Printing machine roller

Abstract

The invention belongs to the technical field of printing machines, and particularly relates to a printing machine roller which comprises a printing roller body and a reel, and tensioning assemblies are connected to the two ends of the printing roller body; the tensioning assembly comprises a plurality of connecting blocks, the connecting blocks are sequentially and rotationally connected end to end, a driving assembly is arranged between every two adjacent connecting blocks, the connecting block at the head end is fixedly connected with the printing roller body, the connecting block at the tail end is fixedly connected with a protruding block, and an installation assembly is arranged on the protruding block. A first clamping groove is formed in the printing roller body, and a second clamping groove is formed in the reel. The flexible printing plate is pulled to a proper tensioning state firstly, then the flexible printing plate is gradually wound on the printing roller body through the tensioning assembly, relative sliding between the flexible printing plate and the printing roller body caused by the fact that the flexible printing plate is wound first and then tensioned is avoided, and therefore the situation that the flexible printing plate is deformed due to uneven stress in the tensioning process is avoided; and the printing quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of printing machines, and in particular relates to a printing machine roller. Background Art

[0002] The printing press roller is an indispensable and important component of the printing press, which is used to transfer ink, support paper, control printing pressure, etc. Among them, the flexographic printing plate is a flexible printing plate made of polymer materials, which is mainly used in flexographic printing process. It transfers ink to the substrate by engraving or making pictures on the surface of the printing plate to achieve the printing effect. When installing the flexographic printing plate on the printing press roller, the winding and tensioning of the flexographic printing plate are key steps in the flexographic printing process, which directly affect the printing quality and the service life of the printing plate. When installing the flexographic printing plate, it is usually first wound on the printing press roller, and then the flexographic printing plate is tightened and the flexographic printing plate is flat and fit on the roller, ensuring that the flexographic printing plate can maintain a stable position and shape during the printing process, thereby improving the accuracy and quality of printing.

[0003] For example, the invention patent application with publication number CN109367233A discloses an automatic plate rolling device and method for a corrugated box printing machine. The gear rack of the device is installed on the roller shaft of the printing roller, the first plate rolling gear and the second plate rolling gear are arranged in parallel on the gear rack, the telescopic rack is driven by the cylinder to mesh or separate with the first plate rolling gear, the second plate rolling gear is connected to the plate hanging shaft gear through the plate hanging gear, the plate hanging shaft gear is arranged at one end of the plate hanging shaft, and the plate hanging shaft is arranged parallel to the inner side of the printing roller. The invention controls the telescopic action of the telescopic rack to drive the movement of various gears, thereby realizing automatic plate hanging, which has the advantages of convenient overall operation, effective prevention of human errors, and improved printing accuracy.

[0004] However, the invention has the following disadvantages during use: when the rubber plate is tightened, the relative sliding between the rubber plate and the printing roller causes uneven friction between the rubber plate and the printing roller, which causes uneven force on the rubber plate, easily causing deformation of the rubber plate and affecting the printing quality. The rubber plate here is also called a flexible printing plate. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the present invention provides a printing press roller.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A printing press roller comprises a printing roller body and a winding shaft, both ends of the printing roller body are connected with a tensioning assembly; the tensioning assembly comprises a plurality of connecting blocks which are rotatably connected head to tail in sequence, and a driving assembly is arranged between two adjacent connecting blocks; the connecting block at the head end is fixedly connected to the printing roller body, and the connecting block at the tail end is fixedly connected with a protrusion; the winding shaft is rotatably connected between the two protrusions; a first clamping groove is arranged on the printing roller body, and a second clamping groove is arranged on the winding shaft; when the tensioning assembly is in a straightened state, one end of a flexible printing plate is clamped into the first clamping groove, and the other end is clamped into the second clamping groove; the winding shaft is used to curl and tighten the flexible printing plate; the driving assembly is used to drive the corresponding connecting blocks to rotate and make the tensioning assembly form a circle coaxial with the printing roller body, and at the same time make the flexible printing plate gradually wind around the printing roller body.

[0007] Furthermore, a square groove is provided on the protrusion, a limit block is provided in the square groove for limiting sliding, a motor for driving the reel to rotate is fixedly connected to the limit block, and a pressure sensor is provided between the inner wall of the square groove on one side close to the tensioning assembly and the motor; when the flexible printing plate is wound and tightened on the reel, the motor moves toward the direction of the pressure sensor through the limit block.

[0008] Furthermore, a mounting assembly is provided on the protrusion; the mounting assembly includes a connecting shaft and a connecting sleeve; one end of the connecting shaft is fixedly connected to the output end of the motor, and a spring is provided between the other end and the connecting sleeve; the connecting shaft is limitedly slidably embedded in the connecting sleeve, a push groove is provided on the connecting sleeve, and a push block matching the push groove is provided on the reel; the connecting sleeve is embedded in the end of the reel and the push block is placed in the push groove.

[0009] Furthermore, a receiving groove for receiving the reel is axially provided on the circumferential surface of the printing roller body.

[0010] Furthermore, the driving assembly comprises a telescopic rod, and two ends of the telescopic rod are respectively hinged to the corresponding two connecting blocks.

[0011] Furthermore, a spline is fixedly connected to the connecting shaft, and a spline groove matching the spline is formed on the inner wall of the connecting sleeve.

[0012] Compared with the prior art, the present invention has the following beneficial effects: First, the flexible printing plate is pulled to a suitable tensioning state, and then the flexible printing plate is gradually wound on the printing roller body through the tensioning component to avoid relative sliding between the flexible printing plate and the printing roller body during the winding and tensioning process, thereby avoiding deformation of the flexible printing plate due to uneven force during the tensioning process, thereby improving printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 The present invention Figure 1 A magnified view of part A; Figure 3 The present invention Figure 1 A magnified view of part B; Figure 4 The present invention Figure 3 Enlarged view of part C; Figure 5 It is a schematic diagram of the matching of the connecting shaft and the connecting sleeve in the present invention; Figure 6 It is a schematic diagram of the structure of the scroll in the present invention; Figure 7 It is a schematic diagram of the state after the tensioning components of the present invention are formed into a circle; Figure 8 It is a schematic diagram of the state after the reel is stored in the receiving slot in the present invention; Fig. 9 is a cross-sectional view of a protrusion in the present invention; Fig.10 It is a simplified diagram of the process in which the tensioning components gradually form a circle in the present invention.

[0014] In the figure: 1, printing roller body; 2, rotating shaft; 3, first card slot; 4, square slot; 5, connecting block; 6, shaft; 7, groove; 8, telescopic rod; 9, protrusion; 10, motor; 11, limit block; 12, pressure sensor; 13, connecting shaft; 14, spline; 15, connecting sleeve; 16, spring; 17, push slot; 18, reel; 19, push block; 20, second card slot; 21, receiving slot. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0016] like Figure 1-Figure 10 As shown, the technical solution adopted by the present invention is as follows: A printing press roller comprises a printing roller body 1, a tensioning assembly and a reel 18. A rotating shaft 2 is coaxially fixedly arranged at both ends of the printing roller body 1. A first clamping groove 3 and a receiving groove 21 are axially provided on the outer circumference of the printing roller body 1. A second clamping groove 20 is axially provided on the reel 18. When in use, one end of a flexible printing plate is clamped into the first clamping groove 3, and the other end is clamped into the second clamping groove 20. When the flexible printing plate is wound on the printing roller body 1, the receiving groove 21 is used to store the reel 18.

[0017] Both ends of the printing roller body 1 are connected with tensioning assemblies. The two tensioning assemblies are symmetrically arranged. The tensioning assembly includes a plurality of connecting blocks 5, and the plurality of connecting blocks 5 are rotatably connected head to tail in sequence. The connecting block 5 at the head end of the tensioning assembly is fixedly connected to the printing roller body 1. In the same tensioning assembly, two adjacent connecting blocks 5 are rotatably connected via an axle rod 6. The plurality of axles 6 are located on the same side of the tensioning assembly. A driving assembly is arranged between two adjacent connecting blocks 5, and the driving assembly is located on the side of the connecting block 5 away from the axle rod 6. Under the action of the driving assembly between two adjacent connecting blocks 5, the plurality of connecting blocks 5 rotate around the corresponding axle rod 6 in sequence, so that the tensioning assembly gradually forms a circle coaxial with the printing roller body 1.

[0018] The driving assembly includes a telescopic rod 8. The telescopic rod 8 is an electric telescopic rod, which is a purchased part customized by the manufacturer and will not be described in detail. Between two adjacent connecting blocks 5, a groove 7 is provided on the side where the two connecting blocks 5 are close to each other, and a hinge shaft is provided in the groove 7. One end of the telescopic rod 8 is hinged to the hinge shaft in one of the connecting blocks 5, and the other end of the telescopic rod 8 is hinged to the hinge shaft in the other connecting block 5.

[0019] Starting from the head end of the tensioning assembly, the corresponding telescopic rods 8 are started in sequence, so that the distance between two adjacent connecting blocks 5 at the end away from the shaft 6 becomes larger, so that multiple connecting blocks 5 are rotated in sequence by a certain angle, so that the tensioning assembly forms a circle coaxial with the printing roller body 1.

[0020] The connecting block 5 at the end of the tensioning assembly is fixedly connected with a protrusion 9. Each protrusion 9 is provided with a mounting assembly, and the reel 18 is detachably mounted between two protrusions 9 through the mounting assembly.

[0021] A square groove 4 is provided on the protrusion 9, a limit groove is provided in the square groove 4, and a limit block 11 is provided in the limit groove for limit sliding. A motor 10 is provided in the square groove 4, and the motor 10 and the limit block 11 are fixedly connected. The motor 10 can move toward the direction close to the tensioning assembly or move away from the tensioning assembly through the limit block 11. A pressure sensor 12 is provided on the side of the motor 10 close to the tensioning assembly, and the pressure sensor 12 is fixed on the inner wall of the square groove 4. When the motor 10 moves toward the direction close to the tensioning assembly, the pressure sensor 12 can be triggered and the pressure value can be fed back.

[0022] The mounting assembly includes a connecting shaft 13 and a connecting sleeve 15. One end of the connecting shaft 13 is fixedly connected to the output end of the motor 10, and the other end of the connecting shaft 13 is limitedly slidably embedded in the connecting sleeve 15 and a spring 16 is fixedly connected between the connecting sleeve 15.

[0023] A spline 14 is fixedly arranged on the circumferential surface of the connecting shaft 13 in the axial direction, and a spline groove matching the spline 14 is opened on the inner wall of the connecting sleeve 15 in the axial direction. The spline 14 is slidably arranged in the spline groove, and the connecting shaft 13 and the connecting sleeve 15 are limitedly slidably matched through the spline 14.

[0024] A push groove 17 is provided on the outer circumference of the connecting sleeve 15. The reel 18 adopts a hollow structure, and a push block 19 matching the push groove 17 is fixed on the inner wall of the reel 18, and the push block 19 slides with the push groove 17. When the reel 18 is installed between the two protrusions 9, the connecting sleeve 15 is pushed to move the connecting sleeve 15 close to the connecting shaft 13, and then the reel 18 is placed between the two connecting sleeves 15, and the push block 19 corresponds to the push groove 17; then, the connecting sleeve 15 is released, and under the action of the spring 16, the connecting sleeve 15 moves away from the connecting shaft 13 and extends into the reel 18, and the push block 19 is stuck in the push groove 17. In this way, the motor 10 can drive the reel 18 to rotate and tighten the flexible printing plate through the cooperation of the connecting shaft 13 and the connecting sleeve 15.

[0025] The pressure sensor 12 and the motor 10 are both electrically connected to the controller. When the pressure value of the pressure sensor 12 reaches a preset value, the controller is operated to stop the motor 10.

[0026] Working principle of the present invention: Initially, the tensioning assembly is in a straight state, that is, it forms a straight line and is located at one side of the printing roller body 1.

[0027] When in use, one end of the flexible printing plate is inserted into the first slot 3 , and the other end is inserted into the second slot 20 on the reel 18 .

[0028] Then, the reel 18 is rotatably installed between the two protrusions 9, that is, the connecting sleeve 15 is embedded in the end of the reel 18 and the push block 19 is placed in the push groove 17. Specifically, the connecting sleeve 15 is pushed to move the connecting sleeve 15 close to the connecting shaft 13, and then the reel 18 is placed between the two connecting sleeves 15, and the push block 19 is opposite to the push groove 17, and then the connecting sleeve 15 is released. Under the action of the spring 16, the connecting sleeve 15 moves away from the connecting shaft 13 and then extends into the reel 18, and the push block 19 is stuck in the push groove 17.

[0029] At this time, the flexible printing plate is in a relaxed state. The motor 10 is started, the connecting shaft 13 drives the connecting sleeve 15 to rotate, the connecting sleeve 15 drives the reel 18 to rotate, and the flexible printing plate is gradually wound around the reel 18, thereby tightening the flexible printing plate. As the flexible printing plate is tightened, the motor 10 gradually moves toward the printing roller body 1, and the pressure sensor 12 is squeezed to generate a pressure value. The tightening state of the flexible printing plate can be judged by the pressure value of the pressure sensor 12. The greater the pressure value of the pressure sensor 12, the greater the tension on the flexible printing plate. When the pressure value of the pressure sensor 12 reaches the preset value, the motor 10 is stopped. At this time, the flexible printing plate is in a tensioned state and has a certain tension.

[0030] Then, multiple telescopic rods 8 are started in sequence from the head end to the tail end of the tensioning assembly, so that the tensioning assembly gradually forms a circle concentric with the printing roller body 1, and the flexible printing plate between the printing roller body 1 and the reel 18 is gradually wound around the printing roller body 1.

[0031] After the flexible printing plate between the printing roller body 1 and the reel 18 is wound on the printing roller body 1, the reel 18 is directly opposite to the receiving groove 21. Then the reel 18 is inserted into the receiving groove 21.

[0032] When necessary, the tensioning assembly is gradually extended into a straight line by shortening and retracting the telescopic rod 8.

[0033] In the present invention, the flexible printing plate is first pulled into a tensioned state and then gradually wound around the printing roller body 1 through the deformation of the tensioning assembly, thereby preventing the flexible printing plate from sliding on the printing roller body 1 and making the tension of the flexible printing plate uniform, thereby reducing the deformation of the flexible printing plate and improving the printing quality.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A printing press roller, comprising a printing roller body (1) and a reel (18), characterized in that: Both ends of the printing roller body (1) are connected to a tensioning assembly; the tensioning assembly comprises a plurality of connecting blocks (5) which are rotatably connected end to end in sequence, and a driving assembly is provided between two adjacent connecting blocks (5); the connecting block (5) at the head end is fixedly connected to the printing roller body (1), and the connecting block (5) at the tail end is fixedly connected to a protrusion (9); the reel (18) is rotatably connected between the two protrusions (9); a first clamping groove (3) is provided on the printing roller body (1), and a second clamping groove (20) is provided on the reel (18); when the tensioning assembly is in a straightened state, one end of the flexible printing plate is clamped into the first clamping groove (3), and the other end is clamped into the second clamping groove (20); the reel (18) is used to curl and tighten the flexible printing plate; the driving assembly is used to drive the corresponding connecting block (5) to rotate and make the tensioning assembly surround a circle coaxial with the printing roller body (1), and at the same time make the flexible printing plate gradually wind around the printing roller body (1).

2. The printing press roller according to claim 1, characterized in that: The protrusion (9) is provided with a square groove (4), a limit block (11) is provided in the square groove (4) for limiting sliding, a motor (10) for driving the reel (18) to rotate is fixedly connected to the limit block (11), and a pressure sensor (12) is provided between an inner wall of the square groove (4) on one side close to the tensioning assembly and the motor (10); when the flexible printing plate is wound and tightened on the reel (18), the motor (10) moves towards the direction of the pressure sensor (12) through the limit block (11).

3. The printing press roller according to claim 2, characterized in that: The protrusion (9) is provided with a mounting assembly; the mounting assembly comprises a connecting shaft (13) and a connecting sleeve (15); one end of the connecting shaft (13) is fixedly connected to the output end of the motor (10), and a spring (16) is provided between the other end and the connecting sleeve (15); the connecting shaft (13) is limitedly slidably embedded in the connecting sleeve (15), a push groove (17) is provided on the connecting sleeve (15), and a push block (19) matching the push groove (17) is provided on the reel (18); the connecting sleeve (15) is embedded in the end of the reel (18) and the push block (19) is placed in the push groove (17).

4. The printing press roller according to claim 1, characterized in that: A receiving groove (21) for receiving the reel (18) is provided on the circumferential surface of the printing roller body (1) along the axial direction.

5. The printing press roller according to claim 1, characterized in that: The driving assembly comprises a telescopic rod (8), and two ends of the telescopic rod (8) are respectively hinged to corresponding two connecting blocks (5).

6. The printing press roller according to claim 3, characterized in that: A spline (14) is fixedly connected to the connecting shaft (13), and a spline groove matching the spline (14) is formed on the inner wall of the connecting sleeve (15).

Images