Rotary flexographic printing press

Abstract

The present invention relates to the technical field of rotary printing presses, and specifically to a rotary flexographic printing press, comprising a fixed frame, a pressure roller and an adjusting roller; the fixed frame is provided with an adjusting rod and a cylinder, the cylinder is provided with two groups of cavities, the adjusting roller is movably mounted on the fixed frame, the fixed frame is provided with an electromagnetic frame for driving the adjusting frame to rotate, the adjusting frame is provided with an adjusting shaft, and a semi-cam is provided on a mounting column; a detection member is provided with two groups, each group of detection members is provided with two groups of guide wheels, a connecting block for installing the detection member is provided on the fixed frame, the detection member is arranged on the connecting block through a rotating shaft, a trigger switch for starting the electromagnetic frame and two groups of piston tubes symmetrically distributed on both sides of the trigger switch are provided on the detection member, and the two groups of piston tubes are respectively connected with the two cavities on the cylinder through an air inlet pipe. The present invention adjusts the angle according to the displacement of the detection member, promptly returns the inclined substrate to the right position, automatically adjusts the tension of the substrate, prevents the occurrence of wrinkles, and improves the printing quality.

Description

Technical Field

[0001] The invention relates to the technical field of rotary printing presses, in particular to a rotary flexographic printing press. Background Art

[0002] A rotary printing press is a printing press in which the image to be printed is bent around a cylinder and can be printed on a variety of substrates, including substrates, cardboard and plastic. The substrate can be fed in sheets or unwound through the printing press on a continuous roll for printing and further modified when necessary. In order to ensure good print quality during the printing process, the printed substrate needs to be positioned and pressed so that the substrate and the printing roller can be fully in contact and the feed amount is the same, reducing the phenomenon of no printing overlap or misprinting or missing printing during printing.

[0003] A Chinese patent with publication number CN113478961B discloses a high-reliability rotary printing press clamping device, which uses multiple groups of manually adjustable components to adjust the pressure rollers to clamp the substrate. The device can perform stable and accurate clamping on the printed substrate to ensure printing quality, improve printing efficiency, and reduce production and printing costs. It is highly practical, but it is unable to accurately adjust the pressure of the two groups of pressure rollers on the substrate. The different pressures of the pressure rollers may easily lead to differences in the feed amount and tension of the substrate. During a long printing process, the substrate may wrinkle, the substrate may tilt with the guide roller, and the substrate may be misaligned with the printing roller, resulting in missing or wrong printing. The device cannot be adjusted automatically, which affects the printing quality of the printing press. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a rotary flexographic printing machine, which can effectively solve the problems in the prior art such as differences in substrate feed amount leading to substrate wrinkling, misprinting and missing printing, and inability to automatically adjust the substrate, which affects the printing quality.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] The present invention provides a rotary flexographic printing press, comprising a fixed frame, pressure rollers arranged on both sides of the fixed frame for respectively pressing a substrate, and an adjusting roller for adjusting the tension of the substrate;

[0007] Two groups of adjusting rods and a cylinder are slidably mounted on one end of the fixing frame close to the adjusting roller, and two groups of symmetrically distributed cavities are arranged in the cylinder, and pistons connected to the two groups of adjusting rods are arranged in the cavities;

[0008] The adjusting roller is movably mounted on the fixed frame through the adjusting frame, the fixed frame is provided with an electromagnetic frame for driving the adjusting frame to rotate, the adjusting frame is provided with an adjusting shaft, the adjusting shaft is provided with a mounting column rotatably connected to the fixed frame, and the mounting column is attached to the adjusting rod, and the mounting column is provided with a semi-cam for limiting its rotation angle;

[0009] The detection parts are provided with two groups and are movably arranged on the fixed frame, wherein one group of detection parts is located near the pressure roller, and the other group of detection parts is located near the adjustment roller, and are used to detect the inclination of the substrate. Each group of detection parts is provided with two groups of guide wheels for sticking to the two sides of the substrate. The fixed frame is provided with a connecting block for mounting the detection parts. The detection parts are rotatably arranged on the connecting block through a rotating shaft, and the detection parts are provided with a slide groove for sliding the rotating shaft. The detection parts are provided with a trigger switch for starting the electromagnetic frame and two groups of piston tubes symmetrically distributed on both sides of the trigger switch. The two groups of piston tubes are respectively connected with the two cavities on the cylinder through the air inlet pipe.

[0010] Furthermore, the guide wheel is composed of two groups of pulleys fitted together, which can better fit the substrate and facilitate guiding substrates of different thicknesses.

[0011] Furthermore, each group of detection members is provided with two groups of guide wheels, the guide wheels are slidably mounted on the detection members via guide rods, and the detection members are provided with threaded rods for adjusting the height of the guide wheels.

[0012] Furthermore, the guide wheel is rotatably connected to the guide rod, and the guide rod is provided with a nut for locking the guide wheel.

[0013] Furthermore, the fixing frame is composed of two rectangular frames, which facilitates the adjustment of the height of the guide wheel on the detection member.

[0014] Furthermore, the pressing roller is arranged on the fixing frame through a supporting frame, and two ends of the pressing roller are elastically connected to two ends of the supporting frame.

[0015] Furthermore, the electromagnetic frame is provided with two groups of electromagnets, and the two groups of electromagnets are symmetrically distributed on the electromagnetic frame and located at two ends close to the adjustment frame, and a magnetic block is correspondingly provided on one side of the adjustment frame close to the electromagnetic frame.

[0016] Furthermore, the fixing frame is provided with an elastic member for resetting the mounting column, and the mounting column is correspondingly provided with an annular groove for installing the elastic member.

[0017] Beneficial Effects

[0018] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0019] The present invention detects the tension of the substrate through two groups of detection parts on the fixed frame, drives the detection part and the connecting block to have relative displacement by the inclination of the substrate, starts the electromagnetic frame to provide the adjusting frame with rotational power, and at the same time the detection part and the connecting block are relatively displaced. The generated displacement will push the piston tube on the detection part, push the adjusting rod to be displaced, cooperate with the semi-cam, so that the adjusting rod will gradually move with the displacement degree of the detection part, adjust the angle according to the displacement of the detection part, timely return the inclined substrate to the right position, automatically adjust the tension of the substrate, prevent the occurrence of wrinkles, and improve the printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 for Figure 1 A top view of

[0023] Figure 3 for Figure 1 Right view of;

[0024] Figure 4 It is a schematic diagram of the connection structure between the detection member and the fixing frame of the present invention;

[0025] Figure 5 It is a schematic diagram of a partial cross-sectional structure of the detection member of the present invention;

[0026] Figure 6 It is a partial cross-sectional view of the connection between the adjustment frame and the fixing frame of the present invention;

[0027] Figure 7 This is a schematic diagram of the explosion structure of the adjustment shaft of the present invention;

[0028] Figure 8 Schematic diagram of the connection between the adjustment shaft and the adjustment rod in different states of the present invention;

[0029] Fig. 9 It is a schematic diagram of the cross-sectional structure of the guide wheel of the present invention.

[0030] Explanation of the numbers in the figure: 100, fixed frame; 101, adjusting rod; 102, cylinder; 103, air inlet pipe; 200, pressure roller; 300, adjusting roller; 301, adjusting frame; 400, detection member; 401, slide groove; 402, piston tube; 403, trigger switch; 410, connecting block; 411, rotating shaft; 420, guide wheel; 500, adjusting shaft; 501, semi-cam; 502, mounting column; 503, elastic member; 600, electromagnetic frame. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention will be further described below in conjunction with the embodiments.

[0033] Example:

[0034] Reference Figure 1-9 The rotary flexographic printing machine comprises a fixed frame 100, pressure rollers 200 arranged on both sides of the fixed frame 100 for pressing a substrate, and an adjusting roller 300 for adjusting the tension of the substrate; the fixed frame 100 is fixed by a supporting structure, wherein the fixed frame 100 is composed of two rectangular frames, the pressure roller 200 and the adjusting roller 300 are respectively arranged at one end of the two rectangular frames away from each other, the pressure roller 200 squeezes the substrate on the printing roller, the pressure roller 200 is fixedly connected to the fixed frame 100, the pressure roller 200 cannot rotate on the fixed frame 100, and the adjusting roller 300 is movably installed on the fixed frame 100, in addition, the pressure roller 200 is arranged on the fixed frame 100 through the supporting frame, and the two ends of the pressure roller 200 are elastically connected to the two ends of the supporting frame, so as to give the pressure roller 200 a buffering pressure to press the substrate on the printing roller.

[0035] In the above technical solution, the pressing roller 200 on the fixed frame 100 cooperates with the printing roller to press the substrate and print, the adjusting roller 300 guides the substrate, and the adjusting roller 300 rotates on the fixed frame 100 to adjust the tension on both sides of the substrate, so that the substrate can be better input between the printing roller and the pressing roller 200, reducing the occurrence of wrinkles caused by different tensions on both sides of the substrate, and better printing processing.

[0036] The detection member 400 is provided with two groups and is movably arranged on the fixed frame 100, wherein one group of the detection members 400 is located near the side of the pressure roller 200, and the other group of the detection members 400 is located near the side of the adjustment roller 300, and is used to detect the inclination of the substrate. The two groups of detection members 400 near the pressure roller 200 and the adjustment roller 300 are used to detect whether the substrate is inclined. The fixed frame 100 of the detection member 400 is provided with a connecting block 410 for installing the detection member 400, and the detection member 400 is rotatably arranged on the connecting block through a rotating shaft 411 On 410, the detection member 400 can rotate on the connecting block 410 through the rotating shaft 411. When the substrate is tilted, the detection member 400 rotates. Since the detection member 400 is provided with a slide groove 401 for the sliding of the rotating shaft 411, the detection member 400 will move with the substrate during rotation, so that the rotating shaft 411 on the connecting block 410 slides in the slide groove 401. At this time, the detection member 400 and the connecting block 410 slide relative to each other. Two groups of guide wheels 420 are provided on each group of detection members 400, which are used to stick to the two sides of the substrate.

[0037] Specifically, the guide wheel 420 is composed of two sets of pulleys that are bonded together to better fit the substrate and facilitate guiding substrates of different thicknesses.

[0038] Furthermore, each set of detection members 400 is provided with two sets of guide wheels 420, which are slidably mounted on the detection members 400 via guide rods, and the detection members 400 are provided with threaded rods for adjusting the height of the guide wheels 420, so as to facilitate contact with both sides of substrates of different heights.

[0039] In addition, the guide wheel 420 is rotatably connected to the guide rod, and a nut for locking the guide wheel 420 is provided on the guide rod, so that the guide wheel 420 can be easily adjusted to fit substrates with different inclination angles.

[0040] In the above technical solution, the two sides of the substrate are stuck by the guide wheels 420 on the two groups of detection parts 400. When the substrate moves, it will stick to the guide wheels 420. When the substrate is tilted, it will drive the guide wheels 420 to move, thereby driving the detection part 400 and the connecting block 410 to cause relative displacement, thereby detecting whether the substrate between the pressure roller 200 and the adjustment roller 300 is tilted.

[0041] The adjusting roller 300 is movably mounted on the fixing frame 100 via an adjusting frame 301. The adjusting roller 300 can rotate on the fixing frame 100 to adjust the tension at both ends of the substrate. An electromagnetic frame 600 for driving the adjusting frame 301 to rotate is provided on the fixing frame 100. The electromagnetic frame 600 is located on a side of the adjusting roller 300 close to the pressure roller 200. The electromagnetic frame 600 provides power for the adjusting roller 300 to rotate.

[0042] Specifically, the electromagnetic frame 600 is provided with two groups of electromagnets, and the two groups of electromagnets are symmetrically distributed on the electromagnetic frame 600 and located at the two ends close to the adjustment frame 301. A magnetic block is correspondingly provided on one side of the adjustment frame 301 close to the electromagnetic frame 600. The electromagnetic frame 600 is activated by rotating and tilting the detection member 400 clockwise or counterclockwise to cooperate with the magnets on both sides of the adjustment frame 301 to push the two ends of the adjustment frame 301 accordingly. Figure 2 When the detection member 400 rotates clockwise and tilts, the electromagnetic frame 600 starts and pushes the adjustment frame 301 to rotate counterclockwise, thereby driving the adjustment roller 300 to rotate counterclockwise to adjust the tension of the substrate. When the detection member 400 rotates counterclockwise and tilts, the electromagnetic frame 600 starts and pushes the adjustment frame 301 to rotate clockwise, thereby driving the adjustment roller 300 to rotate clockwise to adjust the tension of the substrate.

[0043] An adjusting shaft 500 is provided on the adjusting frame 301, and the adjusting frame 301 rotates on the fixing frame 100 through the adjusting shaft 500 to adjust the rotation angle of the adjusting roller 300. The adjusting shaft 500 is provided with a mounting column 502 rotatably connected to the fixing frame 100, and the mounting column 502 is in contact with the adjusting rod 101, and a semi-cam 501 is provided on the mounting column 502 to limit its rotation angle.

[0044] Furthermore, the fixing frame 100 is provided with an elastic member 503 for resetting the mounting column 502, and the mounting column 502 is correspondingly provided with an annular groove for installing the elastic member 503, which is used for automatically returning the mounting column 502 and the adjusting shaft 500 when the electromagnetic frame 600 is not working.

[0045] A trigger switch 403 for starting the electromagnetic frame 600 is provided on the detection member 400. The detection member 400 and the connecting block 410 slide relative to each other, and the electromagnetic frame 600 is started by the trigger switch 403, thereby driving the adjusting roller 300 to adjust. Two groups of adjusting rods 101 and a fixed cylinder 102 are slidably installed at one end of the fixed frame 100 close to the adjusting roller 300. Two groups of symmetrically distributed cavities are provided in the cylinder 102, and pistons respectively connected to the two groups of adjusting rods 101 are provided in the cavity. The pistons are pushed by inputting gas into the cavity, and then the adjusting rods 101 are pushed to move. The piston tubes 402 are symmetrically distributed on both sides of the trigger switch 403 to control the piston tubes 402. The two groups of piston tubes 402 are connected to the two cavities on the cylinder 102 through the air inlet pipe 103. When the electromagnetic frame 600 is started, the detection member 400 and the connecting block 410 are relatively displaced, so that the connecting block 410 squeezes the piston tube 402 at the displacement end to adjust the adjusting roller 300.

[0046] In the above technical scheme, the adjustment of the adjusting roller 300 occurs in time when the detection member 400 is tilted. After the tilt of the detection member 400 triggers the switch 403 to start the electromagnetic frame 600, due to the relative displacement between the detection member 400 and the connecting block 410, the displacement generated will push the piston tube 402 on the detection member 400, and cooperate with the air inlet pipe 103 to transport the gas to the corresponding cavity on the cylinder 102, thereby pushing the adjustment rod 101 to move. At the same time, since a semi-cam 501 is provided on the mounting column 502, the adjustment rod 101 will gradually move with the degree of displacement of the detection member 400 when it is away from the mounting column 502, and cooperate with the semi-cam 501, so that the adjustment frame 301 and the adjustment roller 300 will adjust the angle according to the displacement of the detection member 400, and promptly return the tilted substrate to the right position, adjust the tension, and prevent wrinkles.

[0047] Working principle: The pressure roller 200 and the adjusting roller 300 at the ends of the two rectangular frames of the fixed frame 100 that are far away from each other are closely attached to the printing roller, so that the pressure roller 200 squeezes the substrate on the printing roller, and the substrate bypasses the adjusting roller 300 and enters the pressure roller 200 and the printing roller. Since the two ends of the pressure roller 200 are elastically connected to the two ends of the support frame, a buffering pressure is given to the pressure roller 200 to better press the substrate on the printing roller. Then, the guide wheel 420 on the detection member 400 is adjusted so that multiple groups of guide wheels 420 are half-fitted with both sides of the substrate. The special structure of the guide wheel 420 is convenient for guiding substrates of different thicknesses. At the same time, with the threaded rod and the nut, it is convenient to fit substrates of different heights and different inclination angles, and then printing is performed. When the substrate tilts, the guide wheel 420 on the detection member 400 will move with the substrate, thereby driving the detection member 400 and the connecting block 410 to have relative displacement. The tilt of the detection member 400 triggers the switch 403 to start the electromagnetic frame 600, and the electromagnetic The electromagnetic frame 600 cooperates with the magnetic block corresponding to the adjustment frame 301. When the detection member 400 rotates clockwise and tilts, the electromagnetic frame 600 starts and generates a force to push the adjustment frame 301 to rotate counterclockwise. When the detection member 400 rotates counterclockwise and tilts, the electromagnetic frame 600 starts and generates a force to push the adjustment frame 301 to rotate clockwise. At the same time, the detection member 400 and the connecting block 410 are relatively displaced. The displacement generated will push the piston tube 402 on the detection member 400 to cooperate with the intake pipe 103 delivers gas to the corresponding cavity on the cylinder 102, thereby pushing the adjustment rod 101 to move. The semi-cam 501 is provided on the mounting column 502. When the adjustment rod 101 moves away from the mounting column 502, it will gradually move with the displacement degree of the detection member 400. In cooperation with the electromagnetic frame 600 and the adjustment frame 301, the adjustment roller 300 will adjust the angle according to the displacement of the detection member 400, and the inclined substrate will be corrected in time, and the tension will be adjusted to prevent wrinkles.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotary flexographic printing press, characterized in that: It comprises a fixing frame (100), pressing rollers (200) arranged on both sides of the fixing frame (100) and used for pressing the substrate, and an adjusting roller (300) for adjusting the tension of the substrate; Two groups of adjusting rods (101) and a cylinder (102) are slidably mounted on one end of the fixed frame (100) close to the adjusting roller (300); two groups of symmetrically distributed cavities are arranged in the cylinder (102), and pistons are arranged in the cavities, each of which is connected to the two groups of adjusting rods (101); An adjusting roller (300) is movably mounted on a fixed frame (100) via an adjusting frame (301); an electromagnetic frame (600) is provided on the fixed frame (100) for driving the adjusting frame (301) to rotate; an adjusting shaft (500) is provided on the adjusting frame (301); a mounting column (502) is provided on the adjusting shaft (500) and is rotatably connected to the fixed frame (100); the mounting column (502) is in contact with the adjusting rod (101); and a semi-cam (501) is provided on the mounting column (502) for limiting its rotation angle; The detection member (400) is provided with two groups and is movably arranged on the fixed frame (100), wherein one group of the detection members (400) is located at a position close to the pressure roller (200) and the other group of the detection members (400) is located at a position close to the adjustment roller (300) and is used to detect the inclination of the substrate. Each group of the detection members (400) is provided with two groups of guide wheels (420) for contacting with two sides of the substrate. The fixed frame (100) is provided with a connecting block (410) for installing the detection member (400). (400) is rotatably arranged on the connecting block (410) via a rotating shaft (411), and a slide groove (401) is provided on the detection member (400) for the rotating shaft (411) to slide, and a trigger switch (403) for starting the electromagnetic frame (600) and two groups of piston tubes (402) symmetrically distributed on both sides of the trigger switch (403) are provided on the detection member (400), and the two groups of piston tubes (402) are respectively connected to the two cavities on the cylinder (102) through the air inlet pipe (103); The electromagnetic frame (600) is provided with two groups of electromagnets, and the two groups of electromagnets are symmetrically distributed on the electromagnetic frame (600) and located at two ends close to the adjustment frame (301), and a magnetic block is correspondingly provided on one side of the adjustment frame (301) close to the electromagnetic frame (600).

2. The rotary flexographic printing press according to claim 1, characterized in that: The guide wheel (420) is composed of two sets of pulleys that are bonded together, so as to better fit the substrate and facilitate guiding substrates of different thicknesses.

3. The rotary flexographic printing press according to claim 1, characterized in that: Two groups of guide wheels (420) are provided on each group of detection members (400); the guide wheels (420) are slidably mounted on the detection members (400) via guide rods; and the detection members (400) are provided with threaded rods for adjusting the height of the guide wheels (420).

4. The rotary flexographic printing press according to claim 3, characterized in that: The guide wheel (420) is rotatably connected to the guide rod, and a nut for locking the guide wheel (420) is provided on the guide rod.

5. The rotary flexographic printing press according to claim 4, characterized in that: The fixing frame (100) is composed of two rectangular frames, which facilitates the adjustment of the height of the guide wheel (420) on the detection member (400).

6. The rotary flexographic printing press according to claim 1, characterized in that: The pressing roller (200) is arranged on the fixing frame (100) via a supporting frame, and two ends of the pressing roller (200) are elastically connected to two ends of the supporting frame.

7. The rotary flexographic printing press according to claim 1, characterized in that: The fixing frame (100) is provided with an elastic member (503) for resetting the mounting column (502), and the mounting column (502) is correspondingly provided with an annular groove for mounting the elastic member (503).

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