An on-line piezoelectric inkjet device for a gravure press

Abstract

The application discloses an online piezoelectric inkjet device for a gravure press, which comprises a production line, a gravure press arranged on the production line, a moving unit arranged on the production line, an inkjet element arranged on the gravure press and used for jetting ink on products on the production line, two groups of cleaning units symmetrically arranged on both sides of the inkjet element, and a power unit arranged between the cleaning units and the inkjet element.

Description

Technical Field

[0001] This invention relates to the field of inkjet technology for gravure printing machines, specifically to an online piezoelectric inkjet device for gravure printing machines. Background Technology

[0002] When inkjet printing QR codes, barcodes, and anti-counterfeiting codes onto products, piezoelectric printheads are generally used. However, because piezoelectric printheads are small, they are easily clogged by dust and other fibrous materials. In actual production, although clogging of a single printhead does not affect the code's recognition, it does affect the product's quality.

[0003] Currently, when the above situation occurs, the usual method is to install two sets of inkjet units in the front and back for operation. When the printheads in one set are heavily clogged, the other set is used. Only when both sets have a large number of clogged printheads will the clogged printheads be cleaned at the same time. Although this will extend the frequency of downtime for cleaning, it is still unavoidable to stop for cleaning. Because when the gravure printing line is working, the front end is also printing patterns and designs on other parts of the product. At the same time, because the line itself is working at a high speed, each downtime for repair will cause significant product loss during the recovery to working speed. Therefore, we have designed an online piezoelectric inkjet device that does not stop the machine.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of this invention is to provide an online piezoelectric inkjet device for gravure printing machines, so as to solve the problem mentioned in the background art that when the printhead of a gravure printing machine becomes clogged, it is necessary to stop the machine for treatment, resulting in significant product loss.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an online piezoelectric inkjet device for a gravure printing machine, comprising a production line and a gravure printing machine disposed on the production line, and further comprising:

[0007] A moving unit is installed on the production line to place the gravure printing machine and drive the gravure printing machine to move laterally on the production line.

[0008] Inkjet components, installed on gravure printing machines, are used to spray ink onto products on the production line;

[0009] The inkjet component includes:

[0010] The inkjet cartridge is slidably mounted on the gravure printing machine;

[0011] Multiple inkjet heads are arranged in two groups and crosswise on the inkjet cartridge;

[0012] Two sets of cleaning units are symmetrically arranged on both sides of the inkjet unit to clean clogged inkjet heads;

[0013] The power unit, located between the cleaning unit and the inkjet unit, is used to drive either set of cleaning units to move and the inkjet unit to move synchronously. This allows the cleaning unit to clean the clogged inkjet head. At the same time, while the power unit drives the inkjet unit to move to one side to clean through the cleaning unit, it works in conjunction with the moving unit to drive the gravure printing machine to the other side, thus ensuring that the inkjet unit is always facing the ink-to-print area of ​​the product.

[0014] Preferably, the moving unit includes:

[0015] Mobile racks are installed on the assembly line;

[0016] The rotating belt, mounted on the movable frame and connected to the gravure printing machine, is used to drive the gravure printing machine to move laterally.

[0017] Preferably, the cleaning unit includes:

[0018] The cleaning box is located on one side of the inkjet component and is slidably mounted on the gravure printing machine via a connecting bracket;

[0019] The cleaning plates are evenly distributed inside the cleaning box, and collection grooves are formed between adjacent cleaning plates and between the cleaning plates and the inner wall of the cleaning box. These grooves are used to collect the ink remaining in the inkjet head after the cleaning plates have cleaned the clogged inkjet head.

[0020] Preferably, the inkjet cartridge is symmetrically provided with two sets of cleaning sections at both ends, which are used to clean any remaining blockages on the upper end of the cleaning plate during the resetting process after the cleaning plate cleans the clogged inkjet head.

[0021] Preferably, the cleaning unit includes:

[0022] The cleaning rollers are located on both sides of the inkjet cartridge. A connecting plate is fixedly installed on the inkjet cartridge. A sliding groove is provided on the connecting plate to connect the roller shaft of the cleaning roller so that the roller shaft can slide up and down in the sliding groove.

[0023] The guide assembly is located at the inkjet cartridge position on the gravure printer. When the inkjet cartridge slides to one side, the cleaning roller slides upward in the chute to disengage it from the cleaning plate. After the inkjet cartridge moves the shortest distance past the cleaning cartridge, it slides downward to the initial position and continues to move. When the cleaning roller resets, it moves with the inkjet cartridge at the bottom of the chute and rotates to contact and clean the upper surface of the cleaning plate.

[0024] Preferably, the guiding component includes:

[0025] The guide groove is set on the inner wall of the gravure printing machine and is used to clean the roller shaft to slide in the guide groove during the movement of the inkjet cartridge.

[0026] The pressing element, located within the chute, is used to press down the cleaning roller;

[0027] A rotating component is provided between the guide groove and the roller shaft of the cleaning roller, which is used to drive the cleaning roller to rotate as the inkjet cartridge moves, so as to achieve the cleaning effect on the cleaning sheet.

[0028] A lifting element is located below the roller shaft at the chute position. When the inkjet cartridge initially moves, it lifts the roller shaft once, providing an upward force when the cleaning roller begins to move, so that the cleaning roller can slide from the upper channel of the guide groove during the initial movement.

[0029] Preferably, the pressing component includes a collar sleeved on the roller shaft of the cleaning roller, and an elastic telescopic rod is provided on the collar, the elastic telescopic rod being fixedly mounted on the connecting plate.

[0030] Preferably, a toothed groove is provided on the inner wall of the guide groove, and a second gear that meshes with the toothed groove is provided on the roller shaft of the cleaning roller.

[0031] Preferably, the gravure printing machine and the movable frame are provided with movable wheels at the connection point, and the movable frame is provided with wheel rails for the movable wheels to slide on.

[0032] Preferably, the power unit includes:

[0033] The first rack is mounted on the inkjet cartridge;

[0034] Two first gears are rotatably mounted on the gravure printing machine and are located at both ends of the first rack and mesh with it;

[0035] Two second racks are respectively mounted on the cleaning unit and mesh with two first gears respectively;

[0036] The power gear meshes with the first rack and is connected to a power component via a gear shaft.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] This invention adds a moving unit to the production line and sets up a cleaning unit and a power unit on the gravure printing machine. The clogged printhead on the inkjet part is moved to the cleaning unit for cleaning. At the same time, the position of the inkjet part can be adjusted and cleaned without changing the inkjet part's spraying position, so as not to affect normal operation and achieve the effect of cleaning without stopping the machine. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 This is a schematic diagram showing the connection between the gravure printing machine and the moving unit of the present invention;

[0041] Figure 3 This is a cross-sectional view of the power unit of the present invention;

[0042] Figure 4 This is a top view of the inkjet component of the present invention;

[0043] Figure 5 This is a structural diagram of the cleaning box of the present invention;

[0044] Figure 6 This is a flowchart illustrating the movement of the second gear within the guide groove according to the present invention.

[0045] Figure 7 for Figure 1 Enlarged view of point A in the middle;

[0046] Figure 8 for Figure 2 Enlarged view at point B in the middle;

[0047] Figure 9 for Figure 4 Enlarged view at point C;

[0048] Figure 10 for Figure 8 Enlarged view of point D in the middle.

[0049] Reference numerals: 1-Production line; 2-Gravure printing machine; 3-Moving unit; 31-Moving frame; 32-Rotating belt; 33-Moving wheel; 34-Wheel rail; 4-Inkjet component; 41-Inkjet cartridge; 42-Inkjet head; 421-Working printhead; 422-Temporary printhead; 5-Cleaning unit; 51-Cleaning box; 52-Cleaning plate; 53-Collection trough; 54-Cleaning section; 541-Cleaning roller; 542-Connecting plate; 543-Groove; 544 - Roller shaft; 545 Guide assembly; 546 Guide groove; 5461 Adjustment groove; 547 Pressing element; 5471 Collar; 5472 Elastic telescopic rod; 548 Rotating element; 5481 Tooth groove; 5482 Second gear; 549 Lifting element; 6 Power unit; 61 First rack; 62 First gear; 63 Second rack; 64 Power gear; 65 Power element; 7 Product; 71 Inkjet printing area. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Please see Figure 1-4 8, 9, The present invention provides a technical solution: an online piezoelectric inkjet device for a gravure printing machine, comprising a production line 1 and a gravure printing machine 2 disposed on the production line 1, and further comprising:

[0052] The moving unit 3 is set on the production line 1 to place the gravure printing machine 2 and drive the gravure printing machine 2 to move laterally on the production line 1. This lateral movement is perpendicular to the transmission direction of the production line 1.

[0053] Inkjet component 4 is mounted on gravure printing machine 2 and is used to spray ink onto product 7 on production line 1.

[0054] The inkjet component 4 includes:

[0055] Inkjet cartridge 41 is slidably mounted on gravure printing machine 2;

[0056] Multiple inkjet heads 42 are arranged in two groups and crosswise on the inkjet cartridge 41;

[0057] Two sets of cleaning units 5 are symmetrically arranged on both sides of the inkjet component 4 to clean the clogged inkjet head 42;

[0058] The power unit 6 is located between the cleaning unit 5 and the inkjet component 4. It is used to drive either of the cleaning units 5 to move and the inkjet component 4 to move synchronously. This allows the cleaning unit 5 to clean the clogged inkjet head 42. At the same time, when the power unit 6 drives the inkjet component 4 to move to one side to clean it through the cleaning unit 5, it works in conjunction with the moving unit 3 to drive the gravure printer 2 to move to the other side. This ensures that the inkjet component 4 is always facing the ink-to-ink area 71 of the product 7.

[0059] In practical use, such as Figure 9As shown, the inkjet heads 42 on the inkjet unit 4 are arranged in a row on the inkjet cartridge 41. The number of inkjet heads 42 is enlarged for display. During inkjet operation, the inkjet heads 42 located in the central area of ​​the inkjet cartridge 41 are the working printheads 421 in normal condition. The temporary adjustment printheads on both sides are temporary printheads 422 used for cleaning when the working printheads 421 become clogged. When the working printheads 421 become clogged, the power unit 6 drives the cleaning unit 5 located near the working printhead 421 to move towards the clogged printhead 421 and clean it. During this process, the power unit 6 drives the cleaning unit 5 to move. The process is segmented, meaning that the distance that the power unit 6 drives the cleaning unit 5 to move once is the interval between two adjacent, intersecting inkjet heads 42. After the power unit 6 drives the cleaning unit 5 to move once, the moving unit 3 will simultaneously drive the gravure printer 2 to move the same distance in the other direction. In addition, after one movement, the working printhead 421 that has moved out of the inkjet area stops working and the temporary printhead 422 that has moved to the inkjet area starts working. The above actions are repeated until the cleaning unit 5 contacts and cleans the clogged inkjet head 42. Then the above principle is repeated in the opposite direction until it returns to the initial position and the cleaning is completed without stopping the machine.

[0060] Please see Figure 1 , 7 The moving unit 3 includes:

[0061] Mobile frame 31 is mounted on assembly line 1;

[0062] The rotating belt 32 is rotatably mounted on the movable frame 31 and connected to the gravure printing machine 2, and is used to drive the gravure printing machine 2 to move laterally.

[0063] Please see Figure 1 , 2 5, 7, the cleaning unit 5 includes:

[0064] The cleaning box 51 is located on one side of the inkjet component 4 and is slidably mounted on the gravure printer 2 via a connecting bracket;

[0065] Cleaning discs 52 are evenly distributed in the cleaning box 51, and a collection groove 53 is formed between adjacent cleaning discs 52 and between the cleaning discs 52 and the inner wall of the cleaning box. This groove is used to collect the ink remaining in the inkjet head 42 after the cleaning discs 52 have cleaned the clogged inkjet head 42. During cleaning, the cleaning discs 52 scrape the clogged inkjet head 42, and the inkjet head 42 discharges ink to cooperate, thereby removing the blockage.

[0066] Each of the collection tanks 53 is provided with an ink outlet hole penetrating the cleaning box 51. A pump is connected to the collection tank 53 via a connecting pipe. After cleaning, the ink in the collection tank 53 can be extracted and recycled by the pump to prevent excessive ink residue in the collection tank 53 of the cleaning box 51, which would affect subsequent cleaning. In addition, the upper surface of the cleaning plate 52 is higher than the cleaning box 51 and slightly higher than the lower outlet of the inkjet head 42. At the same time, the height of the left and right side walls of the cleaning box 51 is lower than the outlet of the inkjet head 42 so that the cleaning plate 52 can contact the inkjet head 42 and the ink can flow into the collection tank 53. In order to achieve better cleaning effect, the upper part of the cleaning plate 52 is provided with a concave-convex part. The concave-convex part can be set as a serrated or corrugated part to facilitate contact with the inner hole of the inkjet head 42. The cleaning of the blocked inkjet head 42 is achieved by scraping the upper part of the cleaning plate 52. The cleaning plate 52 is made of a thin flexible rubber material.

[0067] Please see Figure 3 , 4 The inkjet cartridge 41 is symmetrically provided with two sets of cleaning sections 54 at both ends, which are used to clean any blockages that may remain on the upper end of the cleaning section 52 during the reset process after the cleaning section 52 cleans the clogged inkjet head 42.

[0068] Please see Figure 8 , 10 The cleaning unit 54 includes:

[0069] Cleaning rollers 541 are located on both sides of inkjet cartridge 41. A connecting plate 542 is fixedly installed on the inkjet cartridge 41. A sliding groove 543 is provided on the connecting plate 542 for connecting the roller shaft 544 of the cleaning rollers 541 so that the roller shaft 544 can slide up and down in the sliding groove 543.

[0070] The guide assembly 545 is located at the position of the inkjet cartridge 41 in the gravure printer 2. When the inkjet cartridge 41 slides to one side, the cleaning roller 541 slides upward in the slide groove 543 to disengage it from the cleaning plate 52. After the inkjet cartridge 41 moves the shortest distance past the cleaning cartridge 51, it slides downward to the initial position and continues to move. When the cleaning roller 541 is reset, it moves with the inkjet cartridge 41 at the lowest position of the slide groove 543 and rotates to contact and clean the upper surface of the cleaning plate 52. The shortest distance is the distance from the working nozzle 421 at the end to the adjacent cleaning unit 5.

[0071] Please see Figure 6 , 8 10, the guide component 545 includes:

[0072] The guide groove 546 is provided on the inner wall of the gravure printing machine 2, and is used for the cleaning roller 541 and roller shaft 544 to slide in the guide groove 546 during the movement of the inkjet cartridge 41.

[0073] Pressing element 547 is disposed in slide groove 543 and is used to press down cleaning roller 541;

[0074] The rotating component 548 is positioned between the guide groove 546 and the roller shaft 544 of the cleaning roller 541, and is used to drive the cleaning roller 541 to rotate as the inkjet cartridge 41 moves, so as to achieve the cleaning effect on the cleaning plate 52.

[0075] A lifting component 549 is provided below the roller shaft 544 at the position of the chute 543. When the ink cartridge 41 initially moves, it will lift the roller shaft 544 once, providing an upward force when the cleaning roller 541 starts to move, so that the cleaning roller 541 can slide from the upper channel of the guide groove 546 when it initially moves. The lifting component 549 can be set as a lifting cylinder.

[0076] When the guide assembly 545 is working, the inkjet cartridge 41 moves toward the cleaning unit 5. At this time, the cleaning roller 541 moves accordingly. When the cleaning roller 541 moves to one side, it moves upward along the slide groove 543 due to the limit of the guide groove 546. When it moves the shortest distance, that is, at the top of the guide groove 546, the pressing member 547 will press the cleaning roller 541 down to the bottom of the guide groove 546. At this time, the inkjet cartridge 41 continues to move until the blocked inkjet head 42 is cleaned. Then the inkjet cartridge 41 moves back to the initial position. During this process, the cleaning roller 541 will rotate under the action of the rotating member 548, thereby achieving the cleaning effect.

[0077] Please see Figure 10 The pressing member 547 includes a collar 5471 sleeved on the roller shaft 544 of the cleaning roller 541, and an elastic telescopic rod 5472 is provided on the collar 5471. The elastic telescopic rod 5472 is fixedly mounted on the connecting plate 542.

[0078] As the inkjet cartridge 41 moves to one side, the elastic telescopic rod 5472 on the pressing member 547 is compressed. When it moves to the uppermost end of the guide groove 546, the compressed elastic telescopic rod 5472 will press the cleaning roller 541 down and into the track of the guide groove 546 for further forward movement and return.

[0079] Please see Figure 6 The rotating component 548 includes: a toothed groove 5481 on the inner wall of the guide groove 546, and a second gear 5482 that meshes with the toothed groove 5481 on the roller shaft 544 of the cleaning roller 541.

[0080] When the inkjet cartridge 41 moves, the second gear 5482 slides in the guide groove 546 due to the action of the tooth groove 5481, thereby driving the cleaning roller 541 to rotate and cleaning the cleaning plate 52.

[0081] Please see Figure 7 The gravure printing machine 2 and the movable frame 31 are provided with a movable wheel 33, and the movable frame 31 is provided with a wheel rail 34 for the movable wheel 33 to slide on. By setting the movable wheel 33 and the wheel rail 34, the lateral movement resistance of the gravure printing machine 2 can be reduced.

[0082] Please see Figure 3 The power unit 6 includes:

[0083] The first rack 61 is mounted on the inkjet cartridge 41;

[0084] Two first gears 62 are rotatably mounted on the gravure printing machine 2 and are located at both ends of the first rack 61 and mesh with it;

[0085] Two second racks 63 are respectively disposed on the cleaning unit 5 and respectively mesh with two first gears 62;

[0086] The power gear 64 meshes with the first rack 61 and is connected to a power component 65 via a gear shaft. The power component 65 is a rotary motor, which is fixedly installed inside the gravure printing machine 2.

[0087] During operation, the power unit 65 drives the power gear 64 to rotate, which in turn drives the first rack 61 to move, thereby moving the inkjet cartridge 41 to one side. At the same time, through the second rack 63 and the first gear 62, the cleaning unit 5 on one side of the inkjet cartridge 41 moves synchronously towards the inkjet cartridge 41. The cleaning unit 5 on the other side disengages from the first gear 62 due to the movement of the first rack 61, thus moving the cleaning unit 5 to the inkjet cartridge 41 to clean the clogged printhead 42. Through this power unit 6, the cleaning units 5 on both sides can be moved synchronously, so that the appropriate cleaning unit 5 can be selected according to the position of the clogged printhead 42. At the same time, this synchronous movement can reduce the distance that the inkjet component 4 moves, thereby making the cleaning speed faster.

[0088] Because of the configuration of the power unit 6, the guide groove 546 on the corresponding cleaning part 54 will have an adjustment groove 5461 connected to the guide groove 546 at its right end, which is used for the sliding of the cleaning roller 541 when the cleaning unit 5 on the other side moves a distance due to the movement of the first rack 61 and disengages from the first gear 62.

[0089] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0090] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online piezoelectric inkjet device for a gravure printing machine, comprising a production line (1) and a gravure printing machine (2) disposed on the production line (1), characterized in that, Also includes: The moving unit (3) is set on the production line (1) to place the gravure printing machine (2) and drive the gravure printing machine (2) to move laterally on the production line (1); The inkjet component (4) is installed on the gravure printing machine (2) and is used to spray ink onto the products (7) on the production line (1); The inkjet component (4) includes: The inkjet cartridge (41) is slidably mounted on the gravure printing machine (2); Multiple inkjet heads (42) are arranged in two groups and crosswise on the inkjet cartridge (41); Two sets of cleaning units (5) are symmetrically arranged on both sides of the inkjet component (4) to clean the clogged inkjet head (42); The power unit (6) is located between the cleaning unit (5) and the inkjet part (4) to drive either of the cleaning units (5) to move and the inkjet part (4) to move synchronously, so that the cleaning unit (5) can clean the blocked inkjet head (42). At the same time, when the power unit (6) drives the inkjet part (4) to move to one side to clean through the cleaning unit (5), it cooperates with the moving unit (3) to drive the gravure printer (2) to move to the other side, so that the inkjet part (4) is always facing the ink-to-ink area (71) of the product (7). The cleaning unit (5) includes: The cleaning box (51) is located on one side of the inkjet part (4) and is slidably mounted on the gravure printer (2) via a connecting frame; Cleaning plates (52) are evenly distributed in the cleaning box (51), and a collection groove (53) is formed between adjacent cleaning plates (52) and between the cleaning plates (52) and the inner wall of the cleaning box. This groove is used to collect the ink remaining in the inkjet head (42) after the cleaning plates (52) have cleaned the clogged inkjet head (42). The inkjet cartridge (41) is symmetrically provided with two sets of cleaning sections (54) at both ends, which are used to clean the blockage that may remain on the upper end of the cleaning plate (52) during the reset process after the cleaning plate (52) cleans the blocked inkjet head (42). The cleaning unit (54) includes: The cleaning roller (541) is located on both sides of the inkjet cartridge (41). A connecting plate (542) is fixedly installed on the inkjet cartridge (41). A groove (543) is provided on the connecting plate (542) for connecting the roller shaft (544) of the cleaning roller (541) so that the roller shaft (544) can slide up and down in the groove (543). The guide assembly (545) is located at the position of the inkjet cartridge (41) on the gravure printing machine (2). When the inkjet cartridge (41) slides to one side, the cleaning roller (541) slides upward in the groove (543) to disengage from the cleaning plate (52). After the inkjet cartridge (41) moves the shortest distance past the cleaning cartridge (51), it slides downward to the initial position and continues to move. When the cleaning roller (541) is reset, it moves with the inkjet cartridge (41) at the lowest position of the groove (543) and rotates to contact and clean the upper surface of the cleaning plate (52).

2. The online piezoelectric inkjet device for a gravure printing machine according to claim 1, characterized in that, The moving unit (3) includes: A mobile frame (31) is installed on the assembly line (1); Rotate belt (32), which is rotatably mounted on the movable frame (31) and connected to the gravure printing machine (2), to drive the gravure printing machine (2) to move laterally.

3. The online piezoelectric inkjet device for a gravure printing machine according to claim 1, characterized in that, The guide component (545) includes: The guide groove (546) is set on the inner wall of the gravure printing machine (2) and is used to allow the cleaning roller (541) shaft (544) to slide in the guide groove (546) during the movement of the inkjet cartridge (41); The pressing element (547) is disposed in the groove (543) and is used to press down the cleaning roller (541); The rotating part (548) is located between the guide groove (546) and the roller shaft (544) of the cleaning roller (541), and is used to drive the cleaning roller (541) to rotate when the inkjet cartridge (41) moves, so as to achieve the cleaning effect on the cleaning plate (52); A lifting element (549) is provided below the roller shaft (544) at the location of the chute (543). When the ink cartridge (41) initially moves, it will lift the roller shaft (544) once, providing an upward force when the cleaning roller (541) starts to move, so that the cleaning roller (541) can slide from the upper channel of the guide groove (546) during the initial movement.

4. The online piezoelectric inkjet device for a gravure printing machine according to claim 3, characterized in that, The pressing component (547) includes a collar (5471) sleeved on the roller shaft (544) of the cleaning roller (541), and an elastic telescopic rod (5472) is provided on the collar (5471), and the elastic telescopic rod (5472) is fixedly installed on the connecting plate (542).

5. The online piezoelectric inkjet device for a gravure printing machine according to claim 3, characterized in that, The rotating component (548) includes: a toothed groove (5481) on the inner wall of the guide groove (546), and a second gear (5482) that meshes with the toothed groove (5481) is provided on the roller shaft (544) of the cleaning roller (541).

6. The online piezoelectric inkjet device for a gravure printing machine according to claim 2, characterized in that, The gravure printing machine (2) and the movable frame (31) are connected by a movable wheel (33), and the movable frame (31) is provided with a wheel rail (34) for the movable wheel (33) to slide.

7. The online piezoelectric inkjet device for a gravure printing machine according to claim 1, characterized in that, The power unit (6) includes: The first rack (61) is mounted on the inkjet cartridge (41); Two first gears (62) are rotatably mounted on the gravure printing machine (2) and located at both ends of the first rack (61) and meshing with it; Two second racks (63) are respectively disposed on the cleaning unit (5) and respectively mesh with two first gears (62); The power gear (64) meshes with the first rack (61) and is connected to the power component (65) via the gear shaft.

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