Feeding structure of offset printing machine

Abstract

The utility model discloses a feeding structure of an offset printing machine, which relates to the technical field of offset printing machines and comprises a machine base, a lifting column and a workbench, the lifting column is connected inside the machine base through a driving mechanism, the workbench is fixedly connected to the top end of the lifting column, and a cover plate is connected to the corner of the machine base through a supporting column. A rail is installed in the middle of the bottom end of the cover plate, a base is slidably connected into the rail, the output end of an electric push column is connected with a servo motor, the output end of the servo motor is fixedly connected with a positioning seat, one side of the outer wall of the positioning seat is fixedly connected with a limiting piece, and the middle of the outer wall of the limiting piece is sleeved with a rotating disc. The middle of the outer wall of the rotating disc is fixedly connected with a limiting pin, and the outer wall of the limiting pin is connected with a rubber sleeve. According to the feeding structure of the offset printing machine, the rubber sleeve is driven by the servo motor to rotate, paper on the uppermost layer is separated through friction force, and the problem of feeding two or more pieces of paper is solved in cooperation with the adsorption effect of the suction cups.

Description

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[0001] The utility model relates to the technical field of offset printing presses, and specifically relates to a feeding structure of an offset printing press. Background Technique

[0002] An offset printing press is a printing device that uses offset printing technology. Its ink is not directly transferred from the printing plate to the printed material, but is first transferred to the blanket cylinder and then imprinted on the printed material by the blanket cylinder; the feeding structure of an offset printing press refers to a set of automated mechanical and pneumatic devices, whose function is to separate, pick up single sheets or continuously convey paper tapes from a paper stack or a reel, and accurately convey them to the first set of positioning mechanisms of the printing device, laying a foundation for subsequent accurate printing.

[0003] During the use of the existing feeding structure of a printing press, relying solely on the vacuum adsorption force of the suction cups and the blowing of the nozzles, it is difficult to overcome the electrostatic adsorption or ink adhesion between papers, which easily causes the suction cups to adsorb multiple papers at a time, resulting in inaccurate printing registration, a significant increase in the scrap rate of finished products, and frequent paper jams and paper blockages in the printing press. In severe cases, it will damage the core components such as the cylinders and rubber rollers of the printing unit. Content of the Utility Model

[0004] The purpose of the utility model is to provide a feeding structure of an offset printing press to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A feeding structure of an offset printing press, including a machine base, a lifting column and a workbench. The lifting column is connected inside the machine base through a driving mechanism, and the top of the lifting column is fixedly connected with the workbench. The corners of the machine base are connected with a cover plate through support columns. In the middle of the bottom end of the cover plate, a track is installed. Inside the track, a base is slidably connected. On both sides of the bottom end of the base, electric push rods are installed, and the bottom output ends of the electric push rods are fixedly connected with positioning plates. On both sides of the bottom end of the positioning plate, suction cups are connected. On the corners of the outer wall of the workbench, columns are slidably connected; on both sides of the top end of the machine base, support plates are fixedly connected, and in the middle of the support plates, electric push columns are installed. The output end of the electric push column is connected with a servo motor, and the output end of the servo motor is fixedly connected with a positioning seat. On one side of the outer wall of the positioning seat, a limiting member is fixedly connected, and on one side of the outer wall of the limiting member, an extension column is fixedly connected. In the middle of the outer wall of the limiting member, a turntable is sleeved, and in the middle of the outer wall of the turntable, a limiting pin is fixedly connected, and a rubber sleeve is connected to the outer wall of the limiting pin;

[0006] The limiting member is used to drive the turntable to rotate, and the rubber sleeve can rotate with the turntable for separating papers.

[0007] Preferably, the limiting pins are distributed at equal angles, and the cross-section of the limiting pin is in the shape of a "dry" character structure. The limiting member is a hexagonal structure, and the bottom end of the column is fixedly connected with the workbench.

[0008] Operators can simply pull the rubber sleeve to disconnect it from the limit pin, thus quickly disassembling the limit pin. This allows users to flexibly adjust the number and arrangement density of the rubber sleeves to accommodate both thin and thick paperboard.

[0009] Preferably, the turntable has an "O" shaped structure, and a limiting groove corresponding to the limiting member is provided in the middle of the turntable. A retaining spring is sleeved in the middle of the outer wall of the extension column, and the retaining spring has an "Ω" shaped structure. Fixing holes corresponding to the retaining spring are provided on both sides of the outer wall of the extension column.

[0010] When installing the turntable, the user moves the turntable so that its center passes through the extension column and moves it to the limiting part until one side of the turntable is in contact with the positioning seat. Then, the user moves the retaining spring to be sleeved on the outside of the extension column. At this time, the two sides of the bottom end of the retaining spring are inserted into the inside of the extension column, and the outer wall of the retaining spring is in contact with the other side of the turntable, thereby locking the turntable.

[0011] Preferably, a first stud is rotatably connected to one side of the workbench, and a second stud is rotatably connected to the other side of the workbench. A first fixing seat is threadedly connected to the outer wall of the first stud, and a second fixing seat is threadedly connected to the outer wall of the second stud. A groove corresponding to the first and second fixing seats is provided in the middle of the workbench.

[0012] Rotating stud number one causes fixed seat number one to move vertically, and rotating stud number two causes fixed seat number two to move horizontally until both fixed seats number one and two are in contact with the outer wall of the paper stack, thereby restricting the paper stack and aligning it.

[0013] As can be seen from the above, the feeding structure of the offset printing machine provided by this utility model has the following beneficial effects.

[0014] By using a servo motor to drive the rubber sleeve to rotate, friction is used to separate the top layer of paper. Combined with the suction cup, this solves the problem of feeding two or more sheets of paper, improving printing registration accuracy and yield.

[0015] The No. 1 and No. 2 fixed seats can be adjusted by screws to achieve precise positioning and alignment of the paper stack, avoiding conveying deviations caused by paper stack skewing and ensuring the stability of subsequent printing processes.

[0016] The rubber sleeves adopt a quick-release structure, which can be quickly disassembled and replaced; the turntable is locked by a snap ring, simplifying the installation and disassembly process, thereby reducing equipment maintenance costs and downtime; and the number and arrangement density of the rubber sleeves can be flexibly adjusted, so that the mechanism can adapt to substrates of different weights and materials, such as thin paper and thick cardboard. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall partial structure of this utility model;

[0019] Figure 3 This is a three-dimensional structural diagram of the workbench and column of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the base, electric push rod, and positioning plate of this utility model;

[0021] Figure 5 This is a top view of the stud and fixing base of this utility model;

[0022] Figure 6 This is a three-dimensional structural diagram of the support plate, electric push column, and servo motor of this utility model;

[0023] Figure 7 This is a three-dimensional structural diagram of the turntable and rubber sleeve of this utility model;

[0024] Figure 8 This is a three-dimensional cross-sectional view of the turntable, limiting pin, and rubber sleeve of this utility model;

[0025] Figure 9 This is a three-dimensional structural diagram of the positioning seat, limiting component, extension column, and retaining spring of this utility model.

[0026] In the diagram: 1. Base; 2. Lifting column; 3. Worktable; 4. Rail; 5. Base; 6. Electric push rod; 7. Positioning plate; 8. Suction cup; 9. Column; 10. Support plate; 11. Electric push column; 12. Servo motor; 13. Positioning seat; 14. Limiting component; 15. Extension column; 16. Turntable; 17. Limiting pin; 18. Rubber sleeve; 19. Snap ring; 20. Stud No. 1; 21. Stud No. 2; 22. Fixed seat No. 1; 23. Fixed seat No. 2. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-9, the utility model provides a technical solution: a feeding structure of an offset printing press, which includes a machine base 1, a lifting column 2 and a workbench 3. The lifting column 2 is connected inside the machine base 1 through a driving mechanism, and the top end of the lifting column 2 is fixedly connected with the workbench 3. The corners of the machine base 1 are connected with a cover plate through support columns. A track 4 is installed in the middle of the bottom end of the cover plate. A base 5 is slidably connected inside the track 4. Electric push rods 6 are installed on both sides of the bottom end of the base 5, and the bottom output ends of the electric push rods 6 are fixedly connected with a positioning plate 7. Suction cups 8 are connected to both sides of the bottom end of the positioning plate 7. Columns 9 are slidably connected to the corners of the outer wall of the workbench 3. Support plates 10 are fixedly connected to both sides of the top end of the machine base 1, and an electric push column 11 is installed in the middle of the support plates 10. The output end of the electric push column 11 is connected with a servo motor 12, and the output end of the servo motor 12 is fixedly connected with a positioning seat 13. A limiting member 14 is fixedly connected to one side of the outer wall of the positioning seat 13, and an extension column 15 is fixedly connected to one side of the outer wall of the limiting member 14. A turntable 16 is sleeved in the middle of the outer wall of the limiting member 14, and a limiting pin 17 is fixedly connected to the middle of the outer wall of the turntable 16. A rubber sleeve 18 is connected to the outer wall of the limiting pin 17;

[0029] The limiting member 14 is used to drive the turntable 16 to rotate, and the rubber sleeve 18 can rotate with the turntable 16 for separating paper;

[0030] The limiting pins 17 are distributed at equal angles, and the cross-section of the limiting pin 17 is in a "dry" shape structure. The limiting member 14 is a hexagonal structure, and the bottom end of the column 9 is fixedly connected to the workbench 3; The turntable 16 is in an "O" shape structure, and a limiting groove corresponding to the limiting member 14 is opened in the middle of the turntable 16. A snap ring 19 is sleeved in the middle of the outer wall of the extension column 15, and the snap ring 19 is in a "Ω" shape structure. Fixing holes corresponding to the snap ring 19 are opened on both sides of the outer wall of the extension column 15; One end of the workbench 3 is rotatably connected with a first screw column 20, and the other end of the workbench 3 is rotatably connected with a second screw column 21. A first fixing seat 22 is threadedly connected to the outer wall of the first screw column 20, and a second fixing seat 23 is threadedly connected to the outer wall of the second screw column 21. A sliding groove corresponding to the first fixing seat 22 and the second fixing seat 23 is opened in the middle of the workbench 3.

[0031] During specific implementation, refer to Figure 1 , Figure 2 , Figure 3 and Figure 4After the operator places the neatly stacked printing papers on top of the worktable 3, the power mechanism inside the base 1 is activated, driving the lifting column 2 to move the worktable 3 upward, so that the paper stack on top of the worktable 3 is close to the positioning plate 7. During this process, the column 9 guides the movement of the worktable 3 to ensure its smooth lifting and lowering. Subsequently, the electric push rod 6 at the bottom of the base 5 extends, driving the positioning plate 7 to bring the suction cup 8 into contact with the paper stack. After the suction cup 8 completes the adsorption of the paper, the base 5 moves along the track 4 to the printing press inlet to complete the conveying of a single sheet of paper. As the height of the paper stack decreases or is exhausted, the lifting column 2 can drive the worktable 3 to automatically lift and lower to keep the relative position of the top of the paper stack and the suction cup 8 constant, so as to achieve continuous paper feeding.

[0032] See Figure 3 and Figure 5 After the stacked papers are moved to the top of the workbench 3, the operator can rotate the first stud 20 to drive the first fixed seat 22 to move vertically; rotate the second stud 21 to drive the second fixed seat 23 to move horizontally until both the first fixed seat 22 and the second fixed seat 23 are in contact with the outer wall of the paper stack, thereby limiting and aligning the paper stack and ensuring that the edges of the paper stack are neat.

[0033] See Figure 6 and Figure 7 When the suction cup 8 contacts the paper, the electric push column 11 in the middle of the support plate 10 is activated. The electric push column 11 extends and drives the servo motor 12 to move upward to the designated position. At this time, the rubber sleeve 18 contacts the top layer of paper in the paper stack due to its own elasticity and friction. Then, the servo motor 12 is activated to drive the positioning seat 13 and the limiting member 14 connected to it to rotate. The limiting member 14 drives the turntable 16 to rotate. The turntable 16 further drives the limiting pin 17 and the rubber sleeve 18 connected to it to rotate synchronously. When the rubber sleeve 18 rotates, the friction force generated between it and a single sheet of paper is greater than the adhesion force between the sheets, thereby separating the top layer of paper from the paper stack and ensuring that the suction cup 8 only picks up one sheet of paper at a time, effectively preventing double or multiple sheets from being fed.

[0034] See Figure 8 Operators can directly pull the rubber sleeve 18 to disengage it from the limit pin 17, enabling quick disassembly of the rubber sleeve 18. This allows users to flexibly adjust the number and arrangement density of the rubber sleeves 18, making the mechanism adaptable to different specifications of printing substrates such as thin paper and thick cardboard.

[0035] See Figure 9 When the user installs the turntable 16, the turntable 16 is moved so that its center passes through the extension post 15 until one side of the turntable 16 is in contact with the positioning seat 13; then the retaining spring 19 is sleeved on the outside of the extension post 15, so that the two sides of the bottom end of the retaining spring 19 are inserted into the inside of the extension post 15, and the outer wall of the retaining spring 19 is in contact with the other side of the turntable 16, thereby realizing the quick locking of the turntable 16.

[0036] This solution uses a servo motor 12 to drive the rubber sleeve 18 to rotate, using friction to separate the top layer of paper. Combined with the adsorption effect of the suction cup 8, it solves the problem of feeding two or more sheets of paper, improving printing registration accuracy and yield.

[0037] The No. 1 fixing seat 22 and the No. 2 fixing seat 23 can be adjusted by screws to achieve precise positioning and alignment of the paper stack, avoiding conveying deviation caused by paper stack skewing and ensuring the stability of subsequent printing processes.

[0038] The rubber sleeve 18 adopts a quick-release structure, which can be quickly disassembled and replaced; the turntable 16 is locked by the snap ring 19, simplifying the installation and disassembly process, thereby reducing equipment maintenance costs and downtime; and the number and arrangement density of the rubber sleeves 18 can be flexibly adjusted, so that the mechanism can adapt to substrates of different weights and materials such as thin paper and thick cardboard.

[0039] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. A feeding structure of an offset printing press, comprising a machine base (1), a lifting column (2) and a workbench (3). The inside of the machine base (1) is connected with a lifting column (2) through a driving mechanism, and the top end of the lifting column (2) is fixedly connected with a workbench (3). The corners of the machine base (1) are connected with a cover plate through support columns, and a track (4) is installed in the middle of the bottom end of the cover plate. A base (5) is slidably connected inside the track (4). It is characterized in that: On both sides of the bottom end of the base (5), electric push rods (6) are installed, and the bottom output ends of the electric push rods (6) are fixedly connected with positioning plates (7). On both sides of the bottom end of the positioning plate (7), suction cups (8) are connected. Columns (9) are slidably connected to the outer corners of the workbench (3). On both sides of the top end of the machine base (1), support plates (10) are fixedly connected, and an electric push column (11) is installed in the middle of the support plates (10). The output end of the electric push column (11) is connected with a servo motor (12), and the output end of the servo motor (12) is fixedly connected with a positioning seat (13). On one side of the outer wall of the positioning seat (13), a limiting member (14) is fixedly connected, and on one side of the outer wall of the limiting member (14), an extension column (15) is fixedly connected. A turntable (16) is sleeved in the middle of the outer wall of the limiting member (14), and a limiting pin (17) is fixedly connected to the middle of the outer wall of the turntable (16). And a rubber sleeve (18) is connected to the outer wall of the limiting pin (17); The limiting member (14) is used to drive the turntable (16) to rotate, and the rubber sleeve (18) can rotate along with the turntable (16) for separating paper.

2. The offset press feed structure of claim 1 wherein: The limiting pins (17) are distributed at equal angles, and the cross section of the limiting pin (17) is in a "dry" - shaped structure. The limiting member (14) is in a hexagonal structure. The bottom end of the column (9) is fixedly connected to the workbench (3).

3. The offset press feed structure of claim 2 wherein: The turntable (16) is in an "O" - shaped structure, and a limiting groove corresponding to the limiting member (14) is opened in the middle of the turntable (16). A snap ring (19) is sleeved in the middle of the outer wall of the extension column (15), and the snap ring (19) is in an "Ω" - shaped structure. And fixing holes corresponding to the snap ring (19) are opened on both sides of the outer wall of the extension column (15).

4. The offset press feed structure of claim 3 wherein: On one side inside the workbench (3), a first screw rod (20) is rotatably connected, and on the other side inside the workbench (3), a second screw rod (21) is rotatably connected. A first fixing seat (22) is threadedly connected to the outer wall of the first screw rod (20). A second fixing seat (23) is threadedly connected to the outer wall of the second screw rod (21). And a sliding groove corresponding to the first fixing seat (22) and the second fixing seat (23) is opened in the middle of the workbench (3).

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