Printing cylinder arrangement of a printing press

Abstract

This utility model discloses a printing roller structure for a printing press, including a mandrel, a printing plate cylinder, and a printing plate cylinder axial adjustment assembly. The mandrel has a guide key on its outer wall; the printing plate cylinder has a keyway corresponding to the guide key on its inner wall. The printing plate cylinder is sleeved on the mandrel, with a fitting end and an assembly end at its two ends. A bushing extends axially from the assembly end, and a bearing is installed outside the bushing. The printing plate cylinder axial adjustment assembly includes a printing plate cylinder outer sleeve and an adjusting nut. The printing plate cylinder outer sleeve is detachably sleeved on the mandrel, and both the outer sleeve and the mandrel are rotatably configured. The outer sleeve has an external thread, and one end of the adjusting nut has an internal thread that connects with the threaded connection of the outer sleeve. The other end of the adjusting nut is sleeved outside the bearing, and the adjusting nut moves synchronously with the printing plate cylinder axially. Rotating the adjusting nut causes it to move axially relative to the outer sleeve, which in turn drives the printing plate cylinder to move axially relative to the outer sleeve and the mandrel, thereby achieving axial color registration of the printing plate cylinder.

Description

Technical Field

[0001] This utility model relates to the field of printing equipment, specifically to a printing roller structure for a printing machine. Background Technology

[0002] In the field of trademark printing equipment, most printing rollers are of a split structure, that is, the printing cylinder is tensioned and fixed on the mandrel by an air shaft. However, the air shaft and its matching air circuit control system have high manufacturing costs, and after long-term use, there are hidden dangers such as air pressure leakage and uneven tension, which increases the economic burden of equipment manufacturing and maintenance.

[0003] On the other hand, in order to achieve accurate registration in multi-color printing, existing technologies usually configure a servo motor independently for each printing plate cylinder to drive its axial movement and circumferential fine adjustment, thereby compensating for the color registration deviation of the printing material and the preceding color group, but this has the problem of high cost. Utility Model Content

[0004] In view of the technical problems existing in the background art, the technical problem solved by this utility model is to provide a printing roller structure for a printing machine that is simple in structure, convenient to adjust and low in processing cost.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: the printing roller structure of this printing machine is characterized by including a mandrel, a printing plate cylinder, and a printing plate cylinder axial adjustment assembly. A guide key is provided on the outer wall of the mandrel; The inner wall of the printing plate cylinder is provided with a keyway corresponding to the guide key. The printing plate cylinder is sleeved on the outside of the mandrel. The two ends of the printing plate cylinder are the insertion end and the assembly end, respectively. A bushing extends axially from the assembly end, and a bearing is installed on the outside of the bushing. The axial adjustment assembly for the printing plate cylinder includes a printing plate cylinder outer sleeve and an adjusting nut. The printing plate cylinder outer sleeve is detachably sleeved on the outside of the mandrel, and the printing plate cylinder outer sleeve and the mandrel are rotatably configured. The printing plate cylinder outer sleeve has an external thread, and one end of the adjusting nut has an internal thread that is threadedly connected to the printing plate cylinder outer sleeve. The other end of the adjusting nut is sleeved on the outside of the bearing, and the adjusting nut moves synchronously with the axial direction of the printing plate cylinder.

[0006] The separate assembly structure of the printing plate cylinder and the mandrel in this utility model achieves circumferential positioning of the printing plate cylinder sleeve and the mandrel through the cooperation of the keyway and the guide key. The rotation of the mandrel can drive the printing plate cylinder sleeve to rotate synchronously through the guide key. At the same time, the guiding function of the keyway can also ensure the axial assembly accuracy. The axial position of the printing plate cylinder relative to the mandrel is adjusted by the adjusting nut. Rotating the adjusting nut moves it axially relative to the outer sleeve of the printing plate cylinder, which in turn drives the printing plate cylinder to move axially relative to the outer sleeve of the printing plate cylinder and the mandrel, thereby realizing the axial color matching of the printing plate cylinder.

[0007] Preferably, the end of the adjusting nut with the internal thread is the threaded end, and the other end is the linkage end. The inner hole of the linkage end is stepped, including a limiting section and an assembly section, with a stepped surface formed between the two sections. The diameter of the assembly section is larger than the outer diameter of the bearing and is fitted onto the outside of the bearing. The diameter of the limiting section is smaller than the outer diameter of the bearing. The end of the bearing facing the stepped surface abuts against the stepped surface, and the other end of the bearing is provided with a limiting member, which is connected to the adjusting nut. The two axial ends of the bearing are positioned by the stepped surface and the limiting member. The axial movement of the adjusting nut drives the axial movement of the bearing, thereby driving the plate cylinder to move axially synchronously.

[0008] Preferably, the outer diameter of the bushing is smaller than the outer diameter of the plate cylinder, and there is a gap between the bearing and the end face of the assembly end for accommodating the limiting member.

[0009] Preferably, the limiting member is a baffle plate. When the plate cylinder, adjusting nut and plate cylinder outer sleeve are coaxial, the vertical distance from the inner surface of the baffle plate toward the spindle to the central axis is less than the vertical distance from the outer wall of the bearing to the central axis. After the printing plate cylinder and adjusting nut are detached from the mandrel and printing plate cylinder sleeve, the maximum radial clearance between the assembly section and the bearing is greater than the vertical distance from the inner surface of the baffle to the inner wall of the assembly section. When the connected printing plate cylinder, adjusting nut, and printing plate cylinder sleeve are sequentially fitted onto the mandrel, the three are in a coaxial state. At this time, the axial ends of the bearing are positioned by the stepped surface and the limiting component. When the printing plate cylinder sleeve, adjusting nut, and printing plate cylinder are removed from the mandrel, the adjusting nut and printing plate cylinder are eccentric, and the baffle moves axially relative to the bearing, causing the adjusting nut to separate from the printing plate cylinder. This utility model facilitates the replacement of the printing plate cylinder and allows for color matching by rotating the adjusting nut to move the printing plate cylinder axially.

[0010] Preferably, the baffle is detachably mounted on the linkage end face of the adjusting nut. The baffle is concealed, resulting in an aesthetically pleasing appearance and no interference with the printing operation.

[0011] Preferably, the printing roller structure of the printing press also includes a plate cylinder circumferential adjustment assembly, which includes a helical gear mounted on a mandrel. The helical gear meshes with the transmission gear of the impression cylinder, and the impression cylinder is connected to the main motor that drives its rotation. The axial position of the mandrel relative to the printing cylinder is adjustable. The main motor drives the printing cylinder to rotate, which in turn drives the mandrel to rotate. The mandrel, via a guide key, drives the printing plate sleeve to rotate synchronously for printing operations. Simultaneously, the mandrel moves axially relative to the printing cylinder, while a helical gear causes the mandrel to rotate circumferentially relative to the printing cylinder for circumferential color registration. This invention eliminates the need for a separate servo motor, simplifying the structure and reducing electrical costs.

[0012] Preferably, the printing cylinder is rotatably mounted on the frame, and the printing plate sleeve is detachably mounted on the frame; The spindle is connected to a power source that drives it to move axially on the frame, and the power source is mounted on the frame. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a cross-sectional view of the present invention.

[0015] Figure 3 This is a partial schematic diagram of the assembled state of this utility model.

[0016] Figure 4 This is a partial schematic diagram showing the adjusting nut and the plate cylinder of this utility model being removed from the mandrel.

[0017] Reference numerals: 1. Mandrel; 11. Guide key; 2. Plate cylinder; 21. Keyway; 22. Bushing; 3. Adjusting nut; 31. Assembly section; 32. Limiting section; 33. Stepped surface; 4. Plate cylinder outer sleeve; 5. Helical gear; 6. Power source; 7. Gap for accommodating the limiting component; 8. Bearing; 9. Baffle plate; Detailed Implementation

[0018] The following describes the embodiments and related details and working principle of this utility model with reference to the accompanying drawings. The printing roller structure of this printing press includes a mandrel 1, a printing plate cylinder 2, and a printing plate cylinder axial adjustment assembly. A guide key 11 is provided on the outer wall of the mandrel 1; a keyway 21 corresponding to the guide key 11 is provided on the inner wall of the printing plate cylinder 2. The printing plate cylinder is sleeved outside the mandrel 1, with an insertion end and an assembly end at its two ends, respectively. A bushing 22 extends axially from the assembly end, and a bearing 8 is installed outside the bushing. The printing plate cylinder axial adjustment assembly includes a printing plate cylinder outer sleeve 4 and an adjusting nut 3. The printing plate cylinder outer sleeve 4 is detachably sleeved outside the mandrel 1, and both the printing plate cylinder outer sleeve and the mandrel are rotatably configured. The printing plate cylinder outer sleeve 4 has an external thread, and one end of the adjusting nut 3 has an internal thread that connects to the printing plate cylinder outer sleeve 4. The other end of the adjusting nut 3 is sleeved outside the bearing, and the adjusting nut 3 moves axially synchronously with the printing plate cylinder 2. During assembly, the insertion end of the printing plate cylinder faces the mandrel, the keyway 21 is aligned with the guide key 11, and the printing plate cylinder moves axially relative to the mandrel. The printing plate cylinder is fitted onto the mandrel, and the adjusting nut 3 is subsequently fitted onto the mandrel 1. The guide key 11 is engaged in the keyway 21. The guiding function of the keyway ensures axial assembly accuracy and simultaneously positions the printing plate cylinder and mandrel circumferentially. Rotation of the mandrel drives the printing plate cylinder to rotate synchronously via the guide key. The outer sleeve 4 of the printing plate cylinder is fitted onto the mandrel 1 and is located on the outside of the insertion end of the printing plate cylinder. A bearing is installed in the inner hole of the outer sleeve. The outer sleeve can rotate relative to the mandrel. The outer sleeve 4 can be detachably mounted on the frame, for example, by using clamping or holding components to fix the outer sleeve to the frame. This supports the mandrel 1 and allows the mandrel 1 to rotate on the frame. At the same time, the adjusting nut 3 is threadedly connected to the outer sleeve 4 for axial positioning of the printing plate cylinder. The axial position of the printing plate cylinder on the mandrel 1 is adjusted by rotating the adjusting nut 3, thus enabling axial fitting. During assembly, the plate cylinder, adjusting nut, and plate cylinder outer sleeve can be assembled first and then fitted onto the mandrel.

[0019] The printing roller structure of the printing press also includes a plate cylinder circumferential adjustment assembly. This assembly includes a helical gear 5, which is mounted on the mandrel 1. The helical gear 5 meshes with the transmission gear of the impression cylinder (not shown in the figure). The impression cylinder is rotatably mounted on the frame and connected to the main motor that drives its rotation. During printing, the main motor drives the impression cylinder to rotate, which in turn drives the mandrel 1 to rotate via the transmission gear and helical gear 5. The mandrel 1, via guide key 11, drives the plate cylinder sleeve to rotate synchronously. The axial position of the mandrel 1 relative to the impression cylinder is adjustable. Axial movement of the mandrel 1, i.e., helical gear 5, moves axially relative to the transmission gear. Because they mesh, the transmission gear remains stationary, allowing the mandrel 1 to rotate circumferentially relative to the impression cylinder. This rotation of the mandrel 1 causes the plate cylinder to rotate synchronously, performing circumferential color registration. The axial movement of the mandrel 1 can be manually adjusted. Figure 2In this invention, the mandrel 1 is connected to a power source 6 that drives its axial movement on the frame, and the power source is mounted on the frame. The separate assembly structure of the plate cylinder 2 and the mandrel 1 in this invention achieves circumferential positioning of the plate cylinder sleeve and the mandrel through the cooperation of the keyway 21 and the guide key 11. The adjusting nut 3 allows the plate cylinder to move axially relative to the mandrel 1 and the printing cylinder for axial color matching. The axial movement of the mandrel causes the mandrel and the plate cylinder 2 to rotate circumferentially relative to the printing cylinder for circumferential color matching.

[0020] See attached Figure 3 and 4 The adjusting nut 3 has an internal thread at one end, which is the threaded end, and a linkage end at the other end. The inner hole of the linkage end is stepped, including a limiting section 32 and an assembly section 31, with a stepped surface 33 between the two sections. The diameter of the assembly section 31 is larger than the outer diameter of the bearing 8 and is fitted over the bearing. The diameter of the limiting section 32 is smaller than the outer diameter of the bearing 8. The end of the bearing facing the stepped surface abuts against the stepped surface 33. The other end of the bearing has a limiting member, which is connected to the adjusting nut 3. The axial ends of the bearing 8 are limited by the stepped surface 33 and the limiting member. The axial movement of the adjusting nut 3 drives the axial movement of the bearing 8, thereby driving the plate cylinder 2 to move axially synchronously. The outer diameter of the bushing 22 is smaller than the outer diameter of the plate cylinder 2. There is a gap 7 between the bearing and the end face of the assembly end for accommodating the limiting member. The limiting member is a baffle 9. To better conceal the baffle 9, the baffle is detachably installed on the linkage end face of the adjusting nut 3 using screws. The concealed baffle is aesthetically pleasing and does not interfere with the printing operation. See attached Figure 3 When the plate cylinder 2, adjusting nut 3, and plate cylinder outer sleeve 4 are coaxial, the vertical distance A from the inner surface of the baffle 9 towards the spindle to the central axis is less than the vertical distance B from the outer wall of the bearing to the central axis; see attached. Figure 4 After the printing plate cylinder 2 and adjusting nut 3 are detached from the mandrel 1 and the printing plate cylinder outer sleeve 4, the maximum radial clearance D between the assembly section 31 and the bearing 8 is greater than the vertical distance L from the inner surface of the baffle 9 to the inner wall of the assembly section 31. The radial clearance between the adjusting nut 3 and the bearing allows for the movable assembly of the adjusting nut and the printing plate cylinder, thus simplifying the overall structure and making assembly easier. When the printing plate cylinder 2, adjusting nut 3, and printing plate cylinder outer sleeve 4 are fitted outside the mandrel 1, they are coaxial, and the axial ends of the bearing 8 are positioned by the stepped surface 33 and the baffle 9. After the printing plate cylinder outer sleeve 4, adjusting nut 3, and printing plate cylinder are removed from the mandrel 1, the adjusting nut 3 is eccentric to the printing plate cylinder 2, and the baffle 9 moves axially relative to the bearing 8, causing the adjusting nut 3 to separate from the printing plate cylinder.

[0021] The working principle of the preferred embodiment is further explained below with reference to the accompanying drawings: (See attached drawings) Figure 2-4During assembly, the outer sleeve 4 of the printing plate cylinder is connected to the threaded end of the adjusting nut 3. The linkage end of the adjusting nut 3 is eccentrically fitted onto the bearing. The adjusting nut 3 is moved axially relative to the printing plate cylinder, causing the baffle 9 to move to the right end of the bearing, so that the two axial ends of the bearing are locked between the step surface 33 and the baffle 9. Then, the fitting end of the printing plate cylinder is aligned with the mandrel 1 and the keyway 21 is aligned with the guide key 11. The printing plate cylinder, adjusting nut 3, and outer sleeve 4 are sequentially fitted onto the mandrel 1. The guide key enters the keyway. The mandrel 1 enables the printing plate cylinder 2, adjusting nut 3, and outer sleeve 4 to... 4. The three components are coaxially arranged. The outer sleeve 4 of the printing plate cylinder is fixed to the frame. Rotating the adjusting nut 3 causes it to move axially relative to the outer sleeve 4, and through the bearing, drives the printing plate cylinder to move synchronously axially with the adjusting nut 3, allowing the printing plate cylinder to move axially relative to the printing cylinder for axial color registration. When circumferential color registration is required, the mandrel is moved axially. The helical gear 5 on the mandrel rotates circumferentially relative to the transmission gear of the printing cylinder, causing the mandrel to rotate circumferentially relative to the printing cylinder. The rotation of the mandrel 1 drives the printing plate cylinder to rotate circumferentially, achieving circumferential color registration. After registration is complete, the main motor drives the printing cylinder to rotate. The printing cylinder, through the transmission gear and helical gear 5, causes the printing plate cylinder to rotate in opposite directions, performing printing on the substrate. When changing the printing plate cylinder, loosen the outer sleeve 4, move the outer sleeve, adjusting nut, and printing plate cylinder axially, and remove them from the mandrel. After the adjusting nut 3 and printing plate cylinder are disengaged from the mandrel 1, ... Figure 4 As shown, the two are eccentrically set, and the maximum radial clearance between the adjusting nut 3 and the bearing 8 provides a channel for the axial movement of the baffle 9. The adjusting nut 3 is moved axially to separate it from the plate cylinder, and then it can be assembled with the new plate cylinder.

Claims

1. A printing roller structure for a printing press, characterized in that: It includes a mandrel, a printing plate cylinder, and a printing plate cylinder axial adjustment assembly. A guide key is provided on the outer wall of the mandrel; The inner wall of the printing plate cylinder is provided with a keyway corresponding to the guide key. The printing plate cylinder is sleeved on the outside of the mandrel. The two ends of the printing plate cylinder are the insertion end and the assembly end, respectively. A bushing extends axially from the assembly end, and a bearing is installed on the outside of the bushing. The axial adjustment assembly for the printing plate cylinder includes a printing plate cylinder outer sleeve and an adjusting nut. The printing plate cylinder outer sleeve is detachably sleeved on the outside of the mandrel, and the printing plate cylinder outer sleeve and the mandrel are rotatably configured. The printing plate cylinder outer sleeve has an external thread, and one end of the adjusting nut has an internal thread that is threadedly connected to the printing plate cylinder outer sleeve. The other end of the adjusting nut is sleeved on the outside of the bearing, and the adjusting nut moves synchronously with the axial direction of the printing plate cylinder.

2. The printing roller structure of the printing press according to claim 1, characterized in that: The adjusting nut has an internal thread at one end, which is the threaded end, and a linkage end at the other end. The inner hole of the linkage end is stepped, including a limiting section and an assembly section, with a stepped surface formed between the two sections. The diameter of the assembly section is larger than the outer diameter of the bearing and is fitted outside the bearing. The diameter of the limiting section is smaller than the outer diameter of the bearing. The end of the bearing facing the stepped surface abuts against the stepped surface. The other end of the bearing is provided with a limiting member, which is connected to the adjusting nut.

3. The printing roller structure of the printing press according to claim 2, characterized in that: The outer diameter of the bushing is smaller than the outer diameter of the plate cylinder, and there is a gap between the bearing and the end face of the assembly end for accommodating the limiting member.

4. The printing roller structure of the printing press according to claim 2 or 3, characterized in that: The limiting component is a baffle. When the plate cylinder, adjusting nut and plate cylinder outer sleeve are coaxial, the vertical distance from the inner surface of the baffle toward the spindle to the central axis is less than the vertical distance from the outer wall of the bearing to the central axis. After the plate cylinder and adjusting nut are separated from the mandrel and the plate cylinder outer sleeve, the maximum radial clearance between the assembly section and the bearing is greater than the vertical distance from the inner surface of the baffle to the inner wall of the assembly section.

5. The printing roller structure of the printing press according to claim 4, characterized in that: The baffle plate can be detachably installed on the linkage end face of the adjusting nut.

6. The printing roller structure of the printing press according to claim 1, characterized in that: The printing roller structure of the printing press also includes a plate cylinder circumferential adjustment assembly, which includes a helical gear mounted on a mandrel. The helical gear meshes with the transmission gear of the impression cylinder, and the impression cylinder is connected to the main motor that drives its rotation. The axial position of the mandrel relative to the printing cylinder can be adjusted.

7. The printing roller structure of the printing press according to claim 6, characterized in that: The printing cylinder is rotatably mounted on the frame, and the printing plate sleeve is detachably mounted on the frame; The spindle is connected to a power source that drives it to move axially on the frame, and the power source is mounted on the frame.

Images