A digital printer substrate correction device

Abstract

The application discloses a kind of digital printing machine base material correction device, belong to digital printing machine technical field, including device rack, two support racks are symmetrically and fixedly installed on device rack, bearing roller is arranged between two support racks, still include sliding cylinder, quick-release positioning assembly and base material correction component, sliding cylinder is slidably installed on bearing roller, quick-release positioning assembly is installed on two support racks, one end of bearing roller is also provided with driving device, quick-release positioning assembly includes bearing and detent frame, two bearings are slidably sleeved on bearing roller, two bearings are located at the two sides of sliding cylinder respectively, two bearings are respectively with two support racks abut, detent frame is installed on two support racks by fastener, detent frame bottom is adapted with bearing outer ring, base material correction component is set on device rack, solve the technical problem that existing base material correction device correction precision is lower, it is difficult to meet the high-precision requirement of digital printing.

Description

Technical Field

[0001] This invention belongs to the field of digital printing machine technology, and specifically relates to a digital printing machine substrate correction device. Background Technology

[0002] Digital printing presses, also known as flatbed printers, are digital printing devices that do not require plate making and can print directly on various materials one sheet at a time. They are a replacement for traditional printing presses and are mainly divided into two categories: industrial and office (digital printing all-in-one machines). They can be used for printing on substrates such as leather, metal, glass, and acrylic. The equipment supports full-color image printing in one pass, has low printing costs and flexible sizes, and uses special inks to achieve high color gamut coverage and color saturation effects, making it more environmentally friendly.

[0003] During the printing process, the substrate is prone to lateral displacement along the axis due to uneven material, tension, or installation errors of the feed shaft. This can lead to problems such as jamming and tangling, damaging the printing parts, and causing printing defects such as pattern misalignment, uneven edges, and missing content. Especially in multi-color printing, the substrate displacement can also cause color overlap deviation, which in turn affects the clarity of the image and the accuracy of the colors. Therefore, the substrate needs to be corrected before printing.

[0004] In actual operation, although the existing substrate correction devices have a wide adjustment range, they are mostly single adjustment methods, so their correction accuracy is generally low and it is difficult to meet the high precision requirements of digital printing. In addition, the correction structure is mostly rigid adjustment, which can easily cause impact on the substrate or other components in the device during the adjustment process, thus affecting the stability and accuracy of the correction. Summary of the Invention

[0005] The purpose of this invention is to provide a digital printing press substrate correction device to achieve high-precision correction of the substrate position, improve the accuracy and efficiency of substrate correction, and reduce printing defects caused by substrate misalignment.

[0006] To achieve the above objectives, embodiments of the present invention provide a substrate correction device for a digital printing machine, comprising a device frame, on which two support frames are symmetrically and fixedly mounted, and a bearing roller is disposed between the two support frames, and further comprising: A sliding cylinder, on which the substrate is slidably mounted; The quick-release positioning assembly is installed on both of the support frames to restrict the radial movement of the bearing roller. One end of the bearing roller is also provided with a driving device for connecting to one end of the bearing roller and transmitting power. A substrate alignment assembly is mounted on the device frame and is used to clamp the sliding cylinder and control the axial position between the sliding cylinder and the carrying roller when adjusting the substrate position, thereby adjusting the substrate position.

[0007] To facilitate the removal and installation of the bearing roller when changing or installing the substrate, the quick-release positioning assembly includes: The bearings are slidably mounted on the bearing roller, with the two bearings located on both sides of the sliding cylinder and respectively abutting against the two support frames; The positioning frame is installed on both of the support frames by fasteners. The bottom of the positioning frame is adapted to the outer ring of the bearing to fix the position of the bearing.

[0008] Furthermore, the drive device consists of a first motor and a coupling, one end of which is connected to the output end of the first motor, and the other end of which is connected to the bearing roller.

[0009] To adjust the conveying position of the substrate, the substrate alignment assembly includes: A support frame is located below the support roller, and a sliding frame is slidably mounted on the support frame; A sliding bracket, wherein two sliding brackets are symmetrically and slidably mounted on the sliding frame, and a clamping frame is mounted on each sliding bracket; A primary adjustment unit is installed inside the bearing frame to adjust the position of the sliding frame on the bearing frame; The secondary adjustment unit is installed on both of the sliding brackets and is used to make small adjustments to the relative position of the sliding cylinder and the bearing roller.

[0010] Furthermore, a bidirectional screw is rotatably installed inside the sliding frame, and two adjusting nuts are symmetrically and threadedly fitted on the bidirectional screw. The two adjusting nuts are respectively fixedly connected to the two sliding brackets. A second motor is fixedly installed on the sliding frame, and the output end of the second motor is fixedly connected to one end of the bidirectional screw.

[0011] To quickly adjust the conveying position of the substrate, the primary adjustment unit includes: A third motor is mounted on the support frame; A drive screw is rotatably mounted on the support frame. One end of the drive screw is fixedly connected to the output end of the third motor. A drive nut is threaded onto the drive screw and fixedly connected to the sliding frame.

[0012] To make minor adjustments to the conveying position of the substrate, the secondary adjustment unit includes: The limiting sleeves are symmetrically and fixedly installed inside each clamping frame. Each limiting sleeve has a rotating bracket slidably installed inside, and each rotating bracket has a roller rotatably installed on it. The annular plate is coaxially fixedly installed at both ends of the sliding cylinder, and the annular plate abuts against the corresponding roller.

[0013] Furthermore, it also includes control valves, each of the clamping frames is equipped with a control valve, and the output end of each control valve is connected to a primary three-way connector. The two output ends of the primary three-way connector are connected to air bladders through air supply pipes. Several air bladders are respectively located inside several limiting sleeves. The air bladders are fixedly installed inside the clamping frame and are fixedly connected to the rotating bracket. By controlling the pressure inside the air bladder, the position of the rotating bracket inside the limiting sleeve is finely adjusted.

[0014] The support frame is equipped with an air pump, and the output end of the air pump is connected to two inflation pipes through a two-stage tee connector. The two inflation pipes are respectively connected to the input end of the corresponding control valve.

[0015] To make the substrate conveying more stable, two guide rollers are symmetrically and rotatably installed on the device frame. A lifting bracket is provided on the device frame, and a driving component is installed on the device frame. The output end of the driving component is fixedly connected to the lifting bracket. Two pressure rollers are symmetrically and rotatably installed at the bottom of the lifting bracket. The two pressure rollers correspond one-to-one with the two guide rollers and are adapted to each other.

[0016] The significant technical effects of the embodiments of the present invention are as follows: 1. The digital printing machine substrate correction device provided in this embodiment of the invention uses bearings, a clamping frame and a quick-release elastic plum blossom coupling to quickly disassemble and assemble the carrier roller by loosening the fasteners. At the same time, the coupling can buffer the vibration of the motor transmission and compensate for coaxial deviation, which simplifies the substrate roll replacement process, reduces the material replacement time, and ensures the smooth rotation of the carrier roller, avoiding transmission jamming that affects the stability of substrate feeding.

[0017] 2. The digital printing press substrate correction device provided in this embodiment of the invention corrects the substrate through a primary adjustment section and a secondary adjustment section. The primary adjustment section achieves a large-range coarse adjustment of the substrate, while the secondary adjustment section achieves stepless fine adjustment by controlling the air pressure of the airbag. The flexible support avoids rigid impact, effectively improving the correction accuracy and efficiency and meeting the high-precision requirements of digital printing.

[0018] 3. The digital printing machine substrate correction device provided in this embodiment of the invention, through the cooperation of an air pump, control valve, air bag and limiting sleeve, can dynamically adjust in real time according to the slight changes in substrate offset, and the air pressure of the air bag in the initial state ensures good contact between the roller and the annular plate, ensuring the correction process is continuous and stable, and reducing printing defects.

[0019] 4. The digital printing machine substrate correction device provided in this embodiment of the invention can precisely control the distance between two sliding supports by cooperating with the bidirectional screw and adjusting nut in the sliding frame and the second motor, so as to realize the rapid opening and closing of the clamping frame, adapt to sliding cylinders of different lengths, and the force is uniform during clamping, avoiding the sliding cylinder from shifting, and further improving the correction stability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a digital printing press substrate correction device in one embodiment of the present invention; Figure 2 This is a schematic diagram of the substrate correction device for a digital printing machine from another angle according to the present invention; Figure 3 This is a three-dimensional structural diagram of the quick-release positioning component and the driving device in this invention. Figure 4 This is an exploded structural diagram of the quick-release positioning component and the driving device in this invention. Figure 5 This is a schematic diagram of the substrate correction assembly in this invention; Figure 6 This is a cross-sectional view of the substrate correction assembly in this invention; Figure 7 This is a cross-sectional view of the substrate correction assembly and the air pump, air inflator, and secondary tee connector in this invention. Figure 8 This is a cross-sectional view of the substrate correction assembly and the secondary adjustment part in this invention. Figure 9 This is a cross-sectional view of the secondary adjustment section in this invention.

[0022] In the diagram: 1. Device frame; 2. Support frame; 3. Bearing roller; 4. Sliding cylinder; 5. Bearing; 6. Positioning frame; 7. Fastener; 8. First motor; 9. Coupling; 10. Bearing frame; 11. Sliding frame; 12. Sliding bracket; 13. Clamping frame; 14. Bidirectional screw; 15. Adjusting nut; 16. Second motor; 17. Third motor; 18. Drive screw; 19. Drive nut; 20. Limit sleeve; 21. Rotating bracket; 22. Roller; 23. Annular plate; 24. Control valve; 25. Primary tee connector; 26. Air supply pipe; 27. Airbag; 28. Air pump; 29. ​​Inflation pipe; 30. Guide roller; 31. Lifting bracket; 32. Drive component; 33. Pressure roller; 34. Secondary tee connector. Detailed Implementation

[0023] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0025] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0028] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components.

[0030] Please see Figure 1 , Figure 2 This invention illustrates a substrate correction device for a digital printing machine according to an embodiment of the present invention. The device includes a frame 1, on which two support frames 2 are symmetrically and fixedly mounted. A carrier roller 3 is disposed between the two support frames 2. The device also includes a sliding cylinder 4, a quick-release positioning assembly, and a substrate correction assembly. A sliding cylinder 4 for placing the substrate is slidably mounted on the carrier roller 3. Quick-release positioning assemblies are installed on both support frames 2 to restrict the radial movement of the carrier roller 3. A driving device is also provided at one end of the carrier roller 3 for connecting to and transmitting power to that end. Figure 3 , Figure 4 As shown, the quick-release positioning assembly includes a bearing 5 and a positioning bracket 6. Two bearings 5 ​​are slidably mounted on the bearing roller 3. The two bearings 5 ​​are located on both sides of the sliding cylinder 4. The two bearings 5 ​​abut against the two support frames 2 respectively. The positioning bracket 6 is installed on both support frames 2 by fasteners 7. The fasteners 7 are preferably set as fastening screws and nuts. The bottom of the positioning bracket 6 is adapted to the outer ring of the bearing 5, which can fix the position of the bearing 5.

[0031] Among them, such as Figure 4 As shown, the drive device consists of a first motor 8 and a coupling 9. The coupling 9 is a quick-release type flexible plum blossom coupling 9. One end of the coupling 9 is connected to the output end of the first motor 8, and the other end of the coupling 9 is connected to the bearing roller 3.

[0032] It should be noted that, referring to the appendix Figure 4 As shown, two milled grooves are provided on both sides of the bearing roller 3 along the axial direction, and the sliding sleeve and the inner ring of the bearing 5 are provided with protruding ribs that match the milled grooves, thereby ensuring the smoothness of its sliding and facilitating transmission and installation.

[0033] Furthermore, the outer ring of bearing 5 is coaxially provided with an annular groove, and the bottom of the clamping frame 6 and the position where the support frame 2 mates with the outer ring of bearing 5 are provided with protruding ribs, which facilitates the assembly of bearing 5 and restricts the movement of the outer ring of bearing 5 in the axial, radial and circumferential directions.

[0034] When changing the substrate roll, first disconnect the coupling 9 to release the transmission connection between the motor and the bearing roller 3. Then loosen the fastener 7 on the support frame 2 and remove the positioning bracket 6. The bearing roller 3, along with the bearing 5, can then be pulled out from between the two support frames 2. After the new substrate roll is placed on the sliding drum 4, place the bearings 5 ​​at both ends of the bearing roller 3 on the two support frames 2 respectively. Cover the positioning bracket 6 and lock it with the fastener 7 to achieve radial positioning of the bearing roller 3. Finally, reconnect the quick-release flexible plum blossom coupling 9 to complete the installation and fix the axial position of the bearing roller 3. Then, the substrate on the sliding drum 4 can be introduced into the working position.

[0035] When calibrating the substrate feeding position, activate the substrate calibration component, adjust the position of the sliding cylinder 4 on the bearing roller 3, and then feeding can begin. During operation, the first motor 8 also needs to be activated, which drives the bearing roller 3 to rotate through the coupling 9. The bearing roller 3 drives the sliding cylinder 4 and the substrate roll to rotate synchronously to achieve material feeding. The bearing 5 ensures smooth rotation. The coupling 9 not only enables quick assembly and disassembly of the bearing roller 3, but also buffers the vibration during motor transmission, compensates for the slight coaxial deviation between the bearing roller 3 and the motor shaft, and avoids transmission jamming that affects the stability of substrate feeding.

[0036] The substrate alignment assembly is mounted on the device frame 1 and is used to clamp the sliding cylinder 4 and control the axial position between the sliding cylinder 4 and the carrying roller 3 when adjusting the substrate position, thereby adjusting the substrate position. Figures 5 to 9As shown, the substrate correction assembly includes a carrier frame 10, a sliding bracket 12, a primary adjustment part, and a secondary adjustment part. The carrier frame 10 is located below the carrier roller 3. A sliding frame 11 is slidably mounted on the carrier frame 10. Two sliding brackets 12 are symmetrically and slidably mounted on the sliding bracket 11. A clamping frame 13 is mounted on each sliding bracket 12. A primary adjustment part is installed inside the carrier frame 10 to adjust the position of the sliding bracket 11 on the carrier frame 10. A secondary adjustment part is installed on each of the two sliding brackets 12 to make small adjustments to the relative position of the sliding cylinder 4 and the carrier roller 3.

[0037] Among them, such as Figure 6 , Figure 7 As shown, a bidirectional screw 14 is rotatably installed inside the sliding frame 11. Two adjusting nuts 15 are symmetrically and threadedly fitted on the bidirectional screw 14. The two adjusting nuts 15 are fixedly connected to the two sliding brackets 12 respectively. A second motor 16 is fixedly installed on the sliding frame 11. The output end of the second motor 16 is fixedly connected to one end of the bidirectional screw 14.

[0038] After the bearing roller 3 is installed, when it is necessary to adjust the axial position of the sliding cylinder 4, the second motor 16 is started. The second motor 16 drives the bidirectional screw 14 to rotate. Since the threads on the bidirectional screw 14 are symmetrically arranged, the two adjusting nuts 15 will drive the two sliding brackets 12 to move synchronously in opposite directions along the sliding frame 11, thereby driving the two clamping frames 13 to move closer or further away synchronously, so as to clamp or release the sliding cylinder 4.

[0039] During clamping, the secondary adjustment parts on the two clamping frames 13 synchronously and symmetrically fit the annular plates 23 at both ends of the sliding cylinder 4 to ensure uniform clamping force and prevent the sliding cylinder 4 from shifting under force.

[0040] When released, the two clamping frames 13 separate without affecting the axial sliding and circumferential rotation of the sliding cylinder 4. The bidirectional screw 14 has high transmission accuracy and can precisely control the distance between the two sliding supports 12 to adapt to sliding cylinders 4 of different lengths. At the same time, the forward and reverse rotation of the second motor 16 can realize the rapid opening and closing of the clamping frames 13, improving the calibration efficiency.

[0041] The primary adjustment unit includes a third motor 17 and a drive screw 18, such as Figure 6 As shown, the third motor 17 is mounted on the support frame 10, and the drive screw 18 is rotatably mounted on the support frame 10. One end of the drive screw 18 is fixedly connected to the output end of the third motor 17. A drive nut 19 is threaded onto the drive screw 18, and the drive nut 19 is fixedly connected to the sliding frame 11.

[0042] When a significant adjustment of the substrate position is required, the third motor 17 is activated. The third motor 17 drives the drive screw 18 to rotate, and the drive nut 19 moves axially on the drive screw 18, thereby driving the sliding frame 11 to slide along the bearing frame 10. The sliding frame 11 drives the sliding cylinder 4 to make axial coarse adjustments on the bearing roller 3 through the sliding bracket 12 and the clamping frame 13 until the substrate offset is reduced to the preset range, at which point the third motor 17 can be turned off.

[0043] During the adjustment of the substrate position, the third motor 17 is controlled to rotate forward and backward according to the substrate offset direction, thereby realizing the rapid adjustment of the sliding cylinder 4 and adapting to the scenario of large substrate offset.

[0044] The secondary adjustment section includes a limiting sleeve 20 and an annular plate 23, such as Figure 8 , Figure 9 As shown, each clamping frame 13 has two symmetrically and fixedly installed limiting sleeves 20 inside. Each limiting sleeve 20 has a slidably installed rotating bracket 21 inside. Each rotating bracket 21 has a rotatably installed roller 22. Both ends of the sliding cylinder 4 have coaxially fixedly installed annular plates 23, which abut against the corresponding rollers 22. The system also includes control valves 24. Each clamping frame 13 has a control valve 24 installed on it. The output end of each control valve 24 is connected to a primary tee connector 25. Both output ends of 5 are connected to airbags 27 through air supply pipes 26. Several airbags 27 are located inside several limiting sleeves 20. The airbags 27 are fixedly installed inside the clamping frame 13. The airbags 27 are fixedly connected to the rotating bracket 21. When the airbags 27 are in the initial state, there is air inside, which ensures that the rollers 22 and the annular plate 23 maintain good support when they are in contact. When it is necessary to correct the feeding of the substrate, the position of the rotating bracket 21 in the limiting sleeve 20 is finely adjusted by controlling the pressure inside the airbags 27.

[0045] In order to supply gas to airbag 27, such as Figures 5 to 7 As shown, an air pump 28 is installed on the support frame 10. The output end of the air pump 28 is connected to two inflation pipes 29 through a two-stage tee connector 34. The two inflation pipes 29 are connected to the input end of the corresponding control valve 24.

[0046] After the initial adjustment of the substrate is completed, the air pump 28 is started. The gas generated by the air pump 28 is delivered to the control valve 24 through the two-stage three-way connector 34 and the air filling pipe 29. By adjusting the opening of the control valve 24, the inflation volume of the input airbag 27 is controlled, thereby adjusting the air pressure inside the airbag 27. When one side of the airbag 27 is inflated, it pushes the rotating bracket 21 to slide along the limiting sleeve 20. The rotating bracket 21 drives the roller 22 to push the annular plates 23 at both ends of the sliding cylinder 4, thereby realizing a slight axial movement of the sliding cylinder 4.

[0047] When the airbag 27 is deflated, the air pressure decreases. Under the tension of the substrate and the thrust of the airbag 27 on the other side, the rotating bracket 21 realizes the reverse fine adjustment of the sliding cylinder 4, thereby realizing the stepless fine adjustment of the substrate position until the substrate is completely aligned. The flexible support of the airbag 27 can avoid rigid impact on the sliding cylinder 4 and the annular piece 23 during fine adjustment, thus meeting the high-precision correction requirements of digital printing.

[0048] Furthermore, it can be adjusted in real time based on subtle changes in substrate offset, achieving dynamic fine-tuning.

[0049] To make the transport of the substrate more stable, such as Figure 1 , Figure 2 As shown, two guide rollers 30 are symmetrically and rotatably mounted on the device frame 1. A lifting bracket 31 is provided on the device frame 1. A driving component 32 is mounted on the device frame 1. The driving component 32 is preferably in the form of an electric cylinder. The output end of the driving component 32 is fixedly connected to the lifting bracket 31. Two pressure rollers 33 are symmetrically and rotatably mounted on the bottom of the lifting bracket 31. The two pressure rollers 33 correspond one-to-one with the two guide rollers 30 and are adapted to each other.

[0050] When guiding the substrate into the working position, the substrate passes between the guide roller 30 and the pressure roller 33. Then, the drive component 32 is activated, which drives the lifting bracket 31 to descend, so that the pressure roller 33 fits against the surface of the substrate and cooperates with the guide roller 30 to form a clamp. During the substrate conveying process, the guide roller 30 and the pressure roller 33 rotate synchronously, which plays a role in guiding the substrate to be conveyed smoothly and avoiding the substrate from shifting or bending.

[0051] Depending on the thickness of the substrate, the height of the lifting bracket 31 can be adjusted by the drive component 32 to change the distance between the pressure roller 33 and the guide roller 30, thus adapting to substrates of different thicknesses. The pressure roller 33 can be made of a flexible material to avoid damaging the surface of the substrate, while also improving the stability after correction and preventing the corrected substrate from shifting again.

[0052] The working principle or usage process of a digital printing press substrate correction device is as follows: When changing the substrate roll, first disconnect the coupling 9 to release the transmission connection between the motor and the bearing roller 3. Then loosen the fastener 7 on the support frame 2 and remove the positioning bracket 6. The bearing roller 3, along with the bearing 5, can then be pulled out from between the two support frames 2. After the new substrate roll is placed on the sliding cylinder 4, place the bearings 5 ​​at both ends of the bearing roller 3 on the two support frames 2. Cover the positioning bracket 6 and lock it with the fastener 7 to achieve radial positioning of the bearing roller 3. Finally, reconnect the quick-release flexible plum blossom coupling 9 to complete the installation and fix the axial position of the bearing roller 3.

[0053] When guiding the substrate into the working position, the substrate passes between the guide roller 30 and the pressure roller 33. Then, the drive component 32 is activated, which drives the lifting bracket 31 to descend, so that the pressure roller 33 fits against the surface of the substrate and cooperates with the guide roller 30 to form a clamp. During the substrate conveying process, the guide roller 30 and the pressure roller 33 rotate synchronously, which plays a role in guiding the substrate to be conveyed smoothly and avoiding the substrate from shifting or bending.

[0054] After the bearing roller 3 is installed, when it is necessary to adjust the axial position of the sliding cylinder 4, the second motor 16 is started. The second motor 16 drives the bidirectional screw 14 to rotate. Since the threads on the bidirectional screw 14 are symmetrically arranged, the two adjusting nuts 15 will drive the two sliding brackets 12 to move synchronously in opposite directions along the sliding frame 11, thereby driving the two clamping frames 13 to move closer or further away synchronously. When the rollers 22 on the two clamping frames 13 are respectively attached to the annular pieces 23 at both ends of the sliding cylinder 4 and are in a supporting state, the clamping of the sliding cylinder 4 can be completed, ensuring uniform clamping force and avoiding force deviation of the sliding cylinder 4.

[0055] When a significant adjustment of the substrate position is required, the third motor 17 can be started. The third motor 17 drives the drive screw 18 to rotate, and the drive nut 19 moves axially on the drive screw 18, thereby driving the sliding frame 11 to slide along the bearing frame 10. The sliding frame 11 drives the sliding cylinder 4 to make axial coarse adjustments on the bearing roller 3 through the sliding bracket 12 and the clamping frame 13 until the substrate offset is reduced to the preset range, at which point the third motor 17 can be turned off.

[0056] After the initial adjustment of the substrate is completed, the air pump 28 is started. The gas generated by the air pump 28 is delivered to the control valve 24 through the two-stage three-way connector 34 and the inflation pipe 29. The pressure control element on the control valve 24 controls the inflation of the airbags 27 in the two clamping frames 13, thereby controlling the inflation of the airbags 27 and adjusting the air pressure inside the airbags 27. When one side of the airbag 27 is inflated, it pushes the rotating bracket 21 to slide along the limiting sleeve 20. The rotating bracket 21 drives the roller 22 to push the annular plates 23 at both ends of the sliding cylinder 4, realizing a slight axial movement of the sliding cylinder 4. When the airbag 27 on this side is deflated, the air pressure decreases. Under the action of the substrate tension and the thrust of the airbag 27 on the other side, the rotating bracket 21 realizes the reverse fine adjustment of the sliding cylinder 4, thereby realizing stepless fine adjustment of the substrate position until the substrate is completely aligned. The flexible support of the airbag 27 can avoid rigid impact on the sliding cylinder 4 and the annular plates 23 during fine adjustment, thus completing the correction of the substrate.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of protection of the claims of the present invention.

Claims

1. A substrate correction device for a digital printing machine, comprising a device frame (1), wherein two support frames (2) are symmetrically and fixedly mounted on the device frame (1), and a bearing roller (3) is disposed between the two support frames (2), characterized in that, Also includes: The sliding cylinder (4) is slidably mounted on the bearing roller (3) for placing the substrate. The quick-release positioning assembly is installed on both of the support frames (2) to restrict the radial movement of the bearing roller (3). One end of the bearing roller (3) is also provided with a driving device to connect to one end of the bearing roller (3) and transmit power. The substrate correction assembly is mounted on the device frame (1) and is used to clamp the sliding cylinder (4) and control the axial position between the sliding cylinder (4) and the carrying roller (3) when adjusting the substrate position, thereby adjusting the substrate position.

2. The digital printing press substrate correction device according to claim 1, characterized in that, The quick-release positioning component includes: Bearing (5), two bearings (5) are slidably mounted on the bearing roller (3), the two bearings (5) are respectively located on both sides of the sliding cylinder (4), and the two bearings (5) respectively abut against the two support frames (2); The positioning frame (6) is installed on both of the support frames (2) by fasteners (7). The bottom of the positioning frame (6) is adapted to the outer ring of the bearing (5) and can fix the position of the bearing (5).

3. The digital printing press substrate correction device according to claim 2, characterized in that, The drive device consists of a first motor (8) and a coupling (9). One end of the coupling (9) is connected to the output end of the first motor (8), and the other end of the coupling (9) is connected to the bearing roller (3).

4. The digital printing press substrate correction device according to claim 1, characterized in that, The substrate correction assembly includes: The support frame (10) is located below the support roller (3), and a sliding frame (11) is slidably mounted on the support frame (10). Sliding bracket (12), two sliding brackets (12) are symmetrically and slidably installed on the sliding frame (11), and each sliding bracket (12) is equipped with a clamping frame (13). The first-level adjustment unit is installed inside the bearing frame (10) for adjusting the position of the sliding frame (11) on the bearing frame (10); The secondary adjustment section is installed on both of the sliding brackets (12) for slightly adjusting the relative position of the sliding cylinder (4) and the bearing roller (3).

5. The digital printing press substrate correction device according to claim 4, characterized in that, The sliding frame (11) is rotatably mounted with a bidirectional screw (14). Two adjusting nuts (15) are symmetrically and threadedly fitted on the bidirectional screw (14). The two adjusting nuts (15) are respectively fixedly connected to the two sliding brackets (12). A second motor (16) is fixedly mounted on the sliding frame (11). The output end of the second motor (16) is fixedly connected to one end of the bidirectional screw (14).

6. The digital printing press substrate correction device according to claim 5, characterized in that, The primary adjustment unit includes: The third motor (17) is mounted on the support frame (10); A drive screw (18) is rotatably mounted on the support frame (10). One end of the drive screw (18) is fixedly connected to the output end of the third motor (17). A drive nut (19) is threaded onto the drive screw (18), and the drive nut (19) is fixedly connected to the sliding frame (11).

7. A digital printing press substrate correction device according to claim 6, characterized in that, The secondary adjustment unit includes: The limiting sleeve (20) is symmetrically and fixedly installed inside each of the clamping frames (13). A rotating bracket (21) is slidably installed inside each of the limiting sleeves (20), and a roller (22) is rotatably installed on each of the rotating brackets (21). The annular plate (23) is coaxially fixed at both ends of the sliding cylinder (4), and the annular plate (23) abuts against the corresponding roller (22).

8. A digital printing press substrate correction device according to claim 7, characterized in that, It also includes control valves (24), each of the clamping frames (13) is equipped with a control valve (24), the output end of each control valve (24) is connected to a first-stage three-way connector (25), the two output ends of the first-stage three-way connector (25) are connected to airbags (27) through air supply pipes (26), a number of airbags (27) are respectively located inside a number of limiting sleeves (20), the airbags (27) are fixedly installed inside the clamping frame (13), the airbags (27) are fixedly connected to the rotating bracket (21), and the position of the rotating bracket (21) in the limiting sleeve (20) is finely adjusted by controlling the pressure inside the airbags (27).

9. A digital printing press substrate correction device according to claim 8, characterized in that, An air pump (28) is installed on the support frame (10). The output end of the air pump (28) is connected to two inflation pipes (29) through a two-stage three-way connector (34). The two inflation pipes (29) are connected to the input end of the corresponding control valve (24).

10. A digital printing press substrate correction device according to claim 9, characterized in that, Two guide rollers (30) are symmetrically and rotatably mounted on the device frame (1). A lifting bracket (31) is provided on the device frame (1). A driving component (32) is installed on the device frame (1). The output end of the driving component (32) is fixedly connected to the lifting bracket (31). Two pressure rollers (33) are symmetrically and rotatably mounted on the bottom of the lifting bracket (31). The two pressure rollers (33) correspond one-to-one with the two guide rollers (30) and are adapted to each other.

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