A printing press roller

Abstract

This invention provides a printing press roller, comprising: a roller including a first roller, a second roller, and a third roller, the first roller and the third roller being respectively disposed at both ends of the second roller; a bearing passing through the first roller, the second roller, and the third roller; an adjusting component connected to one end of the bearing, enabling the bearing to move axially relative to the roller, such that the bearing engages with at least one of the first roller, the second roller, and the third roller; a bearing sleeve fitted over one end of the bearing, the bearing sleeve having an elastic element, the two ends of the elastic element respectively abutting against the bearing sleeve and the bearing; and a first driving member, the output end of which drives the bearing to rotate, thereby causing the bearing to drive at least one of the first roller, the second roller, and the third roller to rotate for printing. The printing press roller provided by this invention allows for an adjustable number of the first roller, the second roller, and the third roller driven by the bearing, thus enabling different printing lengths with different numbers of rollers, facilitating adaptation to various working conditions.

Description

Technical Field

[0001] This invention belongs to the field of printing press technology, and specifically relates to a printing press roller. Background Technology

[0002] A printing press is a machine for printing text and images. A rotary printing press is a type of existing printing press. It usually presses the paper down with the cylinder to print text. Existing printing presses can only print fixed sizes and are inconvenient to adjust. When only a small width of paper needs to be printed, some cylinders will run idle, increasing the ineffective wear of the cylinders and wasting paper. This needs to be improved. Summary of the Invention

[0003] This invention provides a printing press roller, comprising:

[0004] The roller includes a first roller, a second roller, and a third roller, wherein the first roller and the third roller are respectively disposed at both ends of the second roller;

[0005] A bearing, wherein the bearing passes through the first roller, the second roller and the third roller;

[0006] An adjustment assembly is connected to one end of the bearing and enables the bearing to move axially relative to the rollers, such that the bearing engages with at least one of the first roller, the second roller, and the third roller;

[0007] A bearing sleeve, wherein the bearing sleeve is fitted onto one end of the bearing, and the bearing sleeve is provided with an elastic element, the two ends of the elastic element respectively abutting against the bearing sleeve and the bearing;

[0008] A first driving member, the output end of which can drive the bearing to rotate, so that the bearing drives at least one of the first roller, the second roller and the third roller to rotate for printing.

[0009] In one embodiment, the bearing includes a first bearing and a second bearing that are slidably disposed relative to each other, and the elastic element includes a first elastic element and a second elastic element, wherein the first elastic element abuts against the first bearing and the second elastic element abuts against the second bearing;

[0010] The first bearing is provided with a first snap-fit ​​part and a second snap-fit ​​part. The first snap-fit ​​part is positioned inside the first roller, and the second snap-fit ​​part is positioned inside the second roller.

[0011] The second bearing is provided with a third locking part and a fourth locking part. The third locking part is positioned inside the second roller, and the fourth locking part is positioned inside the third roller.

[0012] The first bearing is axially movable relative to the roller to engage the first roller and / or the second roller; the second bearing is axially movable relative to the roller to engage the second roller and / or the third roller.

[0013] In one embodiment, the first roller has a first movable cavity, and the first movable cavity has a first engaging part at one end near the second roller, and the first snap-fit ​​part is disposed in the first movable cavity;

[0014] When the first bearing moves axially relative to the first roller, the first engaging part moves in the first movable cavity. The first engaging part can engage or disengage from the first engaging part, so that the first bearing can drive the first roller to rotate or disengage from the first roller to idle.

[0015] In one embodiment, the third roller has a second movable cavity, and a second engaging portion is provided at one end of the second movable cavity away from the second roller, and the fourth snap-fit ​​portion is disposed in the second movable cavity;

[0016] When the second bearing moves axially relative to the third roller, the fourth engaging part moves in the second movable cavity. The fourth engaging part can engage with or disengage from the second engaging part, so that the second bearing can drive the third roller to rotate or disengage from the third roller to idle.

[0017] In one embodiment, the second roller includes:

[0018] The outer cylinder has a third movable cavity inside, and a driven helical gear is provided inside the third movable cavity;

[0019] A first inner cylinder passes through the outer cylinder and is relatively close to the third roller. One end of the first inner cylinder includes a first driving helical gear. The first driving helical gear is disposed in the third movable cavity and meshes with the driven helical gear. The first inner cylinder includes a fourth movable cavity. The two ends of the fourth movable cavity are respectively provided with a third meshing part and a fourth meshing part. A second snap-fit ​​part is disposed in the fourth movable cavity. The first bearing moves axially so that the second snap-fit ​​part meshes with the third meshing part and the fourth meshing part respectively.

[0020] The second inner cylinder passes through the outer cylinder and is relatively close to the first roller. One end of the second inner cylinder includes a second driving helical gear. The second driving helical gear is disposed in the third movable cavity and meshes with the driven helical gear. The second inner cylinder includes a fifth movable cavity. The end of the fifth movable cavity near the driven helical gear is provided with a fifth meshing part. The third snap-fit ​​part is disposed in the fifth movable cavity. The second bearing can move axially to make the third snap-fit ​​part engage or disengage from the fifth meshing part.

[0021] In one embodiment, the adjustment assembly includes a second drive member and an adjustment member. The adjustment member is disposed at the output end of the second drive member, and the end of the adjustment member is provided with a protrusion. The protrusion abuts against the bearing, and the second drive member can drive the adjustment member to rotate.

[0022] Wherein, the protrusion abuts against the first bearing and moves axially against the elastic force of the first elastic member, such that the first snap-fit ​​part snaps against the first engagement part, the second snap-fit ​​part changes from snapping against the fourth engagement part to snapping against the third engagement part, the protrusion disengages from the first bearing, the first elastic member abuts against the first bearing and resets, the first snap-fit ​​part disengages from the first engagement part, and the second snap-fit ​​part changes from snapping against the third engagement part to snapping against the fourth engagement part;

[0023] The protrusion abuts against the second bearing and moves axially against the elastic force of the second elastic member, so that the third locking part engages with the fifth engaging part, the fourth locking part engages with the second engaging part, the protrusion disengages from the first bearing, the third locking part disengages from the fifth engaging part, and the fourth locking part disengages from the second engaging part.

[0024] In one embodiment, there are two driven helical gears, which are symmetrically arranged along the bearing and respectively mesh with different parts of the first driving helical gear and the second driving helical gear.

[0025] In one embodiment, the first roller, the second roller, and the third roller have the same length and width.

[0026] In one embodiment, the output end of the first drive member is provided with an output gear, which meshes with the first bearing and the second bearing.

[0027] In one embodiment, the printing press roller further includes a first support and a second support, which are respectively disposed at both ends of the bearing and are used to support the bearing.

[0028] The printing press roller provided by this invention has an adjustment component that can control the number of the first, second, and third rollers connected by the bearing. This further enables the bearing to drive the number of rollers when the first drive component drives the bearing to rotate. Different numbers of rollers result in different printing widths, thus allowing for adjustable printing widths to accommodate different paper widths. This provides good flexibility and has broad application prospects. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a printing press roller in one embodiment of the present invention;

[0030] Figure 2 for Figure 1 The diagram shows the structure of the first roller in the printing press.

[0031] Figure 3 for Figure 2 The first roller is shown as a cross-sectional view along point AA.

[0032] Figure 4 for Figure 1 The diagram shows the structure of the second roller in the printing press.

[0033] Figure 5 for Figure 4 The second roller is shown as a cross-sectional view along BB.

[0034] Figure 6 for Figure 1 The diagram shown below is a structural schematic of the second roller, omitting the outer cylinder.

[0035] Figure 7 for Figure 1 The diagram shows the structure of the third roller in the printing press.

[0036] Figure 8 for Figure 7 The third roller is shown as a cross-sectional view along the CC direction.

[0037] Figure 9 for Figure 1 A schematic diagram of the bearing section in the printing press roller is shown.

[0038] Figure 10 for Figure 9 The bearing section shown is a cross-sectional view along DD.

[0039] Figure 11 for Figure 9 A schematic diagram of the bearing section shown, omitting some structural elements.

[0040] Figure 12 for Figure 1 The diagram shows the structure of the adjusting assembly in the printing press roller.

[0041] Figure 13 for Figure 1 A schematic diagram of the printing press roller from another perspective;

[0042] Figure 14 for Figure 13 The image shows a cross-sectional view of the printing press roller along EE.

[0043] Explanation of reference numerals in the attached figures:

[0044] 100. Printing press roller; 10. Roller; 11. First roller; 111. First movable cavity; 112. First meshing part; 12. Second roller; 121. Outer cylinder; 122. Third movable cavity; 123. Driven helical gear; 124. First inner cylinder; 1241. First driving helical gear; 1242. Fourth movable cavity; 1243. Third meshing part; 1244. Fourth meshing part; 1251. Second driving helical gear; 1252. Fifth movable cavity; 1253. Fifth meshing part; 125. Second inner cylinder; 13. Third roller; 131. Second movable cavity; 132. Second meshing part; 20. Bearing; 21. First bearing; 211. First snap-fit ​​part; 212. Second snap-fit ​​part; 213. First gear part; 22. Second bearing; 221. Third snap-fit ​​part; 222. Fourth snap-fit ​​part; 223. Second gear part; 23. Bearing sleeve; 30. Adjustment assembly; 31. Second drive member; 32. Adjustment member; 321. Protrusion; 33. Adapter; 40. First drive member; 41. Output gear; 50. Elastic member; 51. First elastic member; 52. Second elastic member; 60. First bracket; 70. Second bracket. Detailed Implementation

[0045] 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that when a component is said to be "mounted on" another component, it can be directly mounted on the other component or may be interspersed with a component. When a component is said to be "set on" another component, it can be directly set on the other component or may be interspersed with a component. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or may be interspersed with a component.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] See Figures 1 to 14 This invention provides a printing press roller 100, including a roller 10, a bearing 20, an adjusting assembly 30, and a first driving member 40. The roller 10 includes a first roller 11, a second roller 12, and a third roller 13, which are arranged sequentially adjacent to each other. In this embodiment, the first roller 11, the second roller 12, and the third roller 13 have the same dimensions; it is understood that in other embodiments, the dimensions of each roller 10 may be different.

[0049] See Figure 2 , Figure 3 The first roller 11 has a first movable cavity 111, and a first engaging part 112 is provided at one end of the first movable cavity 111 near the second roller 12. See Figure 7 and Figure 8 The third roller 13 has a second movable cavity 131, and the end of the second movable cavity 131 away from the second roller 12 has a second meshing part 132.

[0050] See Figure 4 , Figure 5 and Figure 6 The second roller 12 includes an outer cylinder 121, which has a third movable cavity 122, and a driven helical gear 123 is provided in the third movable cavity 122. The second roller 12 also includes a first inner cylinder 124 and a second inner cylinder 125. The outer cylinder 121 is fitted with the first inner cylinder 124 and the second inner cylinder 125. The first inner cylinder 124 is close to the third roller 13. One end of the first inner cylinder 124 includes a first driving helical gear 1241. The first driving helical gear 1241 is located in the third movable cavity 122 and meshes with the driven helical gear 123. The first inner cylinder 124 has a fourth movable cavity 1242. The two ends of the fourth movable cavity 1242 are respectively provided with a third meshing part 1243 and a fourth meshing part 1244. The end of the second inner cylinder 125 close to the first inner cylinder 124 includes a second driving helical gear 1251. The second driving helical gear 1251 is located in the third movable cavity 122 and meshes with the driven helical gear 123. The second inner cylinder 125 has a fifth movable cavity 1252. The end of the fifth movable cavity 1252 close to the driven helical gear 123 is provided with a fifth meshing part 1253.

[0051] See Figure 9 , Figure 10 and Figure 11The bearing 20 is disposed in the first roller 11, the second roller 12 and the third roller 13. The bearing 20 includes a first bearing 21 and a second bearing 22, which are slidably disposed relative to each other and are both capable of moving axially relative to the first roller 11, the second roller 12 and the third roller 13.

[0052] The first bearing 21 is provided with a first engaging portion 211 and a second engaging portion 212, which are spaced apart. The first engaging portion 211 is located in the first movable cavity 111, and the second engaging portion 212 is located in the fourth movable cavity 1242. The second engaging portion 212 engages with one of the third engaging portion 1243 and the fourth engaging portion 1244. When the first bearing 21 moves to the left along the axial direction, the first engaging portion 211 engages with the first engaging portion 112, and the second engaging portion 212 changes from engaging with the fourth engaging portion 1244 to engaging with the third engaging portion 1243. When the first bearing 21 moves to the right along the axial direction, the first engaging portion 211 disengages from the first engaging portion 112, and the second engaging portion 212 changes from engaging with the third engaging portion 1243 to engaging with the fourth engaging portion 1244.

[0053] The second bearing 22 is provided with a third engaging part 221 and a fourth engaging part 222, which are spaced apart. The third engaging part 221 is located in the fifth movable cavity 1252, and the fourth engaging part 222 is located in the second movable cavity 131. When the second bearing 22 moves to the left in the circumferential direction, the third engaging part 221 engages with the fifth engaging part 1253, and the fourth engaging part 222 engages with the second engaging part 132. When the bearing 20 moves to the right in the circumferential direction, the third engaging part 221 disengages from the fifth engaging part 1253, and the fourth engaging part 222 disengages from the second engaging part 132.

[0054] The printing press roller 100 also includes a bearing sleeve 23, which is fitted over one end of the bearing 20. An elastic element 50 is provided inside the bearing sleeve 23, with its two ends abutting against the bottom wall of the bearing sleeve 23 and the bearing 20, respectively. Specifically, the elastic element 50 includes a first elastic element 51 and a second elastic element 52. The first elastic element 51 abuts against the bearing sleeve 23 and the first bearing 21, and the second elastic element 52 abuts against the bearing sleeve 23 and the second bearing 22.

[0055] The adjusting assembly 30 connects to the end of the bearing 20 away from the elastic element 50. The adjusting assembly 30 enables the first bearing 21 and the second bearing 22 to overcome the elastic forces of the first elastic element 51 and the second elastic element 52, respectively, so that the first bearing 21 and the second bearing 22 can move axially and thus engage at least one of the first roller 11, the second roller 12 and the third roller 13.

[0056] See Figure 12The adjustment assembly 30 includes a second drive member 31 and an adjustment member 32. The adjustment member 32 is disposed at the output end of the second drive member 31. The end of the adjustment member 32 is provided with a protrusion 321, which is used to abut against the bearing 20. When the second drive member 31 drives the adjustment member 32 to rotate, the protrusion 321 can abut against the first bearing 21 to move axially, or abut against the second bearing 22 to move axially, or abut against the first bearing 21 and the second bearing 22 to move axially together.

[0057] It is understandable that the second drive component 31 can be a motor. An adjustment component 30 is provided at the end of the bearing 20. By controlling the rotation of the second drive component 31, the working positions of the first bearing 21 and the second bearing 22 can be controlled, thereby forming multiple connection states to adapt to the various working states of the roller. The structure is simple and ingenious.

[0058] When the protrusion 321 abuts against the first bearing 21 and moves axially to the left, while the second bearing 22 is not abutted and remains stationary, the first engaging part 211 engages with the first meshing part 112, and the second engaging part 212 changes from engaging with the fourth meshing part 1244 to engaging with the third meshing part 1243. The third engaging part 221 disengages from the fifth meshing part 1253, and the fourth engaging part 222 disengages from the second meshing part 132. Thus, when the first driving member 40 drives the first bearing 21 and the second bearing 22 to rotate, the first bearing 21 moves axially to the left, while the second bearing 22 remains stationary. The first engaging part 211 drives the first engaging part 112 to rotate, which in turn drives the first roller 11 to rotate. The second engaging part 212 drives the third engaging part 1243 to rotate, which in turn drives the first inner cylinder 124 to rotate. The first driving helical gear 1241 in the first inner cylinder 124 drives the driven helical gear 123 to rotate. The second roller 12 cannot rotate. The fourth engaging part 222 cannot drive the second engaging part 132 to rotate. The third roller 13 does not rotate. Therefore, at this time, only the first roller 11 is printing.

[0059] When the first bearing 21 is not supported, and the protrusion 321 supports the second bearing 22 and rotates axially to the left, the first engaging part 211 disengages from the first engaging part 112, the second engaging part 212 engages with the fourth engaging part 1244, the third engaging part 221 engages with the fifth engaging part 1253, and the fourth engaging part 222 engages with the second engaging part 132. Thus, when the first driving member 40 drives the first bearing 21 and the second bearing 22 to rotate, the second engaging part 212 drives the fourth engaging part 1244 to rotate. Further, the first inner cylinder 124 rotates, and the first driving helical gear 1241 rotates with the first inner cylinder 124. When the second inner cylinder 125 rotates, the third locking part 221 drives the fifth meshing part 1253 to rotate, the second inner cylinder 125 rotates, the second driving helical gear 1251 rotates with the second inner cylinder 125, the first driving helical gear 1241 and the second driving helical gear 1251 mesh together with the driven helical gear 123, so that when rotating, the driven helical gear 123 cannot rotate on its own and drive the outer cylinder 121 to rotate, that is, the second roller 12 rotates, the fourth locking part 222 rotates and drives the second meshing part 132 to rotate, and further the third roller 13 rotates. Therefore, at this time, the second roller 12 and the third roller 13 rotate together for printing.

[0060] When the protrusion 321 abuts against the first bearing 21 and rotates to the left along the axial direction, and abuts against the second bearing 22 and rotates to the left along the axial direction, the first locking part 211 engages with the first meshing part 112, thereby causing the first roller 11 to rotate. The second locking part 212 engages with the third meshing part 1243, and the third locking part 221 engages with the fifth meshing part 1253, thereby causing the first driving helical gear 1241 and the second driving helical gear 1251 to rotate together. Furthermore, the driven helical gear 123 drives the outer cylinder 121 to rotate, that is, the second roller 12 to rotate. The fourth locking part 222 engages with the second meshing part 132, and the third roller 13 rotates. At this time, the first roller 11, the second roller 12, and the third roller 13 rotate together for printing.

[0061] The adjustment assembly 30 also includes a transition member 33, which is axially slidably connected to the first bearing 21 and the second bearing 22 and is circumferentially fixed. The second driving member 31 is fixedly disposed in the transition member 33, and the adjustment member 32 is disposed in the transition member 33. Thus, when the first bearing 21 and the second bearing 22 rotate, the rotating members rotate together, and the second driving member 31 rotates together, ensuring reliable transmission.

[0062] The output end of the first drive unit 40 is provided with an output gear 41, which meshes with the first bearing 21 and the second bearing 22. Regardless of whether the first bearing 21 and the second bearing 22 move axially, the output gear 41 meshes with both the first bearing 21 and the second bearing 22.

[0063] Specifically, the first bearing 21 is provided with a first gear part 213, and the second bearing 22 is provided with a second gear part 223. The first gear part 213 and the second gear part 223 form a ring, thereby meshing with the output gear 41. When the first bearing 21 and the second bearing 22 are misaligned due to axial movement, the first gear part 213 and the second gear part 223 are misaligned, but they can still mesh with the output gear 41 to ensure smooth transmission.

[0064] The printing press roller 100 also includes a first support 60 and a second support 70, which are respectively disposed at the two ends of the first bearing 21 and the second bearing 22. The bearing sleeve 23 is disposed on the first support 60, and the adapter 33 is disposed on the second support 70, thereby realizing the function of supporting the first bearing 21 and the second bearing 22. The first drive member 40 is disposed on the first support 60.

[0065] The printing press roller provided by this invention has an adjustment component that can control the number of the first, second, and third rollers connected by the bearing. This further enables the bearing to drive the number of rollers when the first drive component drives the bearing to rotate. Different numbers of rollers result in different printing lengths, thus achieving adjustable printing length, adapting to various working conditions, having good flexibility, and broad application prospects.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any appropriate changes and variations made to the above embodiments within the essential spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A printing press roller, characterized in that, include: The roller includes a first roller, a second roller, and a third roller, wherein the first roller and the third roller are respectively disposed at both ends of the second roller; A bearing, wherein the bearing passes through the first roller, the second roller and the third roller; An adjustment assembly is connected to one end of the bearing and enables the bearing to move axially relative to the rollers, such that the bearing engages with at least one of the first roller, the second roller, and the third roller; A bearing sleeve, wherein the bearing sleeve is fitted onto one end of the bearing, and the bearing sleeve is provided with an elastic element, the two ends of the elastic element respectively abutting against the bearing sleeve and the bearing; A first driving component, the output end of which can drive the bearing to rotate, so that the bearing drives at least one of the first roller, the second roller, and the third roller to rotate for printing. The bearing includes a first bearing and a second bearing that are slidably disposed with respect to each other. The first bearing is provided with a first snap-fit ​​part and a second snap-fit ​​part. The position of the first snap-fit ​​part is correspondingly disposed inside the first roller, and the position of the second snap-fit ​​part is disposed inside the second roller. The second bearing is provided with a third locking part and a fourth locking part. The third locking part is positioned inside the second roller, and the fourth locking part is positioned inside the third roller. The first bearing is axially movable relative to the roller to engage the first roller and / or the second roller; the second bearing is axially movable relative to the roller to engage the second roller and / or the third roller. The first roller has a first movable cavity, and the first movable cavity has a first engaging part at one end near the second roller, and the first snap-fit ​​part is disposed in the first movable cavity; The third roller has a second movable cavity, and a second engaging part is provided at the end of the second movable cavity away from the second roller. The fourth snap-fit ​​part is disposed in the second movable cavity. The second roller includes: The outer cylinder has a third movable cavity inside, and a driven helical gear is provided inside the third movable cavity; A first inner cylinder passes through the outer cylinder and is relatively close to the third roller. One end of the first inner cylinder includes a first driving helical gear. The first driving helical gear is disposed in the third movable cavity and meshes with the driven helical gear. The first inner cylinder includes a fourth movable cavity. The two ends of the fourth movable cavity are respectively provided with a third meshing part and a fourth meshing part. A second snap-fit ​​part is disposed in the fourth movable cavity. The first bearing moves axially so that the second snap-fit ​​part meshes with the third meshing part and the fourth meshing part respectively. The second inner cylinder passes through the outer cylinder and is relatively close to the first roller. One end of the second inner cylinder includes a second driving helical gear. The second driving helical gear is disposed in the third movable cavity and meshes with the driven helical gear. The second inner cylinder includes a fifth movable cavity. The end of the fifth movable cavity near the driven helical gear is provided with a fifth meshing part. The third snap-fit ​​part is disposed in the fifth movable cavity. The second bearing can move axially to make the third snap-fit ​​part engage or disengage from the fifth meshing part.

2. The printing press roller as described in claim 1, characterized in that: The elastic element includes a first elastic element and a second elastic element, wherein the first elastic element abuts against the first bearing and the second elastic element abuts against the second bearing.

3. The printing press roller as described in claim 2, characterized in that: When the first bearing moves axially relative to the first roller, the first engaging part moves in the first movable cavity. The first engaging part can engage or disengage from the first engaging part, so that the first bearing can drive the first roller to rotate or disengage from the first roller to idle.

4. The printing press roller as described in claim 3, characterized in that: When the second bearing moves axially relative to the third roller, the fourth engaging part moves in the second movable cavity. The fourth engaging part can engage or disengage from the second engaging part, so that the second bearing can drive the third roller to rotate or disengage from the third roller to idle.

5. The printing press roller as described in claim 4, characterized in that: The adjustment assembly includes a second driving member and an adjusting member. The adjusting member is disposed at the output end of the second driving member, and the end of the adjusting member is provided with a protrusion. The protrusion abuts against the bearing, and the second driving member can drive the adjusting member to rotate. Wherein, the protrusion abuts against the first bearing and moves axially against the elastic force of the first elastic member, such that the first snap-fit ​​part snaps against the first engagement part, the second snap-fit ​​part changes from snapping against the fourth engagement part to snapping against the third engagement part, the protrusion disengages from the first bearing, the first elastic member abuts against the first bearing and resets, the first snap-fit ​​part disengages from the first engagement part, and the second snap-fit ​​part changes from snapping against the third engagement part to snapping against the fourth engagement part; The protrusion abuts against the second bearing and moves axially against the elastic force of the second elastic member, so that the third locking part engages with the fifth engaging part, the fourth locking part engages with the second engaging part, the protrusion disengages from the first bearing, the third locking part disengages from the fifth engaging part, and the fourth locking part disengages from the second engaging part.

6. The printing press roller as described in claim 5, characterized in that: The number of driven helical gears is two, and the two driven helical gears are symmetrically arranged along the bearing and respectively mesh with different parts of the first driving helical gear and the second driving helical gear.

7. The printing press roller as described in claim 6, characterized in that: The first roller, the second roller, and the third roller have the same length and width.

8. The printing press roller as described in claim 7, characterized in that: The first drive unit has an output gear at its output end, and the output gear meshes with the first bearing and the second bearing.

9. The printing press roller as described in claim 8, characterized in that: The printing press roller also includes a first support and a second support, which are respectively disposed at both ends of the bearing and are used to support the bearing.

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