A plate cylinder device for a gravure printing press

Abstract

The utility model relates to printing equipment technical field especially relates to a version roller device of gravure press. Including the roll axle, the printing roller of setting in the roll axle on and being located between the clamping jaw of roll axle and printing roller, clamping jaw has a plurality of radial contraction contraction block, still include a locking sleeve for driving the clamping jaw moves along the roll axle axial movement, the outer periphery of contraction block is equipped with the first taper surface, and the inner periphery of printing roller is equipped with the first mating surface with the first taper surface cooperation, the inner periphery of contraction block is equipped with the second taper surface, and the outer periphery of roll axle is equipped with the second mating surface with second taper surface cooperation, when locking sleeve drives the clamping jaw axial movement, the first taper surface and the first mating surface cooperation, to drive contraction block radial contraction, and then make second taper surface and second mating surface fit. The utility model can realize the connection of stable, reliable and easily assembled between version roller and roll axle, improve the stable degree of connection and the concentricity of version roller.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment technology, and in particular to a printing roller device for a gravure printing machine. Background Technology

[0002] As an important printing equipment, the performance of the printing roller assembly in a gravure printing press directly affects print quality and production efficiency. During gravure printing, the stability and concentricity of the printing rollers are crucial; even minor deviations can lead to problems such as blurred images and misregistration. Therefore, achieving a stable, reliable, and easy-to-assemble connection between the printing rollers and the roller shaft has always been a key focus for technicians in this field.

[0003] Currently, there is a printing roller device in the prior art, such as the technical solution disclosed in Chinese Patent Application Publication No. CN117382298A. This solution proposes a method for fixing the printing roller on the roller shaft using elastic unit claws. Specifically, the top sleeve end of the device is divided into several deformable elastic unit claws. The inner ring of these elastic unit claws is provided with a deformation-avoiding annular groove, allowing them to bend and contract inward. When the top sleeve axially presses against the cylinder, the elastic unit claws bend and contract inward and clamp the roller shaft, thereby fixing the cylinder to the roller shaft. This design aims to achieve a fixed assembly of the cylinder on the roller shaft, while also taking into account the convenience of disassembly and assembly, as well as the adjustment of the center line.

[0004] However, the aforementioned existing technical solutions have certain limitations in practical applications. Because the inner circumferential surface of the elastic unit claw is designed to contact the roller shaft, a certain gap must be reserved between the inner circumferential surface of the elastic unit claw and the outer circumferential surface of the roller shaft to facilitate the assembly of the top sleeve and the roller shaft. When the elastic unit claw bends inward to tighten around the roller shaft, the end of its inner circumferential surface furthest from the deformation-avoiding annular groove will first contact the outer circumferential surface of the roller shaft. However, when the top sleeve is fully locked, the portion of the inner circumferential surface of the elastic unit claw near the deformation-avoiding annular groove cannot fully contact the outer circumferential surface of the roller shaft. This results in a small actual contact area between the elastic unit claw and the roller shaft, leading to an insufficiently tight connection and significantly reducing the stability of the connection between the elastic unit claw and the roller shaft. This unstable connection may displace during printing due to vibration or force, thus affecting the concentricity of the printing roller and ultimately adversely affecting printing quality. Therefore, the existing technology urgently needs improvement to address these problems. Utility Model Content

[0005] This application provides a printing roller device for a gravure printing machine, which can improve the technical problems existing in related technologies, such as unstable connection between the printing roller and the roller shaft, easy to affect concentricity, and thus affect printing quality.

[0006] A printing roller assembly for a gravure printing machine includes a roller shaft, a printing roller sleeved on the roller shaft, and a gripper disposed between the roller shaft and the printing roller. The gripper has a plurality of radially retractable shrink blocks. It also includes a locking sleeve for driving the gripper to move axially along the roller shaft. The outer peripheral surface of each shrink block has a first conical surface, and the inner peripheral surface of the printing roller has a first mating surface that engages with the first conical surface. The inner peripheral surface of each shrink block has a second conical surface, and the outer peripheral surface of the roller shaft has a second mating surface that engages with the second conical surface. When the locking sleeve drives the gripper to move axially, the first conical surface engages with the first mating surface to drive the shrink block to retract radially, thereby causing the second conical surface to fit against the second mating surface.

[0007] This technical solution enables a stable, reliable, and easy-to-assemble connection between the printing roller and the roller shaft, significantly improving the stability of the connection and the concentricity of the printing roller.

[0008] Furthermore, the printing roller assembly of the gravure printing machine also includes a check valve assembly for preventing the locking sleeve from reversing; the check valve assembly includes a check valve sleeve fitted on the roller shaft and a spring disposed between the check valve sleeve and the roller shaft; a second step is formed at the end of the locking sleeve away from the gripper, and the second step is fitted onto the check valve sleeve; the outer circumferential surface of the roller shaft is provided with a first step opposite to the second step; a plurality of first locking teeth are provided at the end of the check valve sleeve near the first step, and a plurality of second locking teeth are provided on the first step to engage with the first locking teeth; the spring drives the check valve sleeve to move so that the first locking teeth engage with the second locking teeth.

[0009] More specifically, in some implementations, the outer circumferential surface of the check sleeve is provided with a guide strip, and the inner circumferential surface of the locking sleeve is provided with a guide groove that cooperates with the guide strip; when the locking sleeve rotates, the check sleeve is driven to rotate synchronously through the cooperation of the guide groove and the guide strip.

[0010] Preferably, the end of the first locking tooth that is opposite in position to the second locking tooth has an arc surface.

[0011] Furthermore, the printing roller assembly of the gravure printing machine also includes a pressure bearing; the pressure bearing is sleeved on the roller shaft and located between the locking sleeve and the gripper.

[0012] Preferably, the inner circumferential surface of the locking sleeve is threadedly connected to the outer circumferential surface of the roller.

[0013] This technical solution provides a reliable and adjustable locking method, facilitating precise control of the axial movement of the gripper.

[0014] More specifically, in some implementations, the second conical surface is provided with a second limiting pin, and the second mating surface is provided with a second limiting groove that mates with the second limiting pin.

[0015] Preferably, one end of the gripper is provided with a plurality of dividing grooves to divide the end into a plurality of contraction blocks; the inner circumferential surface of the gripper is provided with an annular contraction groove at the root of the contraction block.

[0016] Furthermore, the outer peripheral surface of the roller shaft away from the gripper is provided with a third conical surface, and the inner peripheral surface of the printing roller away from the gripper is provided with a third mating surface that mates with the third conical surface.

[0017] Preferably, the third conical surface is provided with a first limiting pin, and the third mating surface is provided with a first limiting groove that mates with the first limiting pin. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the printing roller device of a gravure printing machine provided in an embodiment of this application.

[0019] Figure 2 This is a schematic diagram of the overall structure of the roller provided in an embodiment of this application.

[0020] Figure 3 This is a magnified view of part A in image 2.

[0021] Figure 4 A cross-sectional view of a printing roller assembly of a gravure printing machine provided in an embodiment of this application. Figure 1 .

[0022] Figure 5 This is a magnified view of part B in image 4.

[0023] Figure 6 A cross-sectional view of a printing roller assembly of a gravure printing machine provided in an embodiment of this application. Figure 2 .

[0024] Figure 7 This is a schematic diagram of the overall structure of the locking sleeve provided in an embodiment of this application.

[0025] Figure 8 This is a schematic diagram of the overall structure of the gripper provided in an embodiment of this application.

[0026] The following are the labeling elements in the figure:

[0027] 1. Roller shaft; 11. Second mating surface; 12. Third conical surface; 13. First limiting pin; 14. First step; 15. Second limiting groove; 2. Printing roller; 21. First mating surface; 22. Third mating surface; 23. First limiting groove; 3. Gripper; 31. Separating groove; 32. Shrinkage groove; 33. Shrinkage block; 331. First conical surface; 332. Second conical surface; 333. Second limiting pin; 4. Locking sleeve; 41. Guide groove; 42. Second step; 5. Pressure bearing; 6. Check valve assembly; 61. Check valve sleeve; 611. Abutment part; 612. Guide bar; 62. First locking tooth; 63. Second locking tooth; 64. Spring. Detailed Implementation

[0028] Existing technical solutions have certain limitations in practical applications. Because the inner circumferential surface of the elastic unit claw is designed to contact the roller shaft, a certain gap must be maintained between the inner circumferential surface of the elastic unit claw and the outer circumferential surface of the roller shaft to facilitate the assembly of the top sleeve and the roller shaft. When the elastic unit claw bends inward to tighten around the roller shaft, the end of its inner circumferential surface furthest from the deformation-avoiding annular groove will first contact the outer circumferential surface of the roller shaft. However, when the top sleeve is fully locked, the portion of the inner circumferential surface of the elastic unit claw near the deformation-avoiding annular groove cannot fully contact the outer circumferential surface of the roller shaft. This results in a small actual contact area between the elastic unit claw and the roller shaft, leading to an insufficiently tight connection and significantly reducing the stability of the connection. This unstable connection may cause displacement during printing due to vibration or force, affecting the concentricity of the printing roller and ultimately adversely impacting printing quality. Therefore, existing technologies urgently need improvement to address these issues.

[0029] Based on this, in order to improve the problems of unstable connection between the printing roller and the roller shaft and easy to affect the concentricity in the related technology, which in turn affects the printing quality, the embodiments of this application provide the following solutions.

[0030] The following combination Figures 1-8 This application will be described in further detail.

[0031] See Figures 1 to 8 The printing roller device of the gravure printing machine disclosed in this embodiment includes a roller shaft 1, a printing roller 2 sleeved on the roller shaft 1, and a gripper 3 disposed between the roller shaft 1 and the printing roller 2. The gripper 3 has a plurality of radially retractable shrink blocks 33.

[0032] It also includes a locking sleeve 4 for driving the gripper 3 to move axially along the roller shaft 1. The axial movement of the locking sleeve controls the contraction or expansion state of the gripper 3. The locking sleeve 4 is usually connected to the roller shaft 1 or the gripper 3 by a threaded connection or other mechanical transmission method, and can apply an axial thrust to the gripper 3 when it rotates or moves axially.

[0033] The outer peripheral surface of the shrink block 33 is provided with a first conical surface 331, and the inner peripheral surface of the printing roller 2 is provided with a first mating surface 21 that mates with the first conical surface 331. At the same time, the inner peripheral surface of the shrink block 33 is provided with a second conical surface 332, and the outer peripheral surface of the roller shaft 1 is provided with a second mating surface 11 that mates with the second conical surface 332.

[0034] In practical use, the working principle and fixing process of the gravure printing press roller device in this embodiment are as follows:

[0035] First, the printing roller 2 is fitted onto the roller shaft 1, and the gripper 3 is positioned between the roller shaft 1 and the printing roller 2. At this time, the contraction block 33 of the gripper 3 is in a relatively relaxed state, allowing the printing roller 2 to be initially positioned relatively freely on the roller shaft 1.

[0036] Next, the locking sleeve 4 is moved axially along the roller shaft 1 by operation. For example, if the locking sleeve 4 is threaded to the roller shaft 1, its axial movement can be driven by rotating the locking sleeve 4. The axial movement of the locking sleeve 4 directly acts on the gripper 3, applying an axial thrust to it.

[0037] When the locking sleeve 4 drives the gripper 3 to move axially along the roller shaft 1, the first conical surface 331 on the outer circumferential surface of the shrinkage block 33 on the gripper 3 gradually contacts and engages with the first mating surface 21 on the inner circumferential surface of the printing roller 2. Due to the slope of the conical surface, this axial thrust is converted into radial compressive force, causing the shrinkage block 33 to shrink radially. This radial shrinkage is a key step in achieving a tight grip.

[0038] Furthermore, as the shrink block 33 contracts radially, the second conical surface 332 on its inner circumferential surface will further contact the second mating surface 11 on the outer circumferential surface of the roller 1. Due to the continuous radial contraction of the shrink block 33, the second conical surface 332 will fit tightly against the second mating surface 11. This double-conical surface mating design allows the shrink block 33 to actively and tightly grip the roller 1 while being squeezed and contracted by the conical surface of the printing roller 2, forming a stable self-locking structure.

[0039] In existing technologies, there is a gap between the inner circumferential surface of the elastic unit claw and the roller shaft, and some areas may not be able to make sufficient contact after shrinkage, resulting in a small contact area and reduced connection stability. This embodiment introduces a double-conical surface mating mechanism, where the first conical surface 331 on the shrink block 33 mates with the first mating surface 21 on the printing roller 2, and the second conical surface 332 on the shrink block 33 mates with the second mating surface 11 on the roller shaft 1, effectively converting axial force into radial clamping force. This design ensures that the claw 3 and the roller shaft 1 can achieve a larger area of ​​close contact in the locked state, and provides a stronger radial clamping force through the wedge effect between the conical surfaces. Therefore, this device can effectively avoid the connection instability problem caused by insufficient contact area in traditional solutions, significantly improving the connection strength and concentricity between the printing roller and the roller shaft, thereby maintaining higher stability and printing quality during high-speed printing.

[0040] Please see Figure 4 and Figure 5 This application further proposes a check valve assembly 6 for preventing the locking sleeve 4 from reversing. The check valve assembly 6 specifically includes a check valve sleeve 61 sleeved on the roller shaft 1, and a spring 64 disposed between the check valve sleeve 61 and the roller shaft 1. The check valve sleeve 61 is configured to move axially along the roller shaft 1 and form a linkage with the locking sleeve 4. A second step 42 is formed at the end of the locking sleeve 4 away from the gripper 3. This second step 42 is sleeved on the check valve sleeve 61, allowing rotation or axial movement of the locking sleeve 4 to be transmitted to the check valve sleeve 61 via the second step 42. Simultaneously, a first step 14 is provided on the outer circumferential surface of the roller shaft 1, opposite to the second step 42, providing a fixed mating surface for the check valve assembly 6. A plurality of first locking teeth 62 are provided at the end of the check valve sleeve 61 near the first step 14, while a plurality of second locking teeth 63 are provided on the first step 14 to engage with the first locking teeth 62. These locking teeth are designed to mesh with each other under specific conditions, thereby achieving the check valve function. Spring 64 is configured to drive check sleeve 61 to move axially to cause first locking tooth 62 to engage with second locking tooth 63.

[0041] The solution proposed in this application effectively solves the problem of the locking sleeve 4 potentially rotating in reverse or loosening by introducing a check valve assembly 6. Specifically, after the locking sleeve 4 is tightened to drive the gripper 3 to move axially and lock the printing roller 2, the preload of the spring 64 continues to act on the check valve 61, driving it to move axially along the roller shaft 1. This causes the first locking tooth 62 on the check valve 61 to mesh with the second locking tooth 63 on the first step 14 of the roller shaft 1. The meshing of the first locking tooth 62 and the second locking tooth 63 forms a mechanical locking structure, preventing the locking sleeve 4 from rotating in the locked state. Even if the printing roller assembly is subjected to vibration or impact during printing, this meshing structure provides stable support, preventing the locking sleeve 4 from loosening due to external factors.

[0042] Please see Figures 4 to 7 In some preferred embodiments, the outer peripheral surface of the check sleeve 61 is provided with a guide strip 612, and the inner peripheral surface of the locking sleeve 4 is provided with a guide groove 41 that cooperates with the guide strip 612.

[0043] When a rotational torque is applied to the locking sleeve 4, the tight fit between the guide groove 41 and the guide bar 612 forces the check sleeve 61 to rotate synchronously. Due to this synchronous rotation mechanism, the angular position of the check sleeve 61 remains consistent with that of the locking sleeve 4, preventing relative rotation between them. This ensures that the first locking tooth 62 in the check assembly 6 and the second locking tooth 63 on the roller 1 maintain the correct relative alignment during the rotation of the locking sleeve 4.

[0044] Please see Figure 3 and Figure 7 The first locking tooth 62 and the second locking tooth 63 are respectively provided with an arc surface at their opposite ends. This structural design can effectively guide the meshing of the first locking tooth 62 and the second locking tooth 63, thereby improving the reliability and stability of the locking mechanism.

[0045] The arc surface is located on the side where the first locking tooth 62 and the second locking tooth 63 are opposite to each other. When the locking sleeve is turned in the forward direction, the second step pushes the spring, and the spring is compressed so that the first limiting tooth and the second limiting tooth are tightly attached. When the first locking tooth rotates, it will insert between the two second locking teeth. Then the first locking tooth and the second locking tooth will contact each other through the arc surface. The second locking tooth will push the first locking tooth away from the first step, thereby allowing the locking sleeve to rotate in one direction. When the locking sleeve has a tendency to reverse due to vibration or other reasons, the first locking tooth reverses and enters between the two second locking teeth. The second locking tooth and the first locking tooth will contact each other through the plane, thereby preventing the first locking tooth and the threaded sleeve from reversing.

[0046] Please see Figure 1 and Figure 4In the above embodiments of this application, a pressure bearing 5 is also included; the pressure bearing 5 is sleeved on the roller 1 and disposed between the locking sleeve 4 and the gripper 3.

[0047] The pressure bearing 5 is a bearing that can withstand axial pressure. By adding the pressure bearing 5, the friction between the locking sleeve 4 and the gripper 3 can be effectively reduced, ensuring the smoothness of the axial movement of the gripper 3, thereby improving the printing accuracy.

[0048] Please see Figure 3 and Figure 4 The inner circumferential surface of the locking sleeve 4 is threadedly connected to the outer circumferential surface of the roller shaft 1. Specifically, an internal thread is provided on the inner circumferential surface of the locking sleeve 4, and an external thread that mates with the internal thread is provided on the outer circumferential surface of the roller shaft 1. By rotating the locking sleeve 4, the internal thread and the external thread can be engaged, thereby fixing the locking sleeve 4 to the roller shaft 1.

[0049] Please see Figure 3 and Figure 8 The second conical surface 332 is provided with a second limiting pin 333, and the second mating surface 11 is provided with a second limiting groove 15 that mates with the second limiting pin 333.

[0050] By setting a second limiting pin 333 on the second conical surface 332 and opening a second limiting groove 15 on the second mating surface 11, relative rotation between the gripper 3 and the roller shaft 1 can be effectively avoided, ensuring the positioning accuracy of the gripper 3 and improving the overall stability of the printing roller device. In actual use, when it is necessary to replace the printing roller 2, first loosen the locking sleeve 4 to allow the gripper 3 to release the printing roller 2, then remove the old printing roller 2 and replace it with the new printing roller 2. When installing the new printing roller 2, it is necessary to ensure that the second limiting pin 333 is aligned with the second limiting groove 15. This ensures that the gripper 3 can accurately clamp the printing roller 2 and avoids misalignment or deviation of the printing roller 2 due to the rotation of the gripper 3.

[0051] Please see Figure 8 Multiple dividing grooves 31 are provided at one end of the gripper 3 to divide the end into multiple shrink blocks 33; annular shrink grooves 32 are provided on the inner circumferential surface of the gripper 3 at the root of the shrink blocks 33.

[0052] The dividing groove 31 refers to multiple grooves axially formed at one end of the gripper 3, which divide the end of the gripper 3 into multiple independent shrinkage blocks 33, allowing each shrinkage block 33 to shrink radially independently. The shrinkage groove 32 refers to an annular groove formed on the inner circumferential surface of the gripper 3 at the root of the shrinkage block 33. The shrinkage groove 32 reduces the accumulation of material at the root of the shrinkage block 33, making it easier for the shrinkage block 33 to deform under external force, thereby achieving radial shrinkage of the gripper 3.

[0053] Specifically, when the locking sleeve 4 drives the gripper 3 to move axially, the first conical surface 331 engages with the first mating surface 21, causing the shrinkage block 33 to shrink radially. Each shrinkage block 33 can shrink radially independently, thus avoiding stress concentration that may be caused by overall deformation. At the same time, the shrinkage groove 32 makes it easier for the root of the shrinkage block 33 to deform, further reducing the force required for shrinkage and making the shrinkage process of the gripper 3 more stable and reliable.

[0054] By setting the partition groove 31 and the shrinkage groove 32, the deformation of the shrinkage block 33 can be made easier, making the overall structure of the gripper 3 more stable and reliable.

[0055] Please see Figure 2 and Figure 6 A third conical surface 12 is provided at the end of the roller 1 away from the gripper 3, and a third mating surface 22 that mates with the third conical surface 12 is provided on the inner circumferential surface of the printing roller 2 at the end away from the gripper 3.

[0056] The third conical surface 12 refers to the inclined surface located at the end of the roller shaft 1. Its main function is to form a tight fit with the third mating surface 22 of the printing roller 2, thereby ensuring the precise positioning of the printing roller 2 in the axial and radial directions. The third mating surface 22 refers to the inclined surface on the inner circumference of the printing roller 2 corresponding to the third conical surface 12. Its fit with the third conical surface 12 can effectively transmit torque and axial force, improving the overall stability of the printing roller 2.

[0057] By using a conical surface fit, the positioning accuracy and connection strength between the printing roller 2 and the roller shaft 1 can be improved.

[0058] Please see Figure 2 and Figure 6 A first limiting pin 13 is provided on the third conical surface 12, and a first limiting groove 23 is formed on the third mating surface 22 to mate with the first limiting pin 13. The first limiting pin 13 can be in various forms such as a cylindrical pin or a conical pin. Its function is to prevent the printing roller 2 from rotating when the third conical surface 12 mates with the third mating surface 22, ensuring the accurate installation position of the printing roller 2. The shape and size of the first limiting groove 23 match the first limiting pin 13, and it is used to accommodate the first limiting pin 13 and restrict the rotation of the printing roller 2.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A printing roller device for a gravure printing machine, comprising a roller shaft (1), a printing roller (2) sleeved on the roller shaft (1), and a gripper (3) disposed between the roller shaft (1) and the printing roller (2); The gripper (3) has a plurality of radially retractable contraction blocks (33); It also includes a locking sleeve (4) for driving the gripper (3) to move axially along the roller shaft (1); Its features are: The outer peripheral surface of the shrink block (33) is provided with a first conical surface (331), and the inner peripheral surface of the printing roller (2) is provided with a first mating surface (21) that mates with the first conical surface (331); The inner circumferential surface of the shrink block (33) is provided with a second conical surface (332), and the outer circumferential surface of the roller (1) is provided with a second mating surface (11) that mates with the second conical surface (332); When the locking sleeve (4) drives the gripper (3) to move axially, the first conical surface (331) engages with the first mating surface (21) to drive the shrinking block (33) to shrink radially, thereby causing the second conical surface (332) to fit with the second mating surface (11).

2. The printing roller device of the gravure printing machine according to claim 1, characterized in that, It also includes a check valve assembly (6) for preventing the locking sleeve (4) from reversing; the check valve assembly (6) includes a check valve sleeve (61) sleeved on the roller shaft (1) and a spring (64) disposed between the check valve sleeve (61) and the roller shaft (1); a second step (42) is formed at the end of the locking sleeve (4) away from the gripper (3), and the second step (42) is sleeved on the check valve sleeve (61); the outer circumferential surface of the roller shaft (1) is provided with a first step (14) opposite to the second step (42); a plurality of first locking teeth (62) are provided at the end of the check valve sleeve (61) near the first step (14), and a plurality of second locking teeth (63) are provided on the first step (14) to cooperate with the first locking teeth (62); the spring (64) drives the check valve sleeve (61) to move so that the first locking teeth (62) engage with the second locking teeth (63).

3. The printing roller device of the gravure printing machine according to claim 2, characterized in that, The outer circumferential surface of the check sleeve (61) is provided with a guide strip (612), and the inner circumferential surface of the locking sleeve (4) is provided with a guide groove (41) that cooperates with the guide strip (612); when the locking sleeve (4) rotates, the check sleeve (61) is driven to rotate synchronously through the cooperation of the guide groove (41) and the guide strip (612).

4. The printing roller device of the gravure printing machine according to claim 2, characterized in that, The first locking tooth (62) has an arc surface at the end opposite to the second locking tooth (63).

5. The printing roller device of the gravure printing machine according to claim 1, characterized in that, It also includes a pressure bearing (5); the pressure bearing (5) is sleeved on the roller (1) and located between the locking sleeve (4) and the gripper (3).

6. The printing roller device of the gravure printing machine according to claim 1, characterized in that, The inner circumferential surface of the locking sleeve (4) is threadedly connected to the outer circumferential surface of the roller (1).

7. The printing roller device of the gravure printing machine according to claim 1, characterized in that, The second conical surface (332) is provided with a second limiting pin (333), and the second mating surface (11) is provided with a second limiting groove (15) that mates with the second limiting pin (333).

8. The printing roller device of the gravure printing machine according to claim 1, characterized in that, One end of the gripper (3) is provided with a plurality of partition grooves (31) to divide the end into a plurality of contraction blocks (33); the inner circumferential surface of the gripper (3) is provided with an annular contraction groove (32) at the root of the contraction block (33).

9. The printing roller device of the gravure printing machine according to claim 1, characterized in that, The outer peripheral surface of the roller (1) away from the gripper (3) is provided with a third conical surface (12), and the inner peripheral surface of the printing roller (2) away from the gripper (3) is provided with a third mating surface (22) that mates with the third conical surface (12).

10. The printing roller device of the gravure printing machine according to claim 9, characterized in that, The third conical surface (12) is provided with a first limiting pin (13), and the third mating surface (22) is provided with a first limiting groove (23) that mates with the first limiting pin (13).

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