Offset printing mechanism with cam clamping

Abstract

The present application relates to a cam type plate clamping offset printing mechanism, comprising a plate roller and a plate locking shaft, the plate roller is provided with an axial through hole, the plate locking shaft is arranged in the through hole, the plate roller is further provided with a plate mounting groove, the through hole and the roller surface of the plate roller are communicated through the plate mounting groove, the plate locking shaft adopts a shaft body without a plate locking groove, the shaft body is provided with an arc rotating support surface matched with the through hole, an inner recessed arc plate clamping surface connected to one end of the arc rotating support surface, and a connecting portion connected between the other end of the arc rotating support surface and the inner recessed arc plate clamping surface, one side of the plate mounting groove is provided with a plate clamping pressure surface matched with the inner recessed arc plate clamping surface for clamping the plate, and a plate clamping matching gap is left between the inner recessed arc plate clamping surface and the plate clamping pressure surface. The structure is simplified, the plate locking groove does not need to be additionally arranged on the shaft body of the plate locking shaft, and the problem that the plate end is not easy to operate when inserted into the plate locking groove is avoided; the plate end does not need to be additionally inserted into the plate locking groove on the shaft body.

Description

Technical Field

[0001] This invention relates to an offset printing mechanism with a cam-type clamping plate. Background Technology

[0002] In printing equipment, the printing plate rollers of the offset printing mechanism need to be used to mount the printing plate. For example, in the mounting structure, a round shaft needs to rotate in a round hole, and a groove is cut on the round shaft so that one end of the printing plate can be bent and inserted. Then, by rotating the round shaft, the printing plate is pulled tightly against the outer circumference of the printing roller, and the round shaft is locked to prevent it from rotating, thus achieving the clamping and fixing of the printing plate during disassembly and assembly. In their structure, not only is it necessary to additionally cut a groove on the round shaft to form a locking groove, but during the additional printing plate installation process, the printing plate needs to be aligned and inserted into the locking groove of the round shaft to ensure smooth installation. In addition, the thickness of different batches of printing plates varies, making it difficult for the round shaft to stably clamp (press) the two ends of printing plates of different thicknesses onto the locking mating surface. Summary of the Invention

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a cam-type clamping offset printing mechanism with a relatively simple structure and convenient operation.

[0004] To solve the above technical problems, the present invention adopts the following technical solution: a cam-type offset printing mechanism for clamping plates, comprising a plate roller and a plate locking shaft, wherein the plate roller has an axially arranged through hole, the plate locking shaft is disposed in the through hole, and the plate roller also has a plate mounting groove, the through hole and the roller surface of the plate roller are connected through the plate mounting groove, characterized in that: the plate locking shaft adopts a shaft body without a plate locking groove, the shaft body has an arc-shaped rotating support surface that matches the rotation in the through hole, an inward arc-shaped clamping plate surface connected to one end of the arc-shaped rotating support surface, and a connecting part connecting the other end of the arc-shaped rotating support surface and the inward arc-shaped clamping plate surface, one side of the plate mounting groove is a clamping pressure surface that matches the inward arc-shaped clamping plate surface for clamping the plate, and a clamping fit gap is left between the inward arc-shaped clamping plate surface and the clamping pressure surface.

[0005] The following optimizations or supplementary explanations can be made to the above technical solutions.

[0006] For example, the pressure-bearing surface of the clamping plate is set as the pressure-bearing plane of the clamping plate, and the pressure-bearing surface of the clamping plate is connected to the through hole.

[0007] For example, the pressure-bearing plane of the clamping plate is connected to the through hole in an intersecting or tangential manner.

[0008] In addition, the connecting part is set as an inward step on the rotating shaft body; even more, the connection between the connecting part and the arc rotating support surface also has a plate ejection part, which is used to eject the plate insertion end when the plate locking rotating shaft reverses.

[0009] For example, the center of the inward-curved clamping plate is set eccentrically relative to the center of the curved rotating support surface.

[0010] The other side of the mounting slot and the pressure-bearing surface of the clamping plate form the mounting channel of the mounting slot.

[0011] In addition, the main body of the printing roller is a roller, and roller rests are respectively connected to both ends of the main body of the printing roller. At least one end of the locking shaft is set as a rotation operation end. At least one end of the main body of the printing roller is provided with a shaft tensioning component for operating the tension of the locking shaft. The shaft tensioning component is located on the outside of the roller rest.

[0012] For example, the shaft tensioning component includes a tensioning clamp and a tensioning fastener. The tensioning clamp has a tensioning shaft hole, and the end of the shaft body is fitted into the tensioning shaft hole. The tensioning fastener is connected to the tensioning clamp and is used to loosen or lock the shaft body in the tensioning shaft hole. The rotating operation end is exposed on the outside of the tensioning shaft hole.

[0013] Furthermore, the through holes are circular and have openings that connect to the mounting slots. Further optimization involves using smooth, serrated, or knurled surfaces for the inward-curving or non-circular-curving clamping cam surface.

[0014] In the above scheme, the inward-curved clamping plate surface can be replaced by the inward-curved non-curved clamping plate cam surface.

[0015] The beneficial effects of this invention are as follows: the offset printing mechanism with a cam-type clamping plate simplifies the structure, eliminating the need for an additional clamping groove on the shaft body of the locking plate rotating shaft, thus avoiding the problem of difficulty in operation when the printing plate end is inserted into the clamping groove; the locking plate rotating shaft forms a cam structure, changing the relative position between the inner arc clamping surface and the clamping pressure surface by rotating the shaft body, thereby changing the size of the clamping gap and completing the plate loading, clamping, and releasing actions. There is no need for the printing plate end to be inserted into the clamping groove on the rotating shaft body (no clamping groove required), making plate assembly more convenient. Simply surround the printing plate on the plate roller, place both ends of the printing plate between the locking plate rotating shaft (shaft body) and the clamping pressure surface, and rotate the locking plate rotating shaft to complete the locking and releasing operations. This facilitates printing plate assembly and disassembly; after release, the printing plate can be directly removed from the plate loading slot. Attached Figure Description

[0016] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of the present invention.

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 Right view.

[0019] Figure 3 for Figure 1 Cross-sectional view of the middle HH section, with the printing plate not clamped.

[0020] Figure 4 for Figure 3 Another structural diagram, showing the printing plate being clamped.

[0021] In the picture: 1. Printing roller; 10. Roller; 11. Through hole; 12. Plate mounting slot; 13. Clamping pressure surface; 14. Roller rest; 2. Locking shaft; 20. Shaft body; 21. Arc-shaped rotating support surface; 22. Inward-curving arc-shaped clamping surface; 23. Connecting part; 24. Rotation operation end; 3. Shaft tensioning components; 30. Tensioning clamps; 31. Tensioning fasteners; 4. Printing plate. Detailed Implementation

[0022] 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 implementation of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Referring to the accompanying drawings, the offset printing mechanism of the cam-type clamping plate in this embodiment includes a plate roller 1 and a plate locking shaft 2. The plate roller 1 has an axially arranged through hole 11, and the plate locking shaft 2 is disposed in the through hole 11. The plate roller 1 also has a plate mounting groove 12. The through hole 11 and the roller surface of the plate roller 1 are connected through the plate mounting groove 12 so that after the printing plate 4 is wrapped around the plate roller 1, both ends of the printing plate 4 pass through the plate mounting groove 12 and enter the plate roller 1 to cooperate with the clamping plate for fixation.

[0024] Among them, the locking shaft 2 adopts a shaft body 20 without a locking groove, that is, there is no need to open an additional locking groove on the shaft body 20 for the end of the printing plate 4 to be inserted, which simplifies the structure and optimizes the operation. The end of the printing plate 4 does not need to be inserted into the locking groove of the shaft body 20, avoiding the problem of inaccurate insertion in a narrow and difficult-to-observe space.

[0025] The rotating shaft body 20 has an arc-shaped rotation support surface 21, an inwardly recessed arc-shaped clamping plate surface 22, and a connecting part 23. The circular arc rotating support surface 21 rotates within the through hole 11, and the rotating shaft body 20 of the locking plate rotating shaft 2 rotates within the through hole 11, stably supported by the circular arc rotating support surface 21. The inward-curved clamping plate 22 is connected to one end of the arc-shaped rotating support surface 21. The inward-curved clamping plate 22 is connected to the arc-shaped rotating support surface 21, and the inward-curved clamping plate 22 is recessed relative to the arc-shaped rotating support surface 21. That is, the arc of the inward-curved clamping plate 22 is radially recessed relative to the arc of the arc-shaped rotating support surface 21. The other end of the circular arc rotating support surface 21 is connected to the inward circular arc clamping plate surface 22 by a connecting part 23. The rotating body 20 of the locking shaft 2 is composed of an arc rotating support surface 21, an inward arc clamping surface 22, and a connecting part 23, forming a circumferential segmented structure.

[0026] One side of the mounting groove 12 is the clamping pressure surface 13. The clamping pressure surface 13, together with the inward-curving clamping surface 22, is used to clamp and fix the printing plate 4. The locking shaft 2 rotates so that the inward-curving clamping surface 22 faces the clamping pressure surface 13 and clamps and fixes the end of the clamping plate. During the rotation of the locking shaft 2, its inward-curving clamping surface 22 presses against the clamping pressure surface 13 and gradually tightens it. There is a clamping gap between the inward-curving clamping surface 22 and the clamping pressure surface 13. The two ends of the printing plate 4 (the head and the tail) can be clamped and fixed in the clamping gap. During the rotation of the locking shaft 2, the inward-curving clamping surface 22 can also rotate and rub the printing plate 4 while pressing it, tightening the printing plate 4 so that the printing plate 4 is tightly attached to the circumferential roller surface of the printing roller 1.

[0027] In this design, the inward-retracting arc clamping surface 22 is radially retracted relative to the arc rotating support surface 21 and connected to one end of the arc rotating support surface 21. When the locking shaft 2 rotates in the forward direction, the clamping gap between the inward-retracting arc clamping surface 22 and the clamping pressure surface 13 gradually decreases, and the inward-retracting arc clamping surface 22 and the clamping pressure surface 13 clamp the end of the printing plate 4 located between them, achieving cam-type clamping fixation. Furthermore, during the forward rotation of the inward-retracting arc clamping surface 22, it can also pull and roll the printing plate inward, making the printing plate 4 and the roller surface of the printing roller 1 more closely adhere. When the locking shaft 2 rotates in the reverse direction, the clamping gap between the inward-retracting arc clamping surface 22 and the clamping pressure surface 13 gradually increases, loosening the end of the printing plate 4 to facilitate the removal of the printing plate 4.

[0028] This cam-type offset printing mechanism simplifies the structure, eliminating the need for an additional locking groove on the shaft body 20 of the locking shaft 2, thus avoiding the problem of difficulty in inserting the end of the printing plate 4 into the locking groove. The locking shaft 2 forms a cam structure, changing the relative position between the inner arc clamping surface 22 and the clamping pressure surface 13 by rotating the shaft body 20, thereby changing the size of the clamping clearance and completing the plate loading, clamping, and releasing actions. There is no need for the end of the printing plate 4 to be inserted into the locking groove on the shaft body 20 (no locking groove required). The printing plate 4 is more convenient to assemble. After the printing plate 4 is surrounded on the printing roller 1, the two ends of the printing plate 4 are placed between the locking shaft 2 (shaft body 20) and the clamping pressure surface 13. Rotating the locking shaft 2 completes the locking and releasing of the printing plate 4. This facilitates the disassembly and assembly of the printing plate 4. After release, the printing plate 4 can be directly removed from the mounting slot 12. Even during the plate mounting process, the rotation of the shaft body 20 can roll and pull both ends of the printing plate 4 inward, making the printing plate 4 and the roller surface of the plate roller 1 more closely attached, and the printing plate 4 more compact after installation.

[0029] Based on the above embodiments, the following optimizations or further explanations can be made.

[0030] For example, the clamping plate pressure surface 13 is set as the clamping plate pressure plane, which is convenient for processing. The clamping plate pressure surface 13 is connected to the through hole 11. For example, the clamping plate pressure plane and the through hole 11 are connected by intersecting or tangential means to ensure that the inward arc clamping plate surface 22 can smoothly cooperate to clamp the printing plate 4.

[0031] In addition, the connecting part 23 is set as an inward step on the rotating shaft body 20, such as a concave step, which is convenient for processing. When the inward step faces the clamping plate pressure surface 13, it is convenient for both ends of the printing plate 4 to be placed at the clamping plate pressure surface 13.

[0032] In addition, the connection between the connecting part 23 and the arc-shaped rotating support surface 21 also has a plate ejection part 231. The plate ejection part 231 is used to eject the plate insertion end when the plate locking shaft 2 reverses. For example, the plate ejection part 231 is set as the end 231 of the side of the step of the inward step, which can be used to eject the end of the plate (such as the tail end, or even the beginning and end). The plate locking shaft 2 rotates forward to lock the plate, and reverses not only to loosen the plate, but also to eject the end of the plate, releasing the state of the plate and the plate roller being tightly attached and pressed, making it easier to remove the plate from the plate roller.

[0033] Among them, the center of the inner arc clamping plate 22 is set eccentrically relative to the center of the arc rotating support surface 21. The arc structure of the inner arc clamping plate 22 is relatively mature in processing, and the relative positions are unified after the eccentric position is set.

[0034] One side of the mounting groove 12 is the clamping pressure surface 13, and the space between the other side of the mounting groove 12 and the clamping pressure surface 13 is the mounting channel of the mounting groove 12. Both ends of the printing plate 4 extend into the mounting channel of the mounting groove 12. The junction between the mounting groove 12 and the roller surface of the printing roller 1 can be designed as a smooth transition (such as a smooth curved surface transition) to avoid angles that could affect the printing plate. The printing roller 1 has a main body made of roller 10. Roller pads 14 are connected to both ends of the main body of the printing roller 1. At least one end of the locking shaft 2 is a rotating operating end 24. At least one end of the main body of the printing roller 1 has a shaft tensioning component 3 for operating the locking shaft 2. The shaft tensioning component 3 is located on the outside of the roller pads 14. This is a mature technology. The shaft tensioning component 3 is used to tighten or loosen the locking shaft 2. After loosening, the locking shaft 2 can be rotated. After tightening, the locking shaft 2 is locked in a relative position on the printing roller 1. By rotating the locking shaft 2, the rotating operating end 24 can be operated. For example, the rotating operating end 24 can be a wrench-tightening part, allowing the locking shaft 2 to rotate in both directions by wrenching or other methods. For example, the shaft tensioning component 3 includes a tensioning clamp 30 and a tensioning fastener 31. The tensioning clamp 30 has a tensioning shaft hole, and the end of the shaft body 20 is fitted into the tensioning shaft hole. The tensioning fastener 31 is connected to the tensioning clamp 30 and is used to loosen or tighten the shaft body 20 in the tensioning shaft hole. In addition, the rotation operation end 24 is exposed on the outside of the tensioning shaft hole for easy operation.

[0035] The through hole 11 is a circular hole with an opening that connects to the mounting slot 12. The locking shaft 2 rotates stably in the through hole 11, and the circular hole 11 is well-made. The inner arc clamping surface 22 or the inner non-arc clamping cam surface is made of smooth, serrated, or knurled surface. When using a serrated or knurled surface for mounting, the rotation of the shaft body 20 will better roll and pull the two ends (head and tail) of the printing plate 4 inward, ensuring that it can be pulled tightly and that the printing plate 4 and the roller surface of the printing roller 1 are in close contact and firmly bonded.

[0036] In addition, the inward-curved clamping plate 22 can be replaced by an inward-curved non-curved clamping plate cam surface, and the inward-curved clamping plate 22 is relatively easy to process and manufacture.

Claims

1. A cam-type offset printing mechanism, comprising a printing roller (1) and a plate-locking shaft (2), wherein the printing roller (1) has an axially arranged through hole (11), and the plate-locking shaft (2) is disposed in the through hole (11). The printing roller (1) is also provided with a plate mounting groove (12), and the through hole (11) is connected to the roller surface of the printing roller (1) through the plate mounting groove (12). : The locking plate pivot (2) adopts a pivot body (20) without a locking plate groove. The rotating shaft body (20) has an arc-shaped rotating support surface (21) that matches the rotation in the through hole (11), an inward arc-shaped clamping plate (22) connected to one end of the arc-shaped rotating support surface (21), and a connecting part (23) connected between the other end of the arc-shaped rotating support surface (21) and the inward arc-shaped clamping plate (22). One side of the mounting slot (12) is a clamping pressure surface (13) that is used to clamp the plate with the inward-curved clamping surface (22). There is a clamping gap between the inward-curved clamping surface (22) and the clamping pressure surface (13).

2. The offset printing mechanism with a cam-type clamping plate as described in claim 1, characterized in that: The clamping plate pressure surface (13) is set as the clamping plate pressure plane. The pressure-bearing surface (13) of the clamp plate is connected to the through hole (11).

3. The offset printing mechanism with a cam-type clamping plate as described in claim 2, characterized in that: The pressure plane of the clamping plate is connected to the through hole (11) in an intersecting or tangential manner.

4. The offset printing mechanism with a cam-type clamping plate as described in claim 1, characterized in that: The connecting part (23) is set as an inward step on the rotating shaft body (20); The connection between the connecting part (23) and the circular arc rotating support surface (21) also has a disassembly ejection part (232). The plate ejection part (232) is used to eject the plate insertion end when the plate locking shaft (2) reverses.

5. The offset printing mechanism with a cam-type clamping plate as described in claim 1, characterized in that: The center of the inner arc clamping plate (22) is set to be relatively eccentric with the center of the arc rotating support surface (21).

6. The offset printing mechanism with a cam-type clamping plate as described in claim 1, characterized in that: The other side of the mounting slot (12) and the clamping pressure surface (13) form the mounting channel of the mounting slot (12).

7. The offset printing mechanism with a cam-type clamping plate as described in claim 1, characterized in that: The main body of the printing roller (1) is a roller (10), and roller pillows (14) are respectively connected to both ends of the main body of the printing roller (1). At least one end of the locking shaft (2) is set as a rotation operation end (24), and at least one end of the main body of the printing roller (1) is provided with a shaft tensioning component (3) for operating the tension of the locking shaft (2). The shaft tensioning component (3) is set on the outside of the roller (14).

8. The offset printing mechanism with a cam-type clamping plate as described in claim 7, characterized in that: The shaft tensioning component (3) includes a tensioning clamp (30) and a tensioning fastener (31). The tensioning clamp (30) has a tensioning shaft hole, and the end of the shaft body (20) is fitted into the tensioning shaft hole. The fastener (31) is connected to the fastener block (30) and is used to loosen or lock the rotating shaft body (20) in the fastener shaft hole. The rotating operating end (24) is exposed on the outside of the tension clamp shaft hole.

9. The offset printing mechanism with a cam-type clamping plate as described in any one of claims 1, 2, 3, 4, 6, 7, or 8, characterized in that: The through hole (11) is a circular hole and has an opening that connects to the mounting slot (12); The inner arc clamping plate surface (22) or the inner non-arc clamping plate cam surface adopts a smooth surface, a sawtooth surface or a straight knurled surface.

10. The offset printing mechanism with a cam-type clamping plate as described in claim 9, characterized in that: The inner-retracting circular arc clamping plate surface (22) is replaced by the inner-retracting non-circular arc clamping plate cam surface.

Images