Low-blind-pass shallow-screen gravure printing roller

Abstract

The utility model relates to the technical field of printing rollers, and discloses a low blind pass shallow screen printing plate intaglio printing roller, which comprises a main shaft, a roller and a positioning assembly, the roller is sleeved on the main shaft, a plurality of annularly distributed dovetail grooves are arranged on the circumference of the main shaft, a plurality of annularly distributed dovetail strips are arranged on the inner circumference of the roller, and the dovetail grooves are matched with the dovetail strips. A cavity is formed in one end of the main shaft, the positioning assembly is arranged in the cavity, a positioning groove is formed in the end, close to the positioning assembly, of the dovetail strip, the positioning assembly comprises a driving assembly, a connecting shaft, a rotating wheel, a connecting rod and a positioning block, the driving assembly is installed at one end of the connecting shaft, the connecting shaft is rotatably installed in the cavity, and the rotating wheel is installed in the positioning block. The rotating wheel is fixedly connected to the other end of the connecting shaft, the connecting rod is hinged between the rotating wheel and the positioning block, and the positioning block penetrates into the dovetail groove in a sliding mode. Through the arrangement of the positioning assembly, the roller can be taken down from the main shaft, the roller can be independently replaced, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of printing rollers, in particular to a low-dark-channel shallow-screen gravure printing roller. Background Art

[0002] Compared with relief printing and lithography, the carrier for gravure printing to store and transfer ink is the cell. Since the ink volume of the cell can be different, the amount of ink transferred is also different. Therefore, the printed products of gravure printing have the characteristics of thick ink layer, bright colors, clear and rich layers and strong sense of reality, and occupy an increasingly important position in packaging printing. The quality of the printed product has a lot to do with the ink transfer. For cells with a relatively shallow depth, the transferred ink dots are reduced. For example, the dots with a cell depth of 14μm are reduced, especially in the bright tone part, indicating that the gravure printing high light tone transfer is poor. The reason is that the cell is shallow, and the corresponding cell depth and opening area are relatively small. The ink at the bottom of the conical cell of the engraved gravure is difficult to transfer, especially the middle part of the ink contained in the cell. When the ink is transferred, the middle part is in instant contact with the printing material, which is not as sufficient as the surrounding contact. Therefore, the ink dots transferred from the cells with a relatively shallow depth appear to be reduced.

[0003] The existing Chinese patent with the announcement number CN205767971U discloses a gravure printing roller, including a roller body and a main shaft extending from both ends of the roller body, the main shaft and the roller body are integrally formed, and a plurality of cells are arranged on the outer peripheral surface of the roller body, and the cross-sectional shape of each cell in the radial direction of the main shaft is a trumpet-shaped cell with a larger top and a smaller bottom. Improvements are made on the basis of the cells of the original printing roller, the opening area is enlarged, and the ink capacity of the cells is increased to a certain extent. Moreover, due to the enlarged opening, the capillary suction between the printing plate and the substrate is also increased, thereby increasing the amount of ink transferred.

[0004] With respect to the above-mentioned related technologies, the inventors have found that there are at least the following problems in the technology: the mesh holes are generally arranged on the surface of the roller, and the roller and the main shaft of the existing printing roller are an integrated structure. When replacing a printing roller with different mesh holes, the entire printing roller needs to be replaced, and the roller cannot be replaced individually, resulting in high cost of use.

[0005] Therefore, how to design a low dark channel shallow screen gravure printing roller has become a problem that we currently need to solve. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the utility model provides a low-dark-channel shallow-screen gravure printing roller to solve the problems mentioned in the above-mentioned background technology.

[0008] (II) Technical solution

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a low dark channel shallow screen gravure printing roller, comprising a main shaft, a roller and a positioning assembly, the roller is sleeved on the main shaft, a plurality of dovetail grooves distributed in an annular manner are provided on the circumference of the main shaft, a plurality of dovetail strips distributed in an annular manner are provided on the inner circumference of the roller, a cavity is provided at one end of the main shaft, the positioning assembly is arranged in the cavity, and a positioning groove is provided at one end of the dovetail strip close to the positioning assembly;

[0010] The positioning assembly includes a driving assembly, a connecting shaft, a rotating wheel, a connecting rod and a positioning block. The driving assembly is installed at one end of the connecting shaft, the connecting shaft is rotatably installed in the cavity, the rotating wheel is fixedly connected to the other end of the connecting shaft, the connecting rod is hinged between the rotating wheel and the positioning block, and the positioning block slides through the dovetail groove.

[0011] Preferably, a limiting portion is provided at one end of the roller away from the positioning assembly.

[0012] Preferably, the driving assembly comprises a knob, a worm and a worm wheel, the knob is fixedly connected to one end of the worm, the worm is rotatably installed in the cavity, and the worm wheel is fixedly sleeved on the connecting shaft and meshes with the worm.

[0013] Preferably, a groove is provided on the surface of the main shaft, and the knob is located in the groove.

[0014] Preferably, a cover plate for covering the groove is hinged on the surface of the main shaft, and the cover plate is clamped in the groove.

[0015] Preferably, an arc-shaped limiting groove is opened on one side of the rotating wheel, a limiting rod is slidably connected in the arc-shaped limiting groove, and the limiting rod is fixedly connected in the cavity.

[0016] (III) Beneficial effects

[0017] The utility model provides a low dark channel shallow screen gravure printing roller, which has the following beneficial effects:

[0018] First, by setting a positioning component, after the roller is completely sleeved on the main shaft, the driving component can be used to rotate the connecting shaft, so that the connecting shaft drives the rotating wheel to rotate, and the rotating wheel drives the positioning block to be inserted into the positioning groove through the connecting rod, so as to position the dovetail bar and then fix the roller. When it is necessary to replace the roller with different mesh holes, the driving component can be used to rotate the connecting shaft in the opposite direction to move the positioning block out of the positioning groove, so that the roller can be slid, the roller can be removed from the main shaft, and the roller can be replaced separately, thereby reducing the use cost.

[0019] Second: by setting up a driving component, during operation, the knob can be rotated to drive the worm to rotate, so that the worm drives the worm wheel to rotate, and the worm wheel drives the connecting shaft to rotate. Since the worm and worm wheel structure has self-locking properties, unintentional rotation of the connecting shaft can be avoided, thereby ensuring the safety of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0022] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0023] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model.

[0024] In the figure: 1. main shaft; 11. dovetail groove; 12. groove; 13. cover plate; 2. roller; 21. dovetail strip; 22. positioning groove; 23. limit part; 3. positioning assembly; 31. drive assembly; 311. knob; 312. worm; 313. worm wheel; 32. connecting shaft; 33. rotating wheel; 34. connecting rod; 35. positioning block; 36. arc-shaped limit groove; 37. limit rod. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] like Figure 1-4 As shown, the utility model provides a technical solution: a low-dark-channel shallow-screen gravure printing roller, comprising a main shaft 1, a roller 2 and a positioning assembly 3, the roller 2 is sleeved on the main shaft 1, and the surface of the roller 2 is provided with low-dark-channel shallow-screen holes for printing, a plurality of annular dovetail grooves 11 are provided on the circumference of the main shaft 1, and a plurality of annular dovetail strips 21 are provided on the inner circumference of the roller 2, through the cooperation of the dovetail grooves 11 and the dovetail strips 21, the roller 2 can be slidably sleeved on the main shaft 1 along one end of the main shaft 1, and the roller 2 can be limited, the main shaft 1 can drive the roller 2 to rotate, a cavity is provided at one end of the main shaft 1, the positioning assembly 3 is arranged in the cavity, and a limiting portion 23 is provided at one end of the roller 2 away from the positioning assembly 3, and the end of the roller 2 can be limited by the limiting portion 23.

[0029] Reference Figure 3 and Figure 4 The positioning assembly 3 includes a driving assembly 31, a connecting shaft 32, a rotating wheel 33, a connecting rod 34 and a positioning block 35. The driving assembly 31 is installed at one end of the connecting shaft 32, the connecting shaft 32 is rotatably installed in the cavity, the rotating wheel 33 is fixedly connected to the other end of the connecting shaft 32, the connecting rod 34 is hinged between the rotating wheel 33 and the positioning block 35, the positioning block 35 slides through the dovetail groove 11, and a positioning groove 22 is opened at one end of the dovetail bar 21 close to the positioning assembly 3. By setting the positioning assembly 3, after the roller 2 is completely sleeved on the main shaft 1, it can The driving assembly 31 is used to rotate the connecting shaft 32, so that the connecting shaft 32 drives the rotating wheel 33 to rotate, and the rotating wheel 33 drives the positioning block 35 to be inserted into the positioning groove 22 through the connecting rod 34, so as to position the dovetail bar 21 and fix the roller 2. When it is necessary to replace the roller 2 with different mesh holes, the driving assembly 31 can be used to rotate the connecting shaft 32 in the opposite direction to move the positioning block 35 out of the positioning groove 22, so that the roller 2 can be slid, and the roller 2 can be removed from the main shaft 1, and the roller 2 can be replaced separately, thereby reducing the use cost.

[0030] Specifically, the driving assembly 31 includes a knob 311, a worm 312 and a worm wheel 313. The knob 311 is fixedly connected to one end of the worm 312, and the worm 312 is rotatably installed in the cavity. The worm wheel 313 is fixedly sleeved on the connecting shaft 32 and meshes with the worm 312. By setting the driving assembly 31, during operation, the knob 311 can be rotated to drive the worm 312 to rotate, so that the worm 312 drives the worm wheel 313 to rotate, and the worm wheel 313 drives the connecting shaft 32 to rotate. Since the structure of the worm 312 and the worm wheel 313 is self-locking, the non-human rotation of the connecting shaft 32 can be avoided, thereby ensuring the safety of the structure. A groove 12 is provided on the surface of the main shaft 1, and the knob 311 is located in the groove 12. A cover plate 13 for covering the groove 12 is hinged on the surface of the main shaft 1, and the cover plate 13 is clamped in the groove 12. By setting the groove 12 and the cover plate 13, the knob 311 can be stored and protected.

[0031] In order to limit the rotatable angle of the wheel 33, an arc-shaped limit groove 36 is opened on one side of the wheel 33, and a limit rod 37 is slidably connected in the arc-shaped limit groove 36. The limit rod 37 is fixedly connected in the cavity. When the wheel 33 rotates, the limit rod 37 will slide in the arc-shaped limit groove 36 to limit the rotatable angle of the wheel 33 and prevent the wheel 33 from excessive rotation.

[0032] The working process of the utility model is as follows: the roller 2 can be slidably sleeved on the main shaft 1 along one end of the main shaft 1, and the dovetail strip 21 slides along the dovetail groove 11 to limit the roller 2. After the roller 2 is completely sleeved on the main shaft 1, the knob 311 can be rotated to drive the worm 312 to rotate, so that the worm 312 drives the worm wheel 313 to rotate, so that the worm wheel 313 drives the connecting shaft 32 to rotate, so that the connecting shaft 32 drives the rotating wheel 33 to rotate, and the rotating wheel 33 drives the positioning block 35 to be inserted into the positioning groove 22 through the connecting rod 34, so as to position the dovetail strip 21 and then fix the roller 2. When it is necessary to replace the roller 2 with different mesh holes, the driving assembly 31 can be used to rotate the connecting shaft 32 in the opposite direction to move the positioning block 35 out of the positioning groove 22, so as to slide the roller 2, remove the roller 2 from the main shaft 1, and replace the roller 2 separately, thereby reducing the use cost.

[0033] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-dark-channel shallow halftone gravure printing roller, comprising a main shaft (1), a roller (2) and a positioning assembly (3), characterized in that: The roller (2) is sleeved on the main shaft (1), a plurality of dovetail grooves (11) distributed in an annular manner are provided on the circumference of the main shaft (1), a plurality of dovetail strips (21) distributed in an annular manner are provided on the inner circumference of the roller (2), a cavity is provided at one end of the main shaft (1), the positioning assembly (3) is arranged in the cavity, and a positioning groove (22) is provided at one end of the dovetail strip (21) close to the positioning assembly (3); The positioning assembly (3) comprises a driving assembly (31), a connecting shaft (32), a rotating wheel (33), a connecting rod (34) and a positioning block (35); the driving assembly (31) is mounted on one end of the connecting shaft (32); the connecting shaft (32) is rotatably mounted in a cavity; the rotating wheel (33) is fixedly connected to the other end of the connecting shaft (32); the connecting rod (34) is hinged between the rotating wheel (33) and the positioning block (35); and the positioning block (35) slides through the dovetail groove (11).

2. A low dark channel shallow halftone gravure printing roller according to claim 1, characterized in that: A limiting portion (23) is provided at one end of the roller (2) away from the positioning assembly (3).

3. The low dark channel shallow halftone gravure printing roller according to claim 1, characterized in that: The driving assembly (31) comprises a knob (311), a worm (312) and a worm wheel (313); the knob (311) is fixedly connected to one end of the worm (312); the worm (312) is rotatably mounted in the cavity; and the worm wheel (313) is fixedly sleeved on the connecting shaft (32) and meshes with the worm (312).

4. A low dark channel shallow halftone gravure printing roller according to claim 3, characterized in that: A groove (12) is provided on the surface of the main shaft (1), and the knob (311) is located in the groove (12).

5. A low dark channel shallow halftone gravure printing roller according to claim 4, characterized in that: A cover plate (13) for covering the groove (12) is hingedly connected to the surface of the main shaft (1), and the cover plate (13) is clamped in the groove (12).

6. The low dark channel shallow halftone gravure printing roller according to claim 1, characterized in that: An arc-shaped limiting groove (36) is provided on one side of the rotating wheel (33), a limiting rod (37) is slidably connected in the arc-shaped limiting groove (36), and the limiting rod (37) is fixedly connected in the cavity.

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