and reducing the complexity of manual operation. Furthermore, as the roll unwinds, the outer diameter of the roll gradually decreases, and the airbags maintain a stable grip on the roll despite this decrease. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0040] Figure 2 This is a schematic structural diagram showing a cross section of a limit groove and a detection window in an embodiment of the present application;

[0041] Figure 3 yes Figure 1 Schematic diagram of the partial cross-section structure at AA in the middle;

[0042] Figure 4 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0043] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure at point B in the middle.

[0044] Explanation of the accompanying drawings: 2. Frame; 21. Printing table; 22. Bracket; 3. Guide rail; 4. Limiting groove; 5. Detection window; 6. Print head; 7. Decoder; 8. Grating scale roll; 9. Fixing assembly; 91. Unwinding roller; 92. Positioning plate; 93. Fixing ring; 94. Yield; 95. First airbag; 96. Second airbag; 97. Winding roller; 98. First driving member; 99. Air pump; 910. Tensioning roller; 10. Positioning assembly; 101. Pressure block; 102. Second driving member; 103. Elastic member; 104. Pressure roller; 11. Grating scale. DETAILED DESCRIPTION

[0045] The grating sensor includes a scale 11 and a decoder 7. The decoder 7 works in conjunction with the scale 11 to read the position and velocity information of the print head 6. The scale 11 is a flexible strip, typically rolled up into a disc-shaped scale roll 8. The inkjet printer's print head 6 is equipped with multiple nozzles. These nozzles can easily spray ink during commissioning, contaminating the scale 11. Furthermore, the print head 6 can easily fling ink onto the scale 11 during movement, contaminating it. Alternatively, the print head 6 can scrape against the scale 11 during movement, rendering it inoperable.

[0046] The following is combined with Figure 1-5 This application is described in further detail.

[0047] The digital image printing device and printing method disclosed in the embodiment of the present application refer to Figure 1 and Figure 2 The digital image printing device includes a frame 2, the frame 2 includes a printing table 21, and the printing table 21 is fixedly connected to a guide rail 3 set in a horizontal direction.

[0048] Reference Figure 2 and Figure 3 The guide rail 3 is provided with a limit slot 4 and a detection window 5 in parallel along its length direction. The limit slot 4 and the detection window 5 are interconnected and both pass through the two ends of the guide rail 3. The end of the detection window 5 away from the limit slot 4 passes through the guide rail 3. In the vertical direction, the length of the detection window 5 is less than the length of the limit slot 4 and less than the length of the grating scale 11.

[0049] Reference Figure 1 The guide rail 3 is connected to the print head 6 by a linear motor in a sliding manner along its own length, so that the print head 6 is located above the printing table 21. The print head 6 is equipped with a decoder 7, a nozzle and an ink supply assembly for supplying ink to the nozzle. The decoder 7 is fixedly connected to the end of the print head 6 facing the guide rail 3. The decoder 7 is arranged corresponding to the detection window 5, so that the decoder 7 can be used in conjunction with the grating ruler 11 through the detection window 5.

[0050] Reference Figure 1 and Figure 2The digital image printing device also includes a fixed component 9 arranged on both sides of the guide rail 3, and the fixed component 9 includes a unwinding roller 91, a positioning disk 92 and a winding roller 97. The positioning disk 92 and the winding roller 97 are respectively arranged on both sides of the guide rail 3. The positioning disk 92 is fixedly connected to the bracket 22 at one end of the guide rail 3. The unwinding roller 91 is arranged on the top of the positioning disk 92 and is rotatably connected to the positioning disk 92. The rotation axis of the unwinding roller 91 is arranged in the vertical direction. The winding roller 97 is arranged on the top of the bracket 22 at the other end of the guide rail 3 and is rotatably connected thereto. The rotation axis of the winding roller 97 is arranged in the vertical direction. The bracket 22 below the winding roller 97 is fixedly connected to a first driving member 98. The first driving member 98 is a motor. The output end of the first driving member 98 is coaxially fixedly connected to the winding roller 97.

[0051] When installing the grating scale 11 for the first time, the operator places the grating scale roll 8 on the mounting plate and puts it on the unwinding roller 91. Then the operator unfolds part of the grating scale roll 8 and makes one end of the grating scale 11 pass through the limit slot 4 along the length direction of the guide rail 3 and be fixed to the winding roller 97. The decoder 7 on the print head 6 can cooperate with the grating scale roll 8 through the detection window 5 to control the position and speed of the print head 6.

[0052] When the grating scale 11 in the limit slot 4 fails due to contamination or wear, the first driving member 98 drives the winding roller 97 to rotate, so that the grating scale 11 in the limit slot 4 is wound on the winding roller 97, and at the same time the unwinding roller 91 rotates, so that the grating scale roll 8 is unwound, and the new grating scale 11 passes through the limit slot 4, so that the new grating scale 11 in the limit slot 4 replaces the old grating scale 11.

[0053] When the grating scale 11 is completely wound on the winding roller 97 , the operator removes the grating scale roll 8 wound on the winding roller 97 and repeats the above process of installing the grating scale 11 .

[0054] The provision of the unwinding roller 91 and the winding roller 97 simplifies the installation and replacement process of the grating scale 11, allowing the grating scale 11 to be used continuously, reducing the number of replacement times involving operators and the material waste when operators replace the grating scale 11.

[0055] Reference Figure 3The digital image printing device includes a positioning assembly 10 disposed within the limiting groove 4. The positioning assembly 10 includes a pressure block 101 and a second driving member 102. The pressure block 101 is a long strip with a rectangular cross-section and is arranged along the length of the guide rail 3. The pressure block 101 is slidably connected to the inner wall of the limiting groove 4 in a horizontal plane perpendicular to the length of the limiting groove 4. The pressure block 101 is rotatably connected to one end of the pressure block 101 facing the detection window 5. The rotation axis of the pressure roller 104 is arranged in the vertical direction. The multiple pressure rollers 104 are spaced apart along the length of the pressure block 101. The pressure rollers 104 are cylindrical in shape with their axes arranged in the vertical direction. The end of the pressure roller 104 near the detection window 5 protrudes from the end surface of the pressure block 101. The second driving member 102 is an electric push rod, which is fixedly connected to the inner wall of the limiting groove 4. The moving direction of the output end of the second driving member 102 is perpendicular to the length direction of the limiting groove 4 in the horizontal plane. A plurality of elastic members 103 are fixedly connected between the output end of the second driving member 102 and the pressure block 101, and the plurality of elastic members 103 are arranged at intervals along the horizontal direction of the guide rail 3.

[0056] When the grating ruler 11 is installed for the first time, the second driving member 102 drives the clamping roller 104 to move away from the detection window 5 through the elastic member 103 and the pressure block 101, and the operator passes one end of the grating ruler 11 through the limit groove 4, so that the grating ruler 11 is located between the clamping roller 104 and the detection window 5, and then the second driving member 102 drives the clamping roller 104 to move toward the detection window 5 through the elastic member 103 and the pressure block 101, causing the elastic member 103 to undergo compression deformation. At this time, the elastic member 103 applies pressure on the clamping roller 104 toward the detection window 5, so that the clamping roller 104 and the inner wall of the limit groove 4 jointly clamp the grating ruler 11 inside the limit groove 4, thereby fixing the position of the grating ruler 11 inside the limit groove 4.

[0057] The second driving member 102 can control the force applied by the pressure block 101 to the grating scale 11 by controlling the deformation length of the elastic member 103, thereby reducing the situation where the pressure block 101 applies excessive force to the grating scale 11 and causing damage to the grating scale 11, thereby extending the service life of the grating scale 11.

[0058] When replacing the grating scale 11 in the limiting groove 4, the output end of the second driving member 102 moves away from the detection window 5, causing the elastic member 103 to recover its deformation, and then the first driving member 98 drives the winding roller 97 to rotate. This can reduce the pressure applied by the pressure roller 104 on the grating scale 11, thereby reducing the friction between the grating scale 11 and the inner wall of the limiting groove 4, facilitating the movement of the grating scale 11 in the limiting groove 4 and reducing the friction between the grating scale 11 and the inner wall of the limiting groove 4.

[0059] The pressing roller 104 on the pressing block 101 reduces friction by rolling instead of sliding, reduces the wear of the grating ruler 11 when it moves, and improves the stability of the grating ruler 11 during transportation.

[0060] Reference Figure 4 and Figure 5 A fixing ring 93 is fixedly connected to the top of the mounting plate. The fixing ring 93 is arranged around the unwinding roller 91. A clearance opening 94 is opened on the fixing ring 93, so that the fixing ring 93 breaks at the clearance opening 94. A first airbag 95 is fixedly connected to the inner wall of the fixing ring 93 along its own length. A second airbag 96 is fixedly connected to the outer wall of the unwinding roller 91 along its own length. The inner wall of the first airbag 95 and the outer wall of the second airbag 96 are both serrated. An air pump 99 is fixedly connected to the bottom wall of the mounting plate. The output end of the air pump 99 is connected to the first airbag 95 and the second airbag 96, so that the air pump 99 can inflate the first airbag 95 and the second airbag 96 or extract the gas in the first airbag 95 and the second airbag 96.

[0061] When installing the grating scale roll 8, the grating scale roll 8 is placed on the positioning plate 92, and is sleeved on the outside of the second air bag 96, and is located between the first air bag 95 and the second air bag 96, and one end of the grating scale roll 8 is passed through the yield port 94, and then the air pump 99 inflates the first air bag 95 and the second air bag 96, so that the grating scale roll 8 is embedded between the first air bag 95 and the second air bag 96, and is clamped between the inner wall of the first air bag 95 and the outer wall of the second air bag 96. At this time, the serrated side walls of the first air bag 95 and the second air bag 96 are deformed due to extrusion. When the size of the grating scale roll 8 gradually decreases with the use of the inkjet printer, the serrated side walls of the first air bag 95 and the second air bag 96 gradually expand, so that the first air bag 95 and the second air bag 96 can still clamp the grating scale roll 8.

[0062] When replacing the grating scale 11, the friction between the grating scale roll 8 and the second airbag 96 drives the second airbag 96 to rotate, and the second airbag 96 drives the unwinding roller 91 to rotate. The serrated side wall can increase the friction between the first airbag 95\second airbag 96 and the grating scale roll 8, thereby improving the clamping stability of the grating scale roll 8 and reducing the spreading or displacement of the grating scale roll 8.

[0063] Automatic clamping of the grating scale roll 8 is achieved, the installation process is simplified, and the complexity of manual operation is reduced.

[0064] Reference Figure 1 A tensioning roller 910 is provided between the winding roller 97 and the guide rail 3 and between the unwinding roller 91 and the guide rail 3. The tensioning roller 910 is fixedly connected to the printing table 21, and the rotation axis of the tensioning roller 910 is provided in the vertical direction.

[0065] One end of the optical scale 11 is wound around a tensioning roller 910 near the unwinding roller 91, then passes through the limiting slot 4 and is wound around a tensioning roller 910 near the winding roller 97, and finally fixed to the winding roller 97. The tensioning roller 910 ensures uniform tension on the optical scale 11, reducing printing errors caused by uneven tension and improving print quality.

[0066] The implementation principle of a digital image printing device and printing method in an embodiment of the present application is: the setting of the unwinding roller 91 and the winding roller 97 simplifies the installation and replacement process of the grating scale 11, so that the grating scale 11 can be used continuously, reducing the number of replacement times involved by the operator and the material waste when the operator replaces the grating scale 11.

[0067] The present application also discloses a printing method of a digital image printing device, comprising the following steps:

[0068] S1, the print head 6 and the printing material are all positioned to the initial position;

[0069] S2, the print head 6 sprays ink intermittently to detect whether the nozzle is clogged;

[0070] S3, input the inkjet graphics and set the position of the inkjet graphics on the printing table 21;

[0071] S4, the print head 6 moves along the guide rail 3 and sprays ink. After the print head 6 moves from one end of the guide rail 3 to the other end, the print head 6 pauses, and then the printing material moves along the length direction perpendicular to the guide rail 3;

[0072] S5, repeat step S5 until the printing of the graphics is completed, then the print head 6 is positioned to the initial position, and the production staff removes the printed material with the graphics printed on it.

[0073] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A digital image printing device, characterized in that: include: A frame (2), the frame (2) being provided with a guide rail (3), the guide rail (3) being slidably connected to a print head (6), a decoder (7) being provided on a side of the print head (6) facing the guide rail (3), the guide rail (3) being provided with a limit groove (4) and a detection window (5) arranged in parallel along its length direction, the limit groove (4) and the detection window (5) being connected, and the detection window (5) being provided on a side of the limit groove (4) close to the decoder (7); A fixed assembly (9) comprising an unwinding roller (91), a winding roller (97) and a first driving member (98), wherein the unwinding roller (91) and the winding roller (97) are respectively arranged at two ends of the guide rail (3), the unwinding roller (91) and the winding roller (97) are both rotatably arranged on the frame (2), and the rotation axes of the unwinding roller (91) and the winding roller (97) are both arranged in the vertical direction; The unwinding roller (91) is used to install the grating scale roll (8), the winding roller (97) is used to fix one end of the grating scale (11) so that the grating scale (11) passes through the limiting groove (4), and the first driving member (98) is used to drive the winding roller (97) to rotate. When the winding roller (97) rotates, the grating scale (11) inside the limiting groove (4) is wound on the winding roller (97), and the grating scale (11) on the grating scale roll (8) moves into the limiting groove (4); The decoder (7) is used in conjunction with the grating ruler (11) to read the position and speed information of the print head (6).

2. The digital image printing device according to claim 1, characterized in that: The invention comprises a positioning assembly (10), wherein the positioning assembly (10) comprises a second driving member (102) and a pressing block (101), wherein the pressing block (101) is slidably arranged on the inner wall of the limiting groove (4) in a direction approaching or moving away from the detection window (5), the pressing block (101) is arranged along the length direction of the guide rail (3), the width of the pressing block (101) is greater than the width of the detection window (5), and the second driving member (102) is used to drive the pressing block (101) to move.

3. The digital image printing device according to claim 2, characterized in that: The positioning assembly (10) further comprises an elastic member (103), wherein the elastic member (103) is connected between the pressing block (101) and the inner wall of the limiting groove (4).

4. The digital image printing device according to claim 2, characterized in that: The pressure block (101) is rotatably connected to one end of the detection window (5) with a plurality of pressure rollers (104), the width of the pressure rollers (104) being greater than the width of the detection window (5), the rotation axis of the pressure rollers (104) being arranged in a vertical direction, and the pressure rollers (104) being used to clamp the grating ruler (11) together with the inner wall of the limiting groove (4).

5. The digital image printing device according to claim 1, characterized in that: The bottom wall of the unwinding roller (91) is coaxially rotatably connected to a positioning plate (92), and the positioning plate (92) is fixedly connected to the frame (2). The positioning plate (92) is used to place the grating scale roll (8).

6. The digital image printing device according to claim 5, characterized in that: The positioning plate (92) is fixedly connected to a fixing ring (93) around the unwinding roller (91), and the fixing ring (93) is provided with a clearance opening (94). The fixing ring (93) is fixedly connected to a first airbag (95) along its own length direction, and the unwinding roller (91) is fixedly connected to a second airbag (96) around its own rotation axis. When the first airbag (95) and the second airbag (96) are inflated, the grating scale roll (8) is clamped between the first airbag (95) and the second airbag (96), and is embedded between the first airbag (95) and the second airbag (96).

7. The digital image printing device according to claim 6, characterized in that: The outer wall of the first airbag (95) and the inner wall of the second airbag (96) are both serrated.

8. The digital image printing device according to claim 1, characterized in that: A tensioning roller (910) is provided between the unwinding roller (91) and the winding roller (97), the tensioning roller (910) being rotationally connected to the frame (2), and the tensioning roller (910) being used for tensioning the grating ruler (11).

9. A digital image printing method, using the digital image printing device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1, the print head (6) and the printing material are all positioned to the initial position; S2, the print head (6) sprays ink intermittently to detect whether the nozzle is clogged; S3, input the inkjet graphics and set the position of the inkjet graphics on the printing table (21); S4, the print head (6) moves along the guide rail (3) and sprays ink. After the print head (6) moves from one end of the guide rail (3) to the other end, the print head (6) pauses and then the printing material moves in a longitudinal direction perpendicular to the guide rail (3); S5, repeat step S4 until the printing of the printed graphics is completed, then the print head (6) is positioned to the initial position, and the production staff removes the printed material with the printed graphics.

Images