A cam phase difference superimposition compensation mechanism of a multi-color printing machine

Abstract

The utility model relates to printing equipment technical field discloses a cam phase difference superposition compensation mechanism of multicolor printing machine, including printing frame, the top of printing frame is installed with correction mechanism, the bottom fixed connection of printing frame has the supporting plate, the outer wall of supporting plate is installed with tension adjusting mechanism, the correction mechanism includes sealing box no.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, and in particular to a cam phase difference overprinting compensation mechanism for a multicolor printing machine. Background Technology

[0002] A multicolor printing press is a printing device capable of printing multiple colors of text and images sequentially or simultaneously on a substrate. It is widely used in packaging printing, book printing, commercial printing, and other fields. It typically consists of multiple printing units, with each color group corresponding to the printing of one color. By arranging these color groups in a reasonable manner, the substrate passes through different color groups sequentially during transport, completing the superposition printing of multiple colors and ultimately forming a printed product with rich colors and distinct layers.

[0003] A search revealed Chinese Patent Publication No. CN202322195720.5, which discloses a tension adjustment mechanism for a six-color flexographic printing machine. The mechanism includes a six-color flexographic printing machine frame. A groove is formed at the outer end of the frame, and a guide groove is formed on the inner wall of the groove. A guide wheel is movably connected inside the groove, and a tension roller is fixedly connected to the outer end of the guide wheel. A gear is fixedly connected to the outer end of the tension roller. Through this gear and rack design, adjusting the tension of the substrate only requires adjusting the distance between the traction roller and the tension roller. Therefore, only external force is needed to rotate the guide wheel, which drives the gear to rotate, and then drives the gear to move up and down along the rack, thereby raising and lowering the tension roller to adjust the tension of the substrate. The operation is very simple, and the guide wheel moves along the guide groove, ensuring smooth movement of the tension roller during raising and lowering.

[0004] The aforementioned patent mentions the beneficial effects: "By setting a tension adjustment mechanism, the distance between the traction roller and the tension roller can be adjusted. Therefore, only the guide wheel needs to be rotated under external force, thereby driving the gear to rotate, which in turn drives the gear to move up and down along the rack, thereby driving the tension roller to rise and fall, adjusting the tension of the substrate. The operation is very simple. The guide wheel will move along the guide groove, thus ensuring the smooth function of the tension roller during rising and falling." Although the above solution solves the problem of registration deviation caused by expansion, wrinkling, or slack during the printing process, in the prior art, although the tension adjustment mechanism can reduce the registration deviation caused by material expansion and contraction by controlling the tension of the substrate, it is difficult to solve the phase difference problem caused by factors such as the mechanical transmission clearance of the printing plate cylinder itself, processing and installation errors, and inertial fluctuations during high-speed operation. This makes it easy for printing plate cylinders of different color groups to misalign during rotation, resulting in difficulty in accurately superimposing the colors, and defects such as ghosting, blurring, and color misalignment in the printed matter. Therefore, a cam phase difference superimposition compensation mechanism for a multi-color printing press is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a cam phase difference overprinting compensation mechanism for a multicolor printing machine, which aims to improve the problems of inaccurate overprinting in the prior art, resulting in ghosting, blurring, and color misalignment in printed materials.

[0006] The patch inductor magnetic cover structure provided in this application adopts the following technical solution:

[0007] A cam phase difference overprint compensation mechanism for a multicolor printing machine includes a printing frame, a correction mechanism installed at the top of the printing frame, a support plate fixedly connected to the bottom of the printing frame, and a tension adjustment mechanism installed on the outer wall of the support plate.

[0008] The correction mechanism includes a sealing box, the bottom of which is fixedly connected to the top of the printing frame. A cylinder is fixedly connected to the inner wall of the sealing box, a rack is fixedly connected to the drive end of the cylinder, a connecting rod is rotatably connected to the inner wall of the sealing box, a gear is fixedly connected to the top of the connecting rod, an eccentric wheel is fixedly connected to the bottom of the connecting rod, a fixing block is fixedly connected to the adjacent side of the printing frame, and a guide assembly is installed at the bottom of the fixing block.

[0009] Through the above technical solution: the correction mechanism drives rack one through cylinder one, which drives gear one and eccentric wheel to rotate, pushing the guide component to adjust the position of the printing roller and realize the correction of printing deviation. The tension adjustment mechanism drives rack two through cylinder two, which drives gear two and connecting plate to rotate and adjust the position of tension roller to realize the adjustment of material tension. The two work together to prevent overprinting deviation and material relaxation, and ensure the accuracy and quality of multi-color printing.

[0010] Preferably, the two guide components include two fixing plates, the bottom ends of the two fixing plates are fixedly connected to the top ends of the two fixing blocks one, the inner walls of the two fixing plates are slidably connected with guide rods, the outer walls of the two guide rods are sleeved with springs, and the far sides of the two guide rods are fixedly connected with fixing blocks two.

[0011] The above technical solution involves a fixing plate fixed to a fixing block one for support, a guide rod sliding along its inner wall and elastically returning to its original position via a spring, and a fixing block two moving with the guide rod to contact the printing roller. This assembly works together to achieve elastic adjustment and automatic reset of the printing roller position, preventing overprinting deviations caused by vibration or phase differences during printing and ensuring printing accuracy.

[0012] Preferably, the tension adjustment mechanism includes a second sealing box, with each adjacent side of the second sealing box fixedly connected to the outer wall of one of the support plates. A second cylinder is fixedly connected to the inner wall of each second sealing box, and a rack is fixedly connected to the drive end of each second cylinder. A second connecting rod is rotatably connected to the inner walls of both support plates, and a gear is fixedly connected to the outer wall of one of the second connecting rods. A connecting plate is fixedly connected to each adjacent side of the two second connecting rods.

[0013] The above technical solution involves: a sealed box 2 fixed to a support plate supporting cylinder 2; cylinder 2 driving rack 2 to drive gear 2; gear 2, through connecting rod 2, causing the connecting plate to rotate and adjusting the position of the tension roller. These components work together to dynamically adjust the tension of the printing material, preventing wrinkles, misalignment, or misregistration caused by uneven tension, thus ensuring the registration accuracy and quality stability of multi-color printing.

[0014] Preferably, printing rollers are rotatably connected to the adjacent sides of the two fixed blocks one, traction rollers are fixedly connected to the adjacent sides of the two printing frames, the distant sides of the two fixed blocks two are in contact with the outer walls of the two eccentric wheels, and the adjacent sides of the two fixed blocks two are in contact with the left and right ends of the printing rollers.

[0015] Through the above technical solution: Fixed block one supports the rotation of the printing roller, which is responsible for printing; the traction roller is fixed by the printing frame and pulls the material for transmission; Fixed block two contacts the eccentric wheel on one side to receive the adjustment force, and contacts the printing roller on the other side to adjust its position. The components work together to realize material transmission and printing position correction, prevent overprinting deviation caused by phase difference, and ensure printing accuracy.

[0016] Preferably, the outer teeth of the two racks are meshed with the outer teeth of the two gears, and the outer walls of the two racks are slidably connected to the inner walls of the two sealing boxes.

[0017] Through the above technical solution: rack one meshes with gear one to transmit power, rack one slides along the inner wall of sealed box one, and sealed box one serves as a guide. The two work together to convert the linear motion of cylinder one into the rotational motion of gear one, realizing power conversion and stable transmission, preventing transmission deviation or jamming, and ensuring the efficient operation of the correction mechanism.

[0018] Preferably, one end of each of the two springs is fixedly connected to the opposite side of the two fixed plates, and the other end of each of the two springs is fixedly connected to the adjacent side of the two fixed blocks.

[0019] The above technical solution involves connecting a fixed plate and a second fixed block to the two ends of the spring, providing an elastic restoring force to the second fixed block. When the eccentric wheel pushes the second fixed block, the spring is compressed and stores energy. After the eccentric wheel moves away, the spring releases energy, causing the second fixed block to return to its original position.

[0020] Preferably, a tension roller is rotatably connected to one side of the two connecting plates, and the outer teeth of the second gear are meshed with the outer teeth of the second rack.

[0021] Through the above technical solution: the connecting plate supports the rotation of the tension roller, adjusts the material tension, and the gear two meshes with the rack two, converting the linear motion of the cylinder two into the rotational motion of the connecting rod two, which drives the connecting plate to swing.

[0022] Preferably, the outer wall of the rack two is slidably connected to the inner wall of the sealing box two, and the outer wall of one of the connecting rods two is rotatably connected to the inner wall of the sealing box two;

[0023] Through the above technical solution: rack 2 slides along the inner wall of sealing box 2, sealing box 2 provides guidance for it to ensure linear motion stability, and connecting rod 2 rotates on the inner wall of sealing box 2 to obtain reliable support.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. In this utility model, when the correction mechanism is working, cylinder one drives rack one to move, which in turn drives gear one and connecting rod one to rotate, causing eccentric wheel to press fixed block two, guide rod to slide and compress spring, spring to reset and drive components to return to their positions, thus completing the correction of the printing material position. The phase difference of printing plate cylinder, mechanical transmission error, and positional offset caused by slight deformation of the substrate are detected and precisely adjusted in real time to ensure that the images and text of different color groups can be accurately superimposed, effectively avoiding defects such as ghosting, color misalignment, and blurry images and text. At the same time, it can enhance the equipment's adaptability to substrates of different materials and reduce the impact of material differences or environmental changes.

[0026] 2. In this utility model, the cylinder 2 inside the sealed box 2 drives the rack 2 to move, which in turn drives the gear 2 and the connecting rod 2 to rotate. This causes the connecting plate to adjust the position of the tension roller, thus achieving coordinated tension control of the material and effectively improving printing quality and production efficiency. It can monitor and control the tension of the substrate in real time, avoiding stretching, shrinkage, or wrinkling of the substrate due to unstable tension. This ensures accurate registration of multi-color images and text, reduces ghosting and misalignment, and improves the color consistency and pattern accuracy of printed materials. Attached Figure Description

[0027] Figure 1 This is a three-dimensional schematic diagram of a cam phase difference overprinting compensation mechanism for a multicolor printing machine proposed in this utility model.

[0028] Figure 2 This is a schematic diagram of the printing frame of a cam phase difference overprinting compensation mechanism for a multicolor printing machine proposed in this utility model.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle

[0030] Figure 4 This is a schematic diagram of the support plate of a cam phase difference overprinting compensation mechanism for a multicolor printing machine proposed in this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Printing frame; 2. Correction mechanism; 21. Sealing box one; 22. Cylinder one; 23. Rack one; 24. Connecting rod one; 25. Gear one; 26. Eccentric wheel; 27. Fixing block one; 28. Guide assembly; 281. Fixing plate; 282. Guide rod; 283. Spring; 284. Fixing block two; 3. Support plate; 4. Tension adjustment mechanism; 41. Sealing box two; 42. Cylinder two; 43. Rack two; 44. Connecting rod two; 45. Gear two; 46. Connecting plate; 5. Printing roller; 6. Traction roller; 7. Tension roller. Detailed Implementation

[0033] The following combination Figure 1 - Figure 4 This application will be described in further detail below.

[0034] Example: A cam phase difference overprinting compensation mechanism for a multi-color printing press, referring to... Figures 1 to 3 The system includes a printing frame 1, which serves as a mounting and clamping unit for subsequent components. A correction mechanism 2 is mounted on the top of the printing frame 1, providing a mounting surface and supporting its stable operation. A support plate 3 is fixedly connected to the bottom of the printing frame 1, providing bottom support and enhancing overall structural stability. A tension adjustment mechanism 4 is mounted on the outer wall of the support plate 3, providing an installation reference for the tension adjustment mechanism 4 and allowing it to adjust the tension of the printing material.

[0035] Specifically, the printing stand 1 supports the correction mechanism 2 and the support plate 3. The correction mechanism 2 is responsible for correcting the printing position, and the support plate 3 supports the tension adjustment mechanism 4 to adjust the material tension. This overall system achieves phase difference compensation and stable tension control during multi-color printing, preventing overprinting deviations and material transfer problems, and ensuring print quality.

[0036] The correction mechanism 2 includes a sealed box 21. The bottom of the sealed box 21 is fixedly connected to the top of the printing frame 1. The printing frame 1 supports the sealed box 21. The sealed box 21 provides a closed protective space for the internal components. The bottom of the sealed box 21 is fixedly connected to the top of the printing frame 1. The inner wall of the sealed box 21 is fixedly connected to a cylinder 22, providing a mounting point for the cylinder 22 to ensure its stable power output. The inner wall of the sealed box 21 is fixedly connected to a cylinder 22, providing a mounting point for the cylinder 22 to ensure its stable power output.

[0037] Specifically, the sealed box 21 supports and protects the cylinder 22. The cylinder 22 drives the rack 23, which in turn drives the gear 25 and the eccentric wheel 26 to rotate, pushing the fixed block 284 to adjust the position of the printing roller 5. This achieves phase difference compensation and position correction during multi-color printing, prevents overprinting deviation caused by cam phase difference, and ensures printing registration accuracy.

[0038] A rack and pinion is fixedly connected to the drive end of cylinder 22. The extension and retraction of cylinder 22 drives rack and pinion to move linearly, transmitting power. A connecting rod 24 is rotatably connected to the inner wall of sealed box 21. The inner wall of sealed box 21 is rotatably connected to connecting rod 24, providing a rotation support point for connecting rod 24 so that it can rotate flexibly. A gear 25 is fixedly connected to the top of connecting rod 24. The rotation of gear 25 can drive connecting rod 24 to rotate synchronously, realizing power transmission.

[0039] Specifically, cylinder 22 drives rack 23 to move linearly, and rack 23 drives gear 25 and connecting rod 24 to rotate, converting linear motion into rotational motion, thus realizing the conversion and transmission of power. This prevents adjustment lag or failure due to poor power transmission, ensures timely response of correction mechanism 2 and accurate compensation of cam phase difference, and improves overprinting accuracy.

[0040] An eccentric wheel 26 is fixedly connected to the bottom end of the connecting rod 24. The rotation of the connecting rod 24 drives the eccentric wheel 26 to rotate, generating an adjustment force by utilizing the eccentricity. A fixing block 27 is fixedly connected to the adjacent side of the printing frame 1. The fixing block 27 provides an installation support base for the guide assembly 28. The guide assembly 28 is installed at the top of the fixing block 27. The movement of the fixing block 27 affects the guide assembly 28 through transmission. The guide assembly 28 provides guidance for the movement of related components.

[0041] Specifically, the eccentric wheel 26 rotates with the connecting rod 24, generating an eccentric adjustment force that pushes the fixed block 284 to slide along the guide assembly 28, thereby achieving precise adjustment of the printing roller 5 position. This prevents printing position deviations caused by cam phase differences, ensures registration accuracy in multi-color printing, and improves the stability of print quality.

[0042] Reference Figures 1 to 3 The two guide components 28 include two fixed plates 281. The bottom ends of the two fixed plates 281 are fixedly connected to the top ends of two fixed blocks 27. The bottom ends of the fixed plates 281 are fixedly connected to the top ends of the fixed blocks 27. The fixed blocks 27 provide stable support for the fixed plates 281, enabling the fixed plates 281 to stably support other components. The inner walls of the two fixed plates 281 are slidably connected to guide rods 282. The guide rods 282 are slidably connected to the inner walls of the fixed plates 281, providing a sliding channel for the guide rods 282 and restricting their movement direction, ensuring that the guide rods 282 slide smoothly along a straight line.

[0043] Specifically, the fixed plate 281 is stably supported by the fixed block 27, and the guide rod 282 slides along its inner wall to provide a precise trajectory for the movement of the fixed block 284. This achieves stable guidance and position constraint during the adjustment of the printing roller 5, prevents correction errors caused by movement deviation, ensures the accuracy of cam phase difference compensation, and improves the overprinting quality.

[0044] Springs 283 are fitted on the outer walls of both guide rods 282. The guide rods 282 limit the deformation range and direction of the springs 283, while the springs 283 provide elastic restoring force for the guide rods 282. Fixing blocks 284 are fixedly connected to the opposite sides of both guide rods 282. Fixing blocks 284 continue to contact the opposite sides of the guide rods 282, thereby driving the guide rods 282 to move.

[0045] Specifically, spring 283 provides elastic restoring force based on guide rod 282, and fixed block 284 moves with guide rod 282 and cooperates with eccentric wheel 26 to realize elastic adjustment and reset of printing roller 5. This prevents rigid impact and positional deviation during adjustment, ensures the smoothness and accuracy of cam phase difference compensation, and avoids overprinting deviation.

[0046] Reference Figures 2 to 4 The tension adjustment mechanism 4 includes a second sealing box 41, which provides installation space and protection for the internal components. The adjacent sides of the second sealing box 41 are fixedly connected to the outer wall of one of the support plates 3. The adjacent sides of the second sealing box 41 are fixedly connected to the outer wall of the support plate 3. The support plate 3 provides installation support for the second sealing box 41. The second sealing box 41 protects the internal components. The inner wall of the second sealing box 41 is fixedly connected to a second cylinder 42.

[0047] Specifically, the second sealing box 41 is stably supported by the support plate 3, providing a sealed protective space for the second cylinder 42 and ensuring the stable operation of the second cylinder 42. This ensures the reliable installation and protection of the tension adjustment mechanism 4, preventing interference from external impurities or damage to components, guaranteeing the continuous stability of the tension adjustment function, and improving the accuracy and quality of printing material transmission.

[0048] Cylinder 2 42 is fixedly connected to the inner wall of the sealing box 2 41, providing fixed support for cylinder 2 42 and ensuring its stable operation. The drive end of cylinder 2 42 is fixedly connected to rack 2 43. Cylinder 2 42 drives rack 2 43 to make linear motion and transmit power. The inner walls of the two support plates 3 are rotatably connected to connecting rod 2 44, providing a fulcrum for connecting rod 2 44 to rotate flexibly. The outer wall of one of the connecting rods 2 44 is fixedly connected to gear 2 45. The rotation of gear 2 45 drives connecting rod 2 44 to rotate synchronously, realizing power transmission. The adjacent sides of the two connecting rods 2 44 are fixedly connected to connecting plate 46. The rotation of connecting rod 2 44 drives connecting plate 46 to move. Connecting plate 46 acts on the printing material to adjust tension.

[0049] Specifically, the sealing box 41 supports the cylinder 42, which drives the rack 43 to rotate the gear 45 and connecting rod 44, thereby adjusting the tension of the connecting plate 46. This achieves dynamic control of the printing material tension, preventing wrinkles and misalignment caused by unstable tension, and ensuring the registration accuracy and transmission stability of multi-color printing.

[0050] Reference Figures 2 to 4 Two fixed blocks 27 are rotatably connected to printing rollers 5 on their adjacent sides, providing rotational support for the printing rollers 5. The printing rollers 5 are used for printing operations. Two printing frames 1 are fixedly connected to traction rollers 6 on their adjacent sides, supporting the traction rollers 6. The traction rollers 6 pull the printing material for transmission. Two fixed blocks 284 are in contact with the outer walls of two eccentric wheels 26 on their distant sides. The eccentric wheels 26 rotate and push the fixed blocks 284 to move, transmitting adjustment force. Two fixed blocks 284 are in contact with the left and right ends of the printing rollers 5 on their adjacent sides, driving the printing rollers 5 to adjust their position and correct printing deviations.

[0051] Specifically, the printing roller 5 relies on the fixed block 27 for printing, the traction roller 6 pulls the material for transmission, and the fixed block 284 is pushed by the eccentric wheel 26 to adjust the position of the printing roller 5. This achieves coordinated operation of printing material transmission and phase difference correction, preventing overprinting deviation and unstable transmission, and ensuring the accuracy of multi-color printing.

[0052] The outer teeth of the two racks 23 are meshed with the outer teeth of the two gears 25. The teeth of the racks 23 mesh with the teeth of the gears 25. The movement of the racks 23 drives the rotation of the gears 25, realizing power transmission. The outer walls of the two racks 23 are slidably connected to the inner walls of the two sealed boxes 21. The outer walls of the racks 23 are slidably connected to the inner walls of the sealed boxes 21. The sealed boxes 21 provide sliding guidance for the racks 23 to ensure stable movement. One end of each of the two springs 283 is fixedly connected to the opposite side of the two fixed plates 281, and the other end of each spring 283 is fixedly connected to the adjacent side of the two fixed blocks 284. One end of each spring 283 is connected to the opposite side of the fixed plate 281, and the other end is connected to the adjacent side of the fixed block 284, providing a restoring force for the fixed block 284 and buffering the impact.

[0053] Specifically, rack 23 meshes with gear 25 for transmission, sealed box 21 guides and ensures stability, and spring 283 provides reset force for fixed block 284. This synergy achieves efficient power transmission and adjustment buffering, prevents transmission deviation and rigid impact, ensures accurate phase difference compensation, and avoids overlapping deviations.

[0054] Tension rollers 7 are rotatably connected to the adjacent sides of the two connecting plates 46. The tension rollers 7 are rotatably connected to the adjacent sides of the connecting plates 46, which drives the tension rollers 7 to adjust their position. The tension rollers 7 act on the material to adjust the tension. The outer teeth of gear 2 45 are meshed with the outer teeth of rack 2 43. The teeth of gear 2 45 mesh with the teeth of rack 2 43. The movement of rack 2 43 drives gear 2 45 to rotate, completing the power conversion. The outer wall of rack 2 43 is slidably connected to the inner wall of sealing box 2 41. The outer wall of rack 2 43 is slidably connected to the inner wall of sealing box 2 41. Sealing box 2 41 provides sliding guidance for rack 2 43 to ensure smooth movement. The outer wall of one of the connecting rods 2 44 is rotatably connected to the inner wall of sealing box 2 41. Sealing box 2 41 provides rotational support for connecting rod 2 44 to ensure its stable rotation.

[0055] Specifically, the connecting plate 46 drives the tension roller 7 for adjustment, the gear 45 meshes with the rack 43 to convert power, and the sealing box 41 guides and supports the connecting rod 44. This collaborative process achieves precise tension adjustment of the printing material, preventing wrinkles and misalignment caused by uneven tension, and ensuring accurate registration in multi-color printing.

[0056] The implementation principle of this application embodiment is as follows: When the correction mechanism 2 is working, the cylinder 22 in the sealed box 21 drives the rack 23 to move. The rack 23 drives the meshing gear 25 to rotate. The gear 25 drives the eccentric wheel 26 to rotate through the connecting rod 24. The eccentric wheel 26 presses the fixing block 284 on the outer wall of the guide rod 282, causing the guide rod 282 to slide in the fixing plate 281 and compress the spring 283. The guide rod 282 contacts the printing roller 5 to correct the printing roller 5. When the spring 283 resets, it drives the guide rod 282 and the fixing block 284 to return to their original positions. The correction and adjustment of the printing material is realized through the above transmission. The fixing block 27 provides installation support for the guide assembly 28, and the sealed box 21 protects the internal components. The whole system works together to complete the position correction of the printing material.

[0057] When the tension adjustment mechanism 4 is working, the cylinder 42 inside the sealing box 41 is activated, driving the rack 43, which is fixedly connected to its drive end, to move linearly. The rack 43 drives the gear 45, which meshes with it, to rotate. The gear 45 is fixed to the outer wall of the connecting rod 44, thereby causing the connecting rod 44 to rotate on the inner wall of the support plate 3. Since the connecting plates 46 are fixedly connected to the adjacent sides of the two connecting rods 44, the rotation of the connecting rods 44 drives the connecting plates 46 to move. The connecting plates 46 drive the tension roller 7 to move, thereby realizing the adjustment and control of the material tension. The sealing box 41 provides sealing protection for the internal components, preventing interference from external factors and ensuring that the entire tension adjustment process is stable, accurate, and efficient.

[0058] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cam phase difference overprinting compensation mechanism for a multicolor printing press, comprising a printing frame (1), characterized in that: The top of the printing frame (1) is equipped with a correction mechanism (2), the bottom of the printing frame (1) is fixedly connected with a support plate (3), and the outer wall of the support plate (3) is equipped with a tension adjustment mechanism (4). The correction mechanism (2) includes a sealing box (21), the bottom end of which is fixedly connected to the top end of the printing frame (1), a cylinder (22) is fixedly connected to the inner wall of the sealing box (21), a rack (23) is fixedly connected to the drive end of the cylinder (22), a connecting rod (24) is rotatably connected to the inner wall of the sealing box (21), a gear (25) is fixedly connected to the top end of the connecting rod (24), an eccentric wheel (26) is fixedly connected to the bottom end of the connecting rod (24), a fixing block (27) is fixedly connected to the adjacent side of the printing frame (1), and a guide component (28) is installed at the bottom end of the fixing block (27).

2. The cam phase difference overprinting compensation mechanism for a multi-color printing machine according to claim 1, characterized in that: The two guide components (28) include two fixing plates (281), the bottom ends of the two fixing plates (281) are fixedly connected to the top ends of the two fixing blocks (27), the inner walls of the two fixing plates (281) are slidably connected with guide rods (282), the outer walls of the two guide rods (282) are fitted with springs (283), and the opposite sides of the two guide rods (282) are fixedly connected with fixing blocks (284).

3. The cam phase difference overprinting compensation mechanism for a multi-color printing machine according to claim 1, characterized in that: The tension adjustment mechanism (4) includes a second sealing box (41). The two adjacent sides of the second sealing box (41) are fixedly connected to the outer wall of one of the support plates (3). The inner wall of the second sealing box (41) is fixedly connected to a second cylinder (42). The driving end of the second cylinder (42) is fixedly connected to a second rack (43). The inner walls of the two support plates (3) are rotatably connected to a second connecting rod (44). The outer wall of one of the second connecting rods (44) is fixedly connected to a second gear (45). The two adjacent sides of the two second connecting rods (44) are fixedly connected to a connecting plate (46).

4. The cam phase difference overprinting compensation mechanism for a multi-color printing machine according to claim 2, characterized in that: Printing rollers (5) are rotatably connected to the adjacent sides of the two fixed blocks (27), traction rollers (6) are fixedly connected to the adjacent sides of the two printing frames (1), the distant sides of the two fixed blocks (284) are in contact with the outer walls of the two eccentric wheels (26), and the adjacent sides of the two fixed blocks (284) are in contact with the left and right ends of the printing rollers (5).

5. The cam phase difference overprinting compensation mechanism for a multi-color printing machine according to claim 1, characterized in that: The outer teeth of the two racks (23) are meshed with the outer teeth of the two gears (25), and the outer walls of the two racks (23) are slidably connected to the inner walls of the two sealing boxes (21).

6. The cam phase difference overprinting compensation mechanism for a multi-color printing machine according to claim 2, characterized in that: One end of each of the two springs (283) is fixedly connected to the opposite side of the two fixing plates (281), and the other end of each of the two springs (283) is fixedly connected to the adjacent side of the two fixing blocks (284).

7. The cam phase difference overprinting compensation mechanism for a multi-color printing press according to claim 3, characterized in that: Tension rollers (7) are rotatably connected to the adjacent sides of the two connecting plates (46), and the outer teeth of the gear two (45) are meshed with the outer teeth of the rack two (43).

8. The cam phase difference overprinting compensation mechanism for a multi-color printing machine according to claim 3, characterized in that: The outer wall of the second rack (43) is slidably connected to the inner wall of the second sealing box (41), and the outer wall of one of the second connecting rods (44) is rotatably connected to the inner wall of the second sealing box (41).

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