Intermittent size roller device for letterpress printing

Abstract

The invention discloses an intermittent size roller device for letterpress printing, relates to the technical field of letterpress printing equipment, and aims to solve the problems that a size roller needs to be frequently replaced, the operation is complicated and the printing precision is insufficient in a traditional device. The device comprises a main traction mechanism, a printing mechanism, a transmission mechanism, a detection control mechanism and a size roller driving mechanism, the main traction mechanism drives a printing film to be conveyed, the printing mechanism achieves pattern transfer printing through an engraving offset plate on the surface of a size roller, the transmission mechanism guarantees synchronous rotation of all components, the detection control mechanism accurately monitors the conveying length of the film and the position of the engraving offset plate, and the size roller driving mechanism adopts a servo motor to drive the size roller to intermittently rotate. The device can adapt to different printing length requirements without changing size rollers, through cooperative work of all mechanisms, the printing precision and efficiency are improved, the production cost is reduced, and the device is suitable for various letterpress printing scenes.

Description

Technical Field

[0001] This invention belongs to the technical field of letterpress printing equipment, and in particular relates to a letterpress printing intermittent size roller device. Background Technology

[0002] In letterpress printing, traditional printing equipment transfers the pattern onto a film using an engraved stencil on a size roller, with all components rotating synchronously via gear transmission. When printing patterns of different lengths, it is necessary to change the size roller with the corresponding outer diameter to match the printing length. This operation is cumbersome, and the change process can easily affect the synchronization accuracy of the equipment, causing the printed pattern to shift. Furthermore, frequent changes to the size roller reduce printing efficiency and increase production costs.

[0003] To solve the above problems, there is an urgent need to design a letterpress printing intermittent size roller device that can adapt to different printing length requirements without changing the size roller, and can ensure printing accuracy and efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide an intermittent dimension roller device for letterpress printing, which solves the problems of frequent dimension roller replacement, cumbersome operation, and insufficient printing accuracy of traditional devices.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to an intermittent dimensioning roller device for letterpress printing, comprising a main traction mechanism, a printing mechanism, a transmission mechanism, a detection and control mechanism, and a dimensioning roller drive mechanism. The main traction mechanism includes a main traction roller and a main traction motor. The main traction motor is connected to the main traction roller via a synchronous belt and is used to drive the main traction roller to rotate in order to traction the printing film for transport. The printing mechanism includes a size roller, an engraving plate, an anilox roller, an ink roller, a printing base roller, and an ink cartridge. The engraving plate is fixed to the surface of the size roller. The ink cartridge is used to store ink. The ink is transferred to the engraving plate through the contact and rotation between the ink roller and the anilox roller. The printing base roller cooperates with the main traction roller to transport the printing film. When the size roller rotates, it drives the engraving plate to transfer the pattern to the printing film. The transmission mechanism includes a traction roller gear, a transmission gear, a printing bottom roller gear A, a printing bottom roller gear B, and a bridge gear. The anilox roller and the ink roller are both fixed with a synchronous gear on one side. The other end of the anilox roller is fixed with a drive gear that meshes with the bridge gear. The drive gear rotates synchronously with the main traction roller through the meshing transmission of the traction roller gear, the transmission gear, the printing bottom roller gear A, the printing bottom roller gear B, and the bridge gear. The detection and control mechanism includes an optical encoder, a coupling, a cam, and a sensor. The optical encoder is connected to the output shaft of the main traction motor via the coupling and is used to measure the rotation speed of the main traction motor shaft to calculate the conveying length of the printing film. The cam is fixed on the shaft of the dimensional roller, and the sensor is arranged opposite to the cam to detect the position of the engraving plate. The size roller drive mechanism is a size roller motor composed of a servo motor. The size roller motor is connected to the size roller via a synchronous belt. The size roller motor is activated by receiving a signal from the optical code disk, which drives the size roller to rotate one revolution to complete the pattern transfer. When the size roller motor is not activated, the sensor controls the engraving plate to stay in a position that does not contact the printing base roller and the anilox roller through the cam.

[0006] In one embodiment, the engraving stencil and the dimensional roller are detachably bonded together.

[0007] In one embodiment, the sensor is a position sensor used to monitor the rotational position of the cam in real time to provide feedback on the state of the dimensional roller.

[0008] In one embodiment, the optical encoder is an incremental optical encoder that calculates the revolutions of the main traction motor by recording the number of pulses.

[0009] In one embodiment, the bridge gear is rotatably connected to a shaft at one end of the dimensional roller, and the bridge gear meshes with the printing bottom roller gear B and the drive gear respectively.

[0010] In one embodiment, the transmission gears are configured as two sets, and the traction roller gear, transmission gear, printing bottom roller gear A and printing bottom roller gear B are of the same size. The traction roller gear is fixed on the rotating shaft at one end of the main traction roller, and the printing bottom roller gear A and printing bottom roller gear B are fixed on the rotating shaft at one end of the printing bottom roller.

[0011] In one embodiment, the traction roller gear, the transmission gear, and the printing bottom roller gear A are located at the same horizontal position, and the traction roller gear, the two transmission gears, and the printing bottom roller gear A are meshed with each other in pairs.

[0012] In one embodiment, the two drive gears are rotatably mounted between the traction roller gear and the printing bottom roller gear A.

[0013] In one embodiment, the ink cartridge is located directly below the ink roller, and the shape and size of the ink cartridge are adapted to the ink roller.

[0014] In one embodiment, an auxiliary traction roller is disposed directly above the main traction roller, and the printed film passes between the main traction roller and the auxiliary traction roller.

[0015] The present invention has the following beneficial effects: This invention uses a size roller motor to drive the size roller to rotate intermittently, combined with an optical encoder to accurately detect the length of the printed film. It can meet the printing needs of patterns of different lengths without changing size rollers of different outer diameters, avoiding the cumbersome operation of frequently changing size rollers in traditional devices and greatly shortening the preparation time.

[0016] In this invention, the transmission mechanism uses multiple sets of gear meshing to ensure that the anilox roller, printing base roller and main traction roller rotate synchronously; the detection and control mechanism uses a position sensor and cam to monitor the position of the engraving plate in real time, while the incremental optical code disk accurately calculates the film conveying length. With this dual protection, the pattern position is effectively avoided, and the consistency and pass rate of printed products are improved.

[0017] This invention eliminates the need for frequent disassembly and replacement of the size roller, reducing equipment downtime and significantly improving the efficiency of continuous printing operations. The engraving plate uses a detachable adhesive connection, facilitating quick replacement according to pattern requirements and reducing mold replacement costs. When the size roller motor is not running, the engraving plate remains in a non-contact position, reducing component wear and ink waste, further lowering production and maintenance costs.

[0018] In this invention, the various components are rationally connected, the gear transmission is smooth, and the auxiliary traction roller ensures the stability of the printed film transport. The overall structural design takes into account both practicality and durability, making it suitable for long-term continuous printing operations and improving the service life and operational reliability of the equipment.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an intermittent dimension roller device for letterpress printing; Figure 2 for Figure 1 Sectional view of AA in the middle; Figure 3 for Figure 1 Cross-sectional view of the middle section (BB); Figure 4 A partial top view of an intermittent dimension roller device for letterpress printing; Figure 5 This is a schematic diagram of a traditional printing roller structure.

[0022] The attached diagram lists the components represented by each number as follows: 1. Dimensioning roller; 2. Engraving plate; 3. Anilox roller; 4. Ink roller; 5. Main traction roller; 6. Printing bottom roller; 7. Bridge gear; 8. Printing bottom roller gear B; 9. Traction roller gear; 10. Printing bottom roller gear A; 11. Transmission gear; 12. Main traction motor; 13. Optical encoder; 14. Ink cartridge; 15. Dimensioning roller motor; 16. Sensor; 17. Cam; 18. Printing film; 19. Synchronizing gear; 20. Drive gear; 21. Coupling; 22. Auxiliary traction roller. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "upper," "middle," "outer," "inner," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Example 1 Please see Figures 1-5 As shown, the present invention is an intermittent dimensional roller device for letterpress printing, which mainly consists of five core parts: a main traction mechanism, a printing mechanism, a transmission mechanism, a detection and control mechanism, and a dimensional roller drive mechanism. All components work together to ensure the smooth progress of the printing operation.

[0027] The core organizational structure includes: Main traction mechanism: The core components include the main traction roller 5 and the main traction motor 12. The main traction motor 12 is connected to the main traction roller 5 via a synchronous belt. Its core function is to drive the main traction roller 5 to rotate. The main traction roller 5 cooperates with the auxiliary traction roller 22 to stably transport the printing film 18 between the main traction roller 5 and the auxiliary traction roller 22, providing continuous and uniform material transport power for the printing operation.

[0028] The printing mechanism includes a size roller 1, an engraving plate 2, an anilox roller 3, an ink roller 4, a printing base roller 6, and an ink cartridge 14. The engraving plate 2 is fixed to the surface of the size roller 1 by a detachable adhesive connection, which is convenient for replacement according to the printing pattern requirements. The ink cartridge 14 is located directly below the ink roller 4, and its shape and size are adapted to the ink roller 4. It is used to store ink. The ink is transferred to the engraving plate 2 through the contact rotation between the ink roller 4 and the anilox roller 3. The printing base roller 6 cooperates with the main traction roller 5 to transport the printing film 18. When the size roller 1 rotates, it drives the engraving plate 2 to accurately transfer the pattern onto the printing film 18.

[0029] Transmission mechanism: It consists of traction roller gear 9, transmission gear 11, printing bottom roller gear A10, printing bottom roller gear B8, bridge gear 7, synchronization gear 19 and drive gear 20. Both the anilox roller 3 and the ink roller 4 have a synchronous gear 19 fixed to one end on the same side. The other end of the anilox roller 3 has a drive gear 20 that meshes with the bridge gear 7. The bridge gear 7 is rotatably connected to a shaft at one end of the size roller 1 and meshes with the printing bottom roller gear B8 and the drive gear 20, respectively. Two sets of transmission gears 11 are rotatably mounted between the traction roller gear 9 and the printing bottom roller gear A10. The traction roller gear 9, transmission gear 11, printing bottom roller gear A10, and printing bottom roller gear B8 are of the same size. The traction roller gear 9 is fixed to a shaft at one end of the main traction roller 5, and the printing bottom roller gear A10 and printing bottom roller gear B8 are fixed to a shaft at one end of the printing bottom roller 6. The traction roller gear 9, transmission gear 11, and printing bottom roller gear A10 are located at the same horizontal position, and adjacent gears mesh with each other. Through the coordinated meshing of the above gears, the drive gear 20 rotates synchronously with the printing bottom roller 6 and the main traction roller 5, ensuring that the actions of each component are coordinated and consistent during the printing process.

[0030] The detection and control mechanism includes an optical encoder 13, a coupling 21, a cam 17, and a sensor 16. The optical encoder 13 is an incremental optical encoder, connected to the output shaft of the main traction motor 12 via the coupling 21. It can record the number of pulses to calculate the rotational speed of the main traction motor 12, thereby accurately measuring the conveying length of the printing film 18. The cam 17 is fixed on the shaft of the size roller 1. The sensor 16 is a position sensor, set opposite to the cam 17, used to monitor the rotational position of the cam 17 in real time, thereby providing feedback on the status of the size roller 1 and achieving accurate detection of the position of the engraving plate 2.

[0031] Size roller drive mechanism: Size roller motor 15, which is composed of a servo motor, is connected to size roller 1 via a synchronous belt. Size roller motor 15 starts after receiving a signal from optical encoder 13, driving size roller 1 to rotate one revolution to complete one pattern transfer; when size roller motor 15 is not started, sensor 16 controls the engraving plate 2 to stay in a position that does not contact printing base roller 6 and anilox roller 3 via cam 17, so as to avoid unnecessary contact that may cause component wear or ink waste.

[0032] Example 2 Please see Figures 1-4 As shown, this embodiment illustrates a method of using an intermittent dimension roller device for letterpress printing: In operation, the operator first fixes the corresponding engraving plate 2 to the surface of the size roller 1 using a detachable adhesive connection according to the printing pattern requirements. Then, the main traction motor 12 is started, driving the main traction roller 5 to rotate via a synchronous belt. The main traction roller 5 cooperates with the auxiliary traction roller 22 to stably pass and transport the printing film 18 between them. Simultaneously, the ink in the ink cartridge 14 is transferred to the engraving plate 2 through the contact rotation between the ink roller 4 and the anilox roller 3. Under the action of the transmission mechanism, the drive gear 20 at one end of the anilox roller 3 meshes with the printing base roller gear B8 via the bridge gear 7. At the same time, the traction roller gear 9, the transmission gear 11, and the printing base roller gear A10 mesh with each other, ensuring that the drive gear 20 rotates synchronously with the printing base roller 6 and the main traction roller 5, guaranteeing coordinated operation of all components during the printing process. The optical encoder 13 in the detection and control mechanism is connected to the output shaft of the main traction motor 12 via a coupling 21. It records the number of pulses to calculate the rotation speed of the main traction motor 12, thereby accurately measuring the conveying length of the printing film 18. When the printing film 18 is conveyed to the appropriate position, the size roller motor 15 starts after receiving a signal from the optical encoder 13, driving the size roller 1 to rotate one revolution. As the size roller 1 rotates, it drives the pattern plate 2 to accurately transfer the pattern onto the printing film 18, completing one pattern transfer. When pattern transfer is not required, the size roller motor 15 does not start, and the sensor 16 controls the pattern plate 2 via the cam 17 to remain in a position that does not contact the printing base roller 6 and the anilox roller 3, avoiding unnecessary contact that could cause component wear or ink waste. Throughout the printing process, all mechanisms work together, enabling adaptation to different printing length requirements without frequent size roller changes, while ensuring printing accuracy and efficiency.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for intermittent dimensioning rollers in letterpress printing, characterized in that, It includes the main traction mechanism, printing mechanism, transmission mechanism, detection and control mechanism, and size roller drive mechanism; The main traction mechanism includes a main traction roller (5) and a main traction motor (12). The main traction motor (12) is connected to the main traction roller (5) via a synchronous belt and is used to drive the main traction roller (5) to rotate in order to pull the printed film (18) for transport. The printing mechanism includes a size roller (1), an engraving plate (2), an anilox roller (3), an ink roller (4), a printing base roller (6), and an ink cartridge (14). The engraving plate (2) is attached and fixed to the surface of the size roller (1). The ink cartridge (14) is used to store ink. The ink is transferred to the engraving plate (2) through the contact rotation between the ink roller (4) and the anilox roller (3). The printing base roller (6) cooperates with the main traction roller (5) to transport the printing film (18). When the size roller (1) rotates, it drives the engraving plate (2) to transfer the pattern to the printing film (18). The transmission mechanism includes a traction roller gear (9), a transmission gear (11), a printing bottom roller gear A (10), a printing bottom roller gear B (8), and a bridge gear (7). The anilox roller (3) and the ink roller (4) are both fixed with a synchronous gear (19) on one side. The other end of the anilox roller (3) is fixed with a drive gear (20) that meshes with the bridge gear (7). The drive gear (20) rotates synchronously with the main traction roller (5) through the meshing transmission of the traction roller gear (9), the transmission gear (11), the printing bottom roller gear A (10), the printing bottom roller gear B (8), and the bridge gear (7). The detection and control mechanism includes an optical encoder (13), a coupling (21), a cam (17), and a sensor (16). The optical encoder (13) is connected to the output shaft of the main traction motor (12) through the coupling (21) and is used to measure the number of rotations of the main traction motor (12) shaft to calculate the conveying length of the printed film (18). The cam (17) is fixed on the shaft of the size roller (1), and the sensor (16) is arranged opposite to the cam (17) to detect the position of the engraving plate (2). The size roller drive mechanism is a size roller motor (15) composed of a servo motor. The size roller motor (15) is connected to the size roller (1) via a synchronous belt. The size roller motor (15) receives a signal from the optical code disk (13) to start and drive the size roller (1) to rotate one revolution to complete the pattern transfer. When the size roller motor (15) is not started, the sensor (16) controls the engraving plate (2) to stay in a position that does not contact the printing base roller (6) and the anilox roller (3) through the cam (17).

2. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The engraving stencil (2) and the dimensional roller (1) are detachably bonded together.

3. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The sensor (16) is a position sensor used to monitor the rotation position of the cam (17) in real time to provide feedback on the status of the size roller (1).

4. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The optical encoder (13) is an incremental optical encoder, which calculates the number of revolutions of the main traction motor (12) by recording the number of pulses.

5. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The bridge gear (7) is rotatably connected to the shaft at one end of the size roller (1), and the bridge gear (7) meshes with the printing bottom roller gear B (8) and the drive gear (20) respectively.

6. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The transmission gear (11) is set in two sets. The traction roller gear (9), transmission gear (11), printing bottom roller gear A (10) and printing bottom roller gear B (8) are the same size. The traction roller gear (9) is fixed on the rotating shaft at one end of the main traction roller (5). The printing bottom roller gear A (10) and printing bottom roller gear B (8) are fixed on the rotating shaft at one end of the printing bottom roller (6).

7. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The traction roller gear (9), transmission gear (11) and printing bottom roller gear A (10) are located at the same horizontal position, and the traction roller gear (9), the two transmission gears (11) and the printing bottom roller gear A (10) are meshed with each other in pairs.

8. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The two transmission gears (11) are rotatably mounted between the traction roller gear (9) and the printing bottom roller gear A (10).

9. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, The ink cartridge (14) is located directly below the ink roller (4), and the shape and size of the ink cartridge (14) are adapted to the ink roller (4).

10. The intermittent dimension roller device for letterpress printing according to claim 1, characterized in that, An auxiliary traction roller (22) is positioned directly above the main traction roller (5), and the printed film (18) passes between the main traction roller (5) and the auxiliary traction roller (22).

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