Automatic pre-overprinting system of rotary press

Abstract

The utility model provides an automatic pre-overprinting system of a rotary press, and relates to the technical field of rotary presses, the automatic pre-overprinting system comprises a base, a fixing frame, a telescopic rod and an assembling frame, one side of the base is provided with a supporting plate, the outer side of the supporting plate is provided with a sliding mechanism matched with the assembling frame, and a plurality of rotating rollers are rotatably installed in the assembling frame; the sliding mechanism comprises a gear, a hydraulic cylinder, a first rack and a second rack. When the hydraulic cylinder drives the first rack to move upwards, the first rack can drive the gear to rotate clockwise, the gear is further meshed with the outer wall of the second rack, the gear can drive the second rack to move downwards, the first rack and the second rack are connected with the two assembling frames respectively, and therefore the assembling efficiency is improved. The rotating rollers in the assembling frames are used for pulling the printing paper to move, and the distance between the printing paper is adjusted to automatically drive the two printing color codes to be aligned with each other.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary printing presses, in particular to an automatic pre-registration system for a rotary printing press. Background Art

[0002] A rotary printing press is a type of web offset printing press. The printing unit includes multiple color groups. When installing and replacing the plate rollers, in order to ensure accurate overprinting, reduce the automatic registration range, and improve work efficiency, the plate rollers of each color group need to be in a fixed position. In this position, the patterns printed on the substrate by the plate rollers of each color group are almost completely overlapped. This process is called pre-registration.

[0003] When a rotary printing press is performing pre-registration, it is generally performed manually. After the staff installs the printing roller, the printing press is operated to run the material at a low speed for printing registration. At the same time, the staff is required to observe the printed color marks of the front and rear color groups one by one, and estimate the error between the two color marks. When the error is greater than 20 mm, the plate roller transmission clutch handle is manually and repeatedly disconnected quickly, so that the front and rear color marks are basically overlapped. When this method is implemented, it has greater requirements on the staff, and the adjustment is more troublesome, which reduces the printing work efficiency. Therefore, the utility model proposes an automatic pre-registration system for a rotary printing press to solve the above problems. Utility Model Content

[0004] In view of the above problems, the utility model proposes an automatic pre-registration system for a rotary printing press to solve the problem that the color mark is adjusted by manually and repeatedly quickly disconnecting the plate roller transmission clutch handle in the prior art, which places great demands on the staff and is troublesome to adjust.

[0005] To achieve the purpose of the utility model, the utility model is implemented through the following technical scheme: an automatic pre-overprinting system for a rotary printing press, including a base, a fixed frame, a telescopic rod and an assembly frame, the fixed frames are symmetrically arranged on both sides of the base, a group of telescopic rods are symmetrically arranged between the fixed frame and the base, one end of each group of telescopic rods is connected to the assembly frame, a support plate is provided on one side of the base, a sliding mechanism matching the assembly frame is provided on the outer side of the support plate, and a plurality of rollers are rotatably installed inside the assembly frame.

[0006] The sliding mechanism includes a gear, a hydraulic cylinder, a No. 1 rack and a No. 2 rack. A gear is rotatably installed on the outer side of the support plate. The No. 1 rack and the No. 2 rack are slidably installed on both sides of the support plate. One side of the No. 1 rack and the No. 2 rack are respectively meshed with the gears. A hydraulic cylinder is installed on the support plate. The output end of the hydraulic cylinder is fixedly connected to the top end of the No. 1 rack. One end of the No. 1 rack and the No. 2 rack is respectively fixedly connected to one side of two assembly frames.

[0007] A further improvement is that a connecting frame is provided on one side of the assembly frame at the top, a guide rod is fixedly connected to the top of the connecting frame, and limiting mechanisms matching the printing paper are symmetrically provided on both sides of the guide rod.

[0008] A further improvement is that the limiting mechanism includes a slider, a fixed plate and a fastening bolt, the two ends of the guide rod are symmetrically slidably connected with the slider, one side of the slider is fixedly connected with the fixed plate, and the top of the slider is threadedly connected with the fastening bolt.

[0009] A further improvement is that a support frame is provided on one side of the base away from the connecting frame, slide grooves are symmetrically provided on both sides of the top of the support frame, and a tensioning mechanism matching the printing paper is provided between the support frame and the slide grooves.

[0010] Further improvements are: the tensioning mechanism includes a sliding beam, a tensioning roller and a threaded rod, the sliding beam is slidably installed inside the slide groove, the tensioning roller is rotatably installed on the bottom end of the sliding beam, the top of the support frame is threadedly connected with a threaded rod, and the bottom end of the threaded rod is rotatably connected to the top of the sliding beam.

[0011] A further improvement is that the positions of the rollers inside the two assembly frames are staggered, and the printing paper passes through the upper and lower rollers in sequence to form a V-shaped structure, and the center position of the guide rod and the center position of the roller are on the same straight line.

[0012] The beneficial effects of the utility model are as follows: when the hydraulic cylinder drives the No. 1 rack to move upward, the No. 1 rack will drive the gear to rotate clockwise, and the gear is also meshed with the outer wall of the No. 2 rack, so the gear will drive the No. 2 rack to move downward. Because the No. 1 rack and the No. 2 rack are respectively connected to the two assembly frames, they are used to drive the two assembly frames to separate from each other, and the rotating roller inside the assembly frame is used to pull the printing paper to move, and the distance between the printing papers is adjusted to automatically drive the two printing color marks to align with each other, so as to solve the problem that the color mark is adjusted by manually and repeatedly quickly disconnecting the plate roller transmission clutch handle in the prior art, which has great requirements on the staff and is more troublesome to adjust. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the front view of the utility model;

[0014] Figure 2 It is a side view of the utility model;

[0015] Figure 3 The utility model is a sliding mechanism structure.

[0016] Among them: 1. Base; 2. Fixed frame; 3. Telescopic rod; 4. Assembly frame; 5. Roller; 6. Support plate; 7. Gear; 8. Hydraulic cylinder; 9. Rack No. 1; 10. Rack No. 2; 11. Connecting frame; 12. Guide rod; 13. Slider; 14. Fixed plate; 15. Fastening bolt; 16. Support frame; 17. Slide groove; 18. Sliding beam; 19. Tensioning roller; 20. Threaded rod. DETAILED DESCRIPTION

[0017] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with an embodiment. The embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0018] according to Figure 1 , 2 As shown in Figure 3, this embodiment proposes an automatic pre-overprinting system for a rotary printing press, including a base 1, a fixed frame 2, a telescopic rod 3 and an assembly frame 4, the fixed frames 2 are symmetrically arranged on both sides of the base 1, a group of telescopic rods 3 are symmetrically arranged between the fixed frame 2 and the base 1, and one end of each group of telescopic rods 3 is connected to the assembly frame 4, a support plate 6 is arranged on one side of the base 1, and a sliding mechanism matching the assembly frame 4 is arranged on the outer side of the support plate 6, a plurality of rollers 5 are rotatably installed inside the assembly frame 4, and the printing paper is wound around the rollers 5 inside the assembly frame 4 in a V-shaped structure. When it is necessary to adjust the error between two printing color marks, the sliding mechanism will drive the two assembly frames 4 away from each other, so that the rollers 5 pull the printing paper to move, so as to adjust the position of the printing paper until the two printing color marks are aligned with each other.

[0019] The sliding mechanism includes a gear 7, a hydraulic cylinder 8, a first rack 9 and a second rack 10. The gear 7 is rotatably installed on the outer side of the support plate 6. The first rack 9 and the second rack 10 are slidably installed on both sides of the support plate 6. One side of the first rack 9 and the second rack 10 are respectively meshed with the gear 7. A hydraulic cylinder 8 is installed on the support plate 6. The output end of the hydraulic cylinder 8 is fixedly connected to the top of the first rack 9. One end of the first rack 9 and the second rack 10 are respectively fixedly connected to one side of the two assembly frames 4. The first rack 9 is connected to the output end of the hydraulic cylinder 8, and the first rack 9 is meshed with the outer wall of the gear 7. When the hydraulic cylinder 8 drives the No. 1 rack 9 to move upward, the No. 1 rack 9 will drive the gear 7 to rotate clockwise, and the gear 7 will also mesh with the outer wall of the No. 2 rack 10, and the gear 7 will drive the No. 2 rack 10 to move downward. Because the No. 1 rack 9 and the No. 2 rack 10 are respectively connected to the two assembly frames 4, they are used to drive the two assembly frames 4 to separate from each other, and the roller 5 inside the assembly frame 4 is used to pull the printing paper to move, and the distance between the printing paper is adjusted to automatically drive the two printing color marks to align with each other. When the printing work is completed, the hydraulic cylinder 8 drives the No. 1 rack 9 to move downward, and the gear 7 and the No. 2 rack 10 cooperate to drive the two assembly frames 4 to close together again.

[0020] A connecting frame 11 is provided on one side of the assembly frame 4 at the top, and a guide rod 12 is fixedly connected to the top of the connecting frame 11. Limiting mechanisms matching the printing paper are symmetrically provided on both sides of the guide rod 12, and the limiting mechanisms include a slider 13, a fixing plate 14 and a fastening bolt 15. The two ends of the guide rod 12 are symmetrically slidably connected with the sliders 13, and one side of the slider 13 is fixedly connected with the fixing plate 14. The top of the slider 13 is threadedly connected with the fastening bolt 15. The fastening bolt 15 on the top of the slider 13 is loosened so that the fastening bolt 15 no longer locks the slider 13 and the guide rod 12. At this time, the slider 13 slides on the outside of the guide rod 12 to adjust the position of the fixing plate 14 so that it fits together with the two sides of the printing paper and pushes the printing paper to the center of the guide rod 12. Then, the fastening bolt 15 is tightened to lock the position of the slider 13, and the fixing plate 14 limits the printing paper at the center of the guide rod 12.

[0021] A support frame 16 is provided on the side of the base 1 away from the connecting frame 11, and slide grooves 17 are symmetrically provided on both sides of the top of the support frame 16. A tensioning mechanism matching the printing paper is provided between the support frame 16 and the slide groove 17, and the tensioning mechanism includes a sliding beam 18, a tensioning roller 19 and a threaded rod 20. The sliding beam 18 is slidably installed inside the slide groove 17, and the tensioning roller 19 is rotatably installed at the bottom end of the sliding beam 18. The top of the support frame 16 is threadedly connected with a threaded rod 20, and the bottom end of the threaded rod 20 is rotatably connected to the top of the sliding beam 18. The sliding groove 17 can limit the moving trajectory of the sliding beam 18 so that it can only move in a straight line. The threaded rod 20 is threadedly matched with the support frame 16, and the bottom end of the threaded rod 20 is rotatably connected to the top of the sliding beam 18, so twisting the threaded rod 20 can drive the sliding beam 18 to move back and forth in a straight line, and the direction of movement of the sliding beam 18 is controlled by the rotation direction of the threaded rod 20. The movement of the sliding beam 18 can drive the tensioning roller 19 to move downward to squeeze the printing paper on the roller 5, so as to tighten the printing paper on the roller 5 and make it smoother during transportation.

[0022] The positions of the rollers 5 inside the two assembly frames 4 are offset from each other, and the printing paper passes through the upper and lower rollers 5 in sequence to form a V-shaped structure, and the center position of the guide rod 12 and the center position of the roller 5 are on the same straight line.

[0023] In the automatic pre-registration system of the rotary printing press, when the hydraulic cylinder 8 drives the No. 1 rack 9 to move upward, the No. 1 rack 9 will drive the gear 7 to rotate clockwise, and the gear 7 is also meshed with the outer wall of the No. 2 rack 10. The gear 7 will drive the No. 2 rack 10 to move downward. Because the No. 1 rack 9 and the No. 2 rack 10 are respectively connected to the two assembly frames 4, they are used to drive the two assembly frames 4 to separate from each other, and the roller 5 inside the assembly frame 4 is used to pull the printing paper to move, and the distance between the printing papers is adjusted to automatically drive the two printing color marks to align with each other.

[0024] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An automatic pre-registration system for a rotary printing press, comprising a base (1), a fixed frame (2), a telescopic rod (3) and an assembly frame (4), characterized in that: A fixing frame (2) is symmetrically provided on both sides of the base (1); a group of telescopic rods (3) is symmetrically provided between the fixing frame (2) and the base (1); one end of each group of telescopic rods (3) is connected to an assembly frame (4); a support plate (6) is provided on one side of the base (1); a sliding mechanism matching the assembly frame (4) is provided on the outer side of the support plate (6); and a plurality of rollers (5) are rotatably installed inside the assembly frame (4); The sliding mechanism comprises a gear (7), a hydraulic cylinder (8), a first rack (9) and a second rack (10); the gear (7) is rotatably mounted on the outer side of the support plate (6); the first rack (9) and the second rack (10) are slidably mounted on both sides of the support plate (6); one side of the first rack (9) and the second rack (10) are respectively meshed with the gear (7); a hydraulic cylinder (8) is mounted on the support plate (6); the output end of the hydraulic cylinder (8) is fixedly connected to the top end of the first rack (9); one end of the first rack (9) and the second rack (10) are respectively fixedly connected to one side of two assembly frames (4).

2. The automatic pre-registration system for a rotary printing press according to claim 1, characterized in that: A connecting frame (11) is provided on one side of the assembly frame (4) at the top, a guide rod (12) is fixedly connected to the top of the connecting frame (11), and limiting mechanisms matching the printing paper are symmetrically provided on both sides of the guide rod (12).

3. The automatic pre-registration system for a rotary printing press according to claim 2, characterized in that: The limiting mechanism comprises a slider (13), a fixing plate (14) and a fastening bolt (15); the two ends of the guide rod (12) are symmetrically slidably connected to the sliders (13); one side of the slider (13) is fixedly connected to the fixing plate (14); and the top of the slider (13) is threadedly connected to the fastening bolt (15).

4. The automatic pre-registration system for a rotary printing press according to claim 2, characterized in that: A support frame (16) is provided on one side of the base (1) away from the connecting frame (11), sliding grooves (17) are symmetrically provided on both sides of the top of the support frame (16), and a tensioning mechanism matching the printing paper is provided between the support frame (16) and the sliding groove (17).

5. The automatic pre-registration system for a rotary printing press according to claim 4, characterized in that: The tensioning mechanism comprises a sliding beam (18), a tensioning roller (19) and a threaded rod (20); the sliding beam (18) is slidably installed inside the sliding groove (17); the tensioning roller (19) is rotatably installed at the bottom end of the sliding beam (18); the top of the support frame (16) is threadedly connected to the threaded rod (20); the bottom end of the threaded rod (20) is rotatably connected to the top of the sliding beam (18).

6. The automatic pre-registration system for a rotary printing press according to claim 2, characterized in that: The positions of the rollers (5) inside the two assembly frames (4) are offset from each other, and the printing paper passes through the upper and lower rollers (5) in sequence to form a V-shaped structure, and the center position of the guide rod (12) and the center position of the roller (5) are on the same straight line.

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