Printing mechanism of printer

Abstract

The present disclosure provides a printing mechanism of a printing press, including a plate cylinder support device and a plate cylinder transmission device, where a rotating main shaft of the plate cylinder transmission device is disposed on a support frame; a front end of the rotating main shaft is provided with a cylinder shaft clamping opening; separation clearances are formed between clamping jaw units at a periphery of the cylinder shaft clamping opening; an outer clamping transmission surface is disposed outside the clamping jaw units; a clamping tightness transmission body is provided with an inner clamping transmission surface; and the inner clamping transmission surface is disposed outside the outer clamping transmission surface for transmission. The cylinder shaft of the plate cylinder is not directly connected to a drive motor in a through-shaft form, the cylinder shaft of the plate cylinder can be disassembled and assembled independently, making the process more convenient and efficient. The cylinder shaft of the plate cylinder is clamped and released by the cylinder shaft clamping opening for disassembly and assembly. Clamping and expansion of the cylinder shaft clamping opening are achieved by operating the clamping tightness transmission body to actuate the clamping jaw units, which is practical and convenient. The present disclosure is more convenient for replacement and maintenance of the cylinder shaft of the plate cylinder, and is more advantageous for a usage scenario of the plate cylinder in which the cylinder and the cylinder shaft are of an integral structure.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to printing presses, and in particular to a printing mechanism of a printing press.BACKGROUND TECHNOLOGY

[0002] A printing mechanism (such as a flexographic printing mechanism) in a printing press is provided with a plate cylinder shaft. The plate cylinder shaft in the flexographic printing mechanism needs to be lifted for plate change, engagement and disengagement (the plate cylinder shaft is disengaged when the printing is paused, and is engaged when printing is continued). Furthermore, axial movement of the plate cylinder shaft is further required for color registration, ensuring that patterns on different plate cylinder shafts can be aligned. In addition, automatic centering is required when the plate cylinder shaft moves down to a position between an anilox roller and an impression roller. Currently, to achieve the above operations of the plate cylinder shaft, the support structure for the plate cylinder shaft is not sufficiently reasonable. For example, large-stroke lifting is involved during the plate change and the temporary printing pause. Additionally, structures for the automatic centering and the axial movement for color registration occupy a relatively large space.

[0003] Furthermore, the printing mechanism (such as the flexographic printing mechanism) is provided with a plate cylinder for printing. A printing plate is disposed on a circumferential surface of the plate cylinder. Currently, the plate cylinder may be of a split structure (i.e., the cylinder shaft and the cylinder disposed on the cylinder shaft are split), or an integral structure (i.e., the cylinder shaft and the cylinder are connected integrally). In both structures, the cylinder shaft of the plate cylinder is of a through-shaft structure. The cylinder shaft extends completely through the cylinder and is in transmission connection with a drive motor. To achieve this connection, some mechanical transmission structures are also provided, causing difficulties in disassembly and assembly of the cylinder shaft. When maintenance, repair, replacement or specification change is required in use, the entire transmission connection structure between the cylinder shaft and the drive motor is disassembled and assembled, which is time-consuming and laborious. Furthermore, for the cylinder shaft of the through-shaft structure, a replaceable printing plate sleeve may be used to avoid frequent disassembly and assembly of the cylinder shaft. However, additional structures for replacing the printing plate sleeve not only make the plate cylinder more complex, but also lead to many problems such as inaccurate printing due to positional deviation between the printing plate sleeve and the cylinder shaft.SUMMARY OF THE INVENTION Technical problem

[0004] In view of technical problems in the background, a technical problem to be solved by the present disclosure is to provide a printing mechanism of a printing press, in which a cylinder shaft is disassembled and assembled more conveniently, a lifting operation of a support frame is optimized more reasonably, and a structure is more compact.Technical solutions

[0005] To solve the above technical problem, the present disclosure employs the following technical solutions: A printing mechanism of a printing press includes a plate cylinder support device and a plate cylinder transmission device, where the plate cylinder support device includes a support frame; the plate cylinder transmission device is disposed on the support frame; the plate cylinder transmission device includes a rotating main shaft and a clamping tightness transmission body; the rotating main shaft is disposed on the support frame of the plate cylinder support device; a rotating support component is disposed between the rotating main shaft and the support frame; a front end of the rotating main shaft is provided with a cylinder shaft clamping opening; clamping jaw units are disposed at a periphery of the cylinder shaft clamping opening; separation clearances are formed between the clamping jaw units; inner sides of the clamping jaw units define the cylinder shaft clamping opening; and an outer clamping transmission surface is disposed outside the clamping jaw units; and the clamping tightness transmission body is provided with an inner clamping transmission surface; the inner clamping transmission surface is disposed outside the outer clamping transmission surface; and the inner clamping transmission surface is in transmission fit with the outer clamping transmission surface.

[0006] The following various optimizations or supplementary explanations may further be made on the basis of the above technical solution.

[0007] For example, a front end of the support frame is further provided with a cylinder shaft support portion; a cylinder shaft pressing cover is further disposed above the cylinder shaft support portion; the cylinder shaft pressing cover is disposed on the support frame; a mounting position configured to allow a cylinder shaft bearing to be assembled is disposed between the cylinder shaft pressing cover and the cylinder shaft support portion; and a shaft head of a cylinder shaft is assembled in the cylinder shaft clamping opening.

[0008] For example, a mounting hole is formed in the support frame; the rotating main shaft and the clamping tightness transmission body are disposed in the mounting hole; the rotating main shaft axially penetrates into the mounting hole; and the rotating support component is disposed between the rotating main shaft and the mounting hole. For example, a rotating drive motor is in transmission connection with a transmission shaft; a coupling is disposed between the transmission shaft and the rotating main shaft; in addition, the rotating drive motor is further disposed on the support frame; and the rotating drive motor is in transmission connection with the rotating main shaft.

[0009] Also for example, the clamping tightness transmission body is a clamping sleeve; the inner clamping transmission surface is located at an inner ring of the clamping sleeve; the clamping sleeve is sleeved on the rotating main shaft; and the clamping jaw units are arranged circumferentially on the rotating main shaft.

[0010] For example, the inner clamping transmission surface is an inner conical surface, and / or, the outer clamping transmission surface is an outer conical surface. For example, the inner conical surface and / or the outer conical surface is a circular conical surface or a truncated circular conical surface.

[0011] The clamping jaw units may be circumferentially and uniformly arranged.

[0012] Furthermore, a front portion or a rear portion of the clamping tightness transmission body is provided with clamping jaw units; separation clearances are formed between the clamping jaw units; and the inner clamping transmission surface is located at inner sides of the clamping jaw units. The clamping tightness transmission body is further externally connected to a clamping adjustment sleeve; and a clamping adjustment nut is further connected between the clamping adjustment sleeve and the clamping tightness transmission body. The clamping tightness transmission body is in transmission connection with an axial movement transmission device. For example, the axial movement transmission device includes a shift fork arm; the shift fork arm is hinged to the support frame or the shift fork arm axially moves on the support frame; a transmission component is disposed on the shift fork arm; a groove is formed in the clamping tightness transmission body; and the transmission component is disposed in the groove. For example, the groove is an annular groove; the transmission component is a roller; and the clamping tightness transmission body is connected to the rotating main shaft. Furthermore, the axial movement transmission device further includes a shift fork transmission member; the shift fork transmission member is in transmission connection with the shift fork arm; and the shift fork transmission member includes a shift fork power source or a shift fork handle with a locking unit.

[0013] Furthermore, a spiral groove is formed in the rotating main shaft; the spiral groove takes a central axis of the rotating main shaft as a central line; a hollow cavity of the rotating main shaft is formed at a center of the spiral groove; and the hollow cavity communicates with an outer side of the rotating main shaft through the spiral groove.

[0014] A support mandrel may further be disposed in the hollow cavity of the rotating main shaft; a moving clearance is reserved between the support mandrel and the rotating main shaft; a central hole is formed at the central axis of the rotating main shaft; a rear end of the support mandrel is fixedly connected to the rotating main shaft; the central hole includes the hollow cavity; and the support mandrel penetrates into the central hole.

[0015] The support frame is liftable. For example, the plate cylinder support device further includes a first lifting seat, a second lifting seat, a rotating shaft, and a swing seat; the first lifting seat is connected to the second lifting seat; one of the first lifting seat and the second lifting seat is in transmission connection with a floating drive device, and the other of the first lifting seat and the second lifting seat is in transmission connection with a lifting drive device; the rotating shaft is transversely disposed on the first lifting seat; the swing seat is connected to the rotating shaft; a linear sliding pair is connected between the swing seat and the support frame; the linear sliding pair includes a transverse sliding rail and a slider; and the transverse sliding rail is parallel to the rotating shaft; and the support frame is in transmission connection with a transverse movement drive device; and the transverse movement drive device is disposed on the first lifting seat.

[0016] Also for example, a first lifting seat is in transmission connection with a lifting drive device; the lifting drive device is connected to a second lifting seat; and the second lifting seat is in transmission connection with a floating drive device.

[0017] Furthermore, a first lifting seat is connected to a vertical guide rail; and a second lifting seat is connected to a vertical guide rail.

[0018] For example, a floating drive device includes a floating clutch actuating cylinder; a lifting drive device includes a lifting drive motor and a lead screw and nut mechanism; the lifting drive motor is in transmission connection with the lead screw and nut mechanism; a transverse movement drive device includes a transverse movement drive motor, a transverse lead screw, and a drive nut; the drive nut is fixedly disposed on the support frame; the transverse lead screw is in transmission connection with the drive nut; the transverse movement drive motor is in transmission connection with the transverse lead screw; a rotating shaft is a pivot shaft; a swing bearing is disposed between a swing seat and the pivot shaft; the pivot shaft is further connected to a mounting frame; the transverse movement drive motor is disposed on the mounting frame; the transverse lead screw is concentric with the pivot shaft; the support frame includes an axial movement transmission plate; and the drive nut is connected to the axial movement transmission plate.

[0019] Furthermore, a spring pre-tightening device is further disposed between a first lifting seat and a swing seat.

[0020] For example, the spring pre-tightening device includes an axial bolt, a pre-tightening nut, and a pre-tightening spring; the axial bolt is connected to the first lifting seat; a via hole is formed in the swing seat; the axial bolt passes through the via hole and then is threadedly connected to the pre-tightening nut; the via hole is provided with an axial bolt play; the pre-tightening spring is sleeved on the axial bolt; the pre-tightening spring is located between the pre-tightening nut and the swing seat; a spring abutment bushing is disposed on the swing seat; the spring abutment bushing is disposed in the via hole; the pre-tightening spring is located between the pre-tightening nut and the spring abutment bushing of the swing seat; the spring abutment bushing has a through hole; the through hole is configured to allow the axial bolt to pass through; the axial bolt play is formed between the through hole and the axial bolt; and a spring pressing cover is disposed between the pre-tightening nut and the pre-tightening spring.Beneficial effects

[0021] In the plate cylinder transmission device, the cylinder shaft of the plate cylinder is not directly connected to a drive motor in a through-shaft form, the cylinder shaft of the plate cylinder can be disassembled and assembled independently, making the process more convenient and efficient. The cylinder shaft of the plate cylinder is clamped and released by the cylinder shaft clamping opening for disassembly and assembly. Clamping and expansion of the cylinder shaft clamping opening are achieved by operating the clamping tightness transmission body to actuate the clamping jaw units, which is practical and convenient. The present disclosure is more convenient for replacement and maintenance of the cylinder shaft of the plate cylinder, and is more advantageous for a usage scenario of the plate cylinder in which the cylinder and the cylinder shaft are of an integral structure.

[0022] In the plate cylinder support device, the first lifting seat is connected to the second lifting seat. One of the first lifting seat and the second lifting seat performs vertical large-stroke movement lifting, and the other performs a vertical small-stroke flotation lifting, being more practical. The support frame moves up and down with the first lifting seat and the second lifting seat, such that the lifting operation is more reasonable. When the plate cylinder needs to be disengaged, it only floats upward with a small stroke to separate from a lower structure (an anilox roller, an impression roller, and the like). When the plate cylinder is engaged, it only floats downward with a small stroke to engage with the lower structure for printing. With the vertical large-stroke movement, a larger space can be separated in assembly and replacement of the plate cylinder to facilitate operation. Upon this, the support frame for mounting the plate cylinder can further be driven by the transverse movement drive device to transversely move on the swing seat (i.e., in axial directions of the rotating shaft and the plate cylinder) for color registration, achieving a more compact structure. In addition, the mounting frame, the transverse movement drive motor and the like can further be supported by the pivot shaft (i.e., the rotating shaft) and connected to the first lifting seat. The swing seat is supported by the rotating shaft (i.e., the pivot shaft) to swing. The swing seat supports the plate cylinder assembly (plate cylinder transmission device), preventing an excessive load on the swing seat. Therefore, the present disclosure has substantial features and progresses over the prior art.DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a schematic side view of a plate cylinder transmission device according to the present disclosure; FIG. 2 is a sectional view of FIG. 1, and a schematic view after a shift fork arm is swung; FIG. 3 is an enlarged view of A in FIG. 2, where a cylinder shaft is hidden; FIG. 4 is a schematic stereoscopic structural view of a front end of a rotating main shaft, where a clamping adjustment sleeve is disassembled; FIG. 5 is a schematic structural view of a plate cylinder support device according to the present disclosure; FIG. 6 is a left view of FIG. 5; FIG. 7 is a sectional view of A-A in FIG. 5; FIG. 8 is a partially enlarged view of I in FIG. 7; FIG. 9 is a stereoscopic view of FIG. 5; FIG. 10 is a schematic structural view of FIG. 9 from another perspective; and FIG. 11 is a schematic structural view of FIG. 10 from another perspective.

[0024] In the figures: 20: first lifting seat, 21: second lifting seat, 22: rotating shaft, 23: swing seat, 24: support frame, 25: floating drive device, 26: lifting drive device, 27: linear sliding pair, 28: transverse sliding rail, 29: slider, 30: transverse movement drive device, 31: vertical guide rail, 32: vertical guide rail, 33: floating clutch actuating cylinder, 34: lifting drive motor, 35: lead screw and nut mechanism, 36: axial forward movement limit switch, 37: axial backward movement limit switch, 38: switch fitting portion, 39: transverse movement drive motor, 40: transverse lead screw, 41: drive nut, 42: swing bearing, 43: mounting frame, 44: axial movement transmission plate, 45: spring pre-tightening device, 46: axial bolt, 47: pre-tightening nut, 48: pre-tightening spring, 49: spring abutment bushing, 50: via hole, 51: through hole, 52: spring pressing cover, 53: machine frame, and 55: axial bolt play.SPECIFIC IMPLEMENTATIONS

[0025] Referring to figures, a printing mechanism of a printing press in an embodiment includes a plate cylinder support device and a plate cylinder transmission device. The plate cylinder support device includes support frame 24. The plate cylinder transmission device is disposed on the support frame 24. The plate cylinder transmission device may move with the support frame 24.

[0026] In the printing mechanism of a printing press, the plate cylinder transmission device includes rotating main shaft 61 and clamping tightness transmission body 62. The rotating main shaft 61 is disposed on the support frame 24 of the plate cylinder support device. Rotating support component 63 (such as a bearing) is disposed between the rotating main shaft 61 and the support frame 24. The rotating main shaft 61 is supported by the rotating support component 63 on the support frame 24 for rotation.

[0027] A front end of the rotating main shaft 61 is provided with cylinder shaft clamping opening 64 (represented by a dashed box in the figure). That is, cylinder shaft 93 of a plate cylinder may be inserted into the cylinder shaft clamping opening 64, and is clamped.

[0028] Clamping jaw units 65 are disposed at a periphery of the cylinder shaft clamping opening 64. Separation clearances 66 are formed between the clamping jaw units 65. Inner sides of the clamping jaw units 65 define the cylinder shaft clamping opening 64. That is, the periphery of the cylinder shaft clamping opening 64 is divided by the separation clearances 66 into the clamping jaw units 65. When the clamping jaw units 65 clamp inward, they cooperate to clamp the cylinder shaft 93 of the plate cylinder. When loosened, they release the cylinder shaft 93.

[0029] Outer clamping transmission surface 67 is disposed outside the clamping jaw units 65, such that an external force is applied to the outer clamping transmission surface 67 and the clamping jaw units 65 clamp inward.

[0030] The clamping tightness transmission body 62 is provided with inner clamping transmission surface 68. The inner clamping transmission surface 68 is disposed outside the outer clamping transmission surface 67. The inner clamping transmission surface 68 is in transmission fit with the outer clamping transmission surface 67. That is, axial movement of the clamping tightness transmission body 62 is applied to the outer clamping transmission surface 67 through the inner clamping transmission surface 68, allowing the clamping jaw units 65 to clamp inward. Axial retraction of the clamping tightness transmission body 62 causes the inner clamping transmission surface 68 to recede from its position, allowing the clamping jaw units 65 to spread outward and return to their original positions.

[0031] The working principle is as follows: The cylinder shaft 93 of the plate cylinder can be disposed in the cylinder shaft clamping opening 64. The cylinder shaft 93 is clamped and released by the cylinder shaft clamping opening 64 at the front end of the rotating main shaft 61 on the support frame 24. The cylinder shaft 93 of the plate cylinder can be connected to the rotating main shaft 61, which not only realizes mounting for the cylinder shaft 93 of the plate cylinder, but also can drive the cylinder shaft 93 of the plate cylinder to rotate. In assembly, the cylinder shaft 93 of the plate cylinder is inserted into the cylinder shaft clamping opening 64. Then, axial movement of the clamping tightness transmission body 62 outside the rotating main shaft 61 is applied to the outer clamping transmission surface 67 through the inner clamping transmission surface 68, such that the clamping jaw units 65 clamp inward, and the cylinder shaft clamping opening 64 clamps the inserted cylinder shaft 93 of the plate cylinder. In disassembly, the clamping tightness transmission body 62 retracts axially, such that the clamping jaw units 65 are spread out, and the cylinder shaft clamping opening 64 is loosened (expanded) to release the cylinder shaft 93 of the plate cylinder.

[0032] In the plate cylinder transmission device of the printing press, the cylinder shaft 93 of the plate cylinder is not directly connected to a drive motor in a through-shaft structural form, the cylinder shaft of the plate cylinder can be disassembled and assembled independently, making the process more convenient and efficient. The cylinder shaft 93 of the plate cylinder is clamped and released by the cylinder shaft clamping opening 64 for disassembly and assembly. Clamping and expansion of the cylinder shaft clamping opening 64 are achieved by operating the clamping tightness transmission body 62 to actuate the clamping jaw units 65, which is practical and convenient. The present disclosure is more convenient for replacement and maintenance of the cylinder shaft 93 of the plate cylinder, and is more advantageous for a usage scenario of the plate cylinder in which the cylinder and the cylinder shaft are of an integral structure.

[0033] The following optimizations or further explanations may further be made on the basis of the above embodiment.

[0034] For example, a front end of the support frame 24 is further provided with cylinder shaft support portion 69. Cylinder shaft pressing cover 70 is further disposed above the cylinder shaft support portion 69. The cylinder shaft pressing cover 70 (typically connected by fastener 97) is disposed on the support frame 24. A mounting position configured to allow cylinder shaft bearing 71 to be assembled is disposed between the cylinder shaft pressing cover 70 and the cylinder shaft support portion 69. The cylinder shaft bearing 71 on the cylinder shaft 93 of the plate cylinder is placed on the cylinder shaft support portion 69. The cylinder shaft support portion 69 is configured to support the cylinder shaft (and the cylinder shaft bearing 71). In addition, the cylinder shaft pressing cover 70 is configured to press the cylinder shaft bearing 71, thereby stably supporting the cylinder shaft 93 (and the cylinder shaft bearing 71), and preventing the problem of an excessive load when the cylinder shaft 93 of the whole plate cylinder is only connected and fixed by the cylinder shaft clamping opening 64 of the rotating main shaft 61. This supports the cylinder shaft better, and can be applicable to the cylinder shaft in a suspended structure. Shaft head 72 of the cylinder shaft is assembled in the cylinder shaft clamping opening 64.

[0035] Mounting hole 73 is formed in the support frame 24 to form a support sleeve structure. The rotating main shaft 61 and the clamping tightness transmission body 62 are disposed in the mounting hole 73. The rotating main shaft 61 axially penetrates into the mounting hole 73. The rotating support component 63 is disposed between the rotating main shaft 61 and the mounting hole 73. The rotating support component 63 is configured to support the rotating main shaft 61 to rotate in the mounting hole 73 of the support frame 24. The rotating support component 63 (such as the bearing) is disposed in the mounting hole 73 by backing ring 95 and end cover 96.

[0036] Rotating drive motor 74 may further be disposed on the support frame 24. The rotating drive motor 74 is in transmission connection with the rotating main shaft 61. The rotating main shaft 61 is driven by the rotating drive motor 74 to rotate. The rotating main shaft 61 drives the assembled cylinder shaft of the plate cylinder to rotate synchronously. There are numerous transmission connection structures for the rotating main shaft 61 and the rotating drive motor 74. For example, the rotating drive motor 74 is in transmission connection with transmission shaft 75. Coupling 76 is disposed between the transmission shaft 75 and the rotating main shaft 61. This facilitates the assembly and adaptation for different specifications, and achieves the relatively compact structure. The rotating drive motor 74 may be in transmission connection with a speed reducer.

[0037] Also for example, the clamping tightness transmission body 62 is a clamping sleeve. The inner clamping transmission surface 68 is located at an inner ring of the clamping sleeve. The clamping sleeve is sleeved on the rotating main shaft 61. The clamping tightness transmission body 62 is provided with the inner clamping transmission surface 68 by a full circumference (a circle), such that the clamping jaw units 65 are stressed uniformly for more synchronous clamping and loosening, the gripping force is more uniform, and the gripping effect is better. The clamping jaw units 65 are arranged circumferentially on the rotating main shaft 61 (arranged uniformly). When the cylinder shaft clamping opening 64 contracts to clamp (i.e., grips) the cylinder shaft of the plate cylinder, it applies a clamping force more uniformly, resulting in better load distribution and more balanced and stable transmission.

[0038] As a further optimization, a front portion or a rear portion of the clamping tightness transmission body 62 may further be provided with clamping jaw units 77. Separation clearances 78 are formed between the clamping jaw units 77. That is, the front portion or the rear portion of the clamping tightness transmission body 62 is divided by the separation clearances 78 into the clamping jaw units 77 along a circumferential direction. The clamping jaw units 77 define a circle. The inner clamping transmission surface 68 is located at inner sides of the clamping jaw units 77. The clamping tightness transmission body 62 is further externally connected to clamping adjustment sleeve 79. The clamping adjustment sleeve 79 is sleeved on the clamping jaw units 77. Clamping adjustment nut 80 is further connected between the clamping adjustment sleeve 79 and the clamping tightness transmission body 62. A relatively axial position of the clamping adjustment sleeve 79 is adjusted by the clamping adjustment nut 80, thereby adjusting a degree of tightness for the clamping jaw units 77 (i.e., a size of an opening defined by the clamping jaw units 77-a size of an inner ring, and also changing a size of the separation clearance 78). Hence, a degree of tightness (a size of an inner ring) for the inner clamping transmission surface 68 of the clamping tightness transmission body 62 can be adjusted, realizing different gripping forces (which can be reflected by the cylinder shaft clamping opening 64 and different opennesses loosened and clamped by and the clamping jaw units 65) of the clamping tightness transmission body 62 at a same axial movement stroke to meet requirements on openings for different cylinder shafts. An inner side of the clamping adjustment sleeve 79 and an outer side of the clamping tightness transmission body 62 may be in taper fit (for example, an inner conical surface and an outer conical surface are fitted), so as to adjust a degree of tightness for clamping.

[0039] Furthermore, the clamping tightness transmission body 62 may further be connected to axial movement transmission device 81. The axial movement transmission device 81 is configured to drive the clamping tightness transmission body 62 to axially move, ensuring that an axial position of the clamping tightness transmission body 62 is adjustable. Through axial movement of the clamping tightness transmission body 62, axial movement of the inner clamping transmission surface 68 is applied to the outer clamping transmission surface 67 of the rotating main shaft 61, and thus the clamping jaw units 65 clamp inward. When the cylinder shaft is to be released, the clamping tightness transmission body 62 retracts axially. The retraction of the clamping tightness transmission body 62 causes the inner clamping transmission surface 68 to recede from its position, allowing the clamping jaw units 65 to spread outward and return to their original positions.

[0040] There are numerous methods for the axial movement transmission device 81 to drive the clamping tightness transmission body 62. For example, the axial movement transmission device 81 includes shift fork arm 82. The shift fork arm 82 is hinged to the support frame 24 (as shown in the figure, a swing structure is formed on the support frame 24 through hinge shaft 92 to shift the clamping tightness transmission body 62 to axially move) or the shift fork arm 82 axially moves on the support frame 24 (moves in an axial sliding manner, such as a sliding rail cooperated manner). Transmission component 83 is disposed on the shift fork arm 82. Groove 84 is formed in the clamping tightness transmission body 62. The transmission component 83 is disposed in the groove 84. The shift fork arm 82 is configured to shift the clamping tightness transmission body 62 in the groove 84 through the transmission component 83 to axially move. For example, the groove 84 is an annular groove. With the annular groove, the clamping tightness transmission body 62 can rotate together with the rotating main shaft 61, and can also cooperate with the transmission component 83 smoothly for transmission. The transmission component 83 is a roller. The roller rotates in the annular groove more smoothly. The clamping tightness transmission body 62 is connected to the rotating main shaft 61. For example, the clamping tightness transmission body 62 is sleeved on the rotating main shaft 61. The clamping tightness transmission body 62 may be supported by the rotating main shaft 61, and can rotate together with the rotating main shaft 61. The transmission component 83 on the shift fork arm 82 can further be configured to drive the clamping tightness transmission body 62 in the annular groove to axially move, such that the internal structure is more compact. Typically, notches 94 configured to allow the transmission component 83 of the shift fork arm 82 to pass through and extend into the groove 84 are formed at a left side and a right side of the support frame 24 (such as the support sleeve structure). Furthermore, the axial movement transmission device 81 further includes shift fork transmission member 85. The shift fork transmission member 85 is in transmission connection with the shift fork arm 82. The shift fork arm 82 is driven by the shift fork transmission member 85 to swing or axially move on the support frame 24. The shift fork transmission member 85 includes a shift fork power source (such as a cylinder or a motor) or a shift fork handle with a locking unit (for locking a relative position of the shift fork transmission member 85).

[0041] For example, the inner clamping transmission surface 68 may be an inner conical surface, and / or, the outer clamping transmission surface 67 may be an outer conical surface. The inner clamping transmission surface 68 and the outer clamping transmission surface 67 are in taper fit for transmission. The inner conical surface and the outer conical surface each may be a conical surface of a cone, a truncated cone, or a pyramidal frustum, such as a circular conical surface or a truncated circular conical surface or a pyramidal frustum surface. The inner conical surface and / or the outer conical surface is the circular conical surface or the truncated circular conical surface, such that the machining is convenient and the operation is smoother. Certainly, the inner clamping transmission surface 68 and the outer clamping transmission surface 67 may also be fitting surfaces of other shapes.

[0042] In addition, as a further optimization, spiral groove 86 is formed in the rotating main shaft 61. The spiral groove 86 takes a central axis (i.e., a shaft axis) of the rotating main shaft 61 as a central line. Hollow cavity 87 of the rotating main shaft 61 is formed at a center of the spiral groove 86. The hollow cavity 87 communicates with an outer side of the rotating main shaft 61 through the spiral groove 86. The rotating main shaft 61 is provided with a buffering elastic structure (corresponding to the spiral groove 86) for slight position swing, realizing fine adjustment on swing. This can solve the problem of misalignment for the cylinder shaft of the plate cylinder and the rotating main shaft 61. Even in case of a certain degree of (concentricity or coaxiality) deviation, it can be compensated by the buffering elastic structure, achieving smooth assembly and transmission between the cylinder shaft and the rotating main shaft 61, and reducing the impact of vibration to ensure the printing effect. As a further optimization, support mandrel 89 may further be disposed in the hollow cavity 87 of the rotating main shaft 61. Moving clearance 90 is reserved between the support mandrel 89 and the rotating main shaft 61. The moving clearance 90 provides a swing space for the buffering elastic structure, and limits a swing range. With the moving clearance 90, when the rotating main shaft 61 passes through the spiral groove 86, the rotating main shaft 61 can slightly swing and shake, and can further be supported and protected by the support mandrel 89 to prevent breakage at the spiral groove 86. The moving clearance 90 can limit the shaking range and the swing range, and can be set as required. For example, central hole 91 is formed at the central axis of the rotating main shaft 61. A rear end of the support mandrel 89 is fixedly connected to the rotating main shaft 61. The central hole 91 includes the hollow cavity 87 (i.e., the hollow cavity 87 serves as a part of the central hole 91, and the central hole 91 may be an axial through hole). The support mandrel 89 penetrates into the central hole 91. The rear end of the support mandrel 89 may be fixedly connected to a rear end of the rotating main shaft 61.

[0043] In the printing mechanism of a printing press, the plate cylinder support device further includes first lifting seat 20, second lifting seat 21, rotating shaft 22, and swing seat 23. The support frame 24 (for example, including the support sleeve structure) is configured to mount the plate cylinder transmission device. The support frame is liftable. The plate cylinder transmission device is disposed on the support frame, and moves with the support frame.

[0044] The first lifting seat 20 is connected to the second lifting seat 21. The first lifting seat 20 can move up and down on the second lifting seat 21. One of the first lifting seat 20 and the second lifting seat 21 is in transmission connection with floating drive device 25 for vertical flotation lifting. The other of the first lifting seat 20 and the second lifting seat 21 is in transmission connection with lifting drive device 26 for vertical (for example, large-stroke) movement lifting. The first lifting seat and the second lifting seat each may be combined by connecting multiple plates.

[0045] The rotating shaft 22 is transversely disposed on the first lifting seat 20. The rotating shaft 22 moves up and down with the first lifting seat 20.

[0046] The swing seat 23 is connected to the rotating shaft 22. The swing seat 23 is supported by the rotating shaft 22 to swing. The swing seat 23 swings around the rotating shaft 22. In addition, linear sliding pair 27 is connected between the swing seat 23 and the support frame 24. The linear sliding pair 27 includes transverse sliding rail 28 and slider 29. The slider 29 is axially in sliding fit with the transverse sliding rail 28. The linear sliding pair 27 slides axially and stably. The transverse sliding rail 28 is parallel to the rotating shaft 22 that is transversely disposed. The linear sliding pair 27 and the support frame 24 move (swing and lift) with the swing seat 23. The swing seat 23 swings around the rotating shaft 22 and moves up and down with the first lifting seat 20. The support frame 24 is in transmission connection with transverse movement drive device 30. The support frame 24 is driven by the transverse movement drive device 30 to axially move. The support frame 24 is guided by the linear sliding pair 27 to axially slide on the swing seat 23. The transverse movement drive device 30 is disposed on the first lifting seat 20. The transverse movement drive device 30 also moves up and down with the first lifting seat 20. The swing seat 23 is connected to the transverse sliding rail 28 or the slider 29 in the linear sliding pair 27. The other of the transverse sliding rail 28 and the slider 29 is connected to the support frame 24.

[0047] The plate cylinder support device of the flexographic printing mechanism has the following working principle and effect: The first lifting seat 20 is connected to the second lifting seat 21. One of the first lifting seat 20 and the second lifting seat 21 performs vertical large-stroke movement lifting, and the other performs a vertical small-stroke flotation lifting. This is more practical, and makes the lifting operation more reasonable and more efficient. When the plate cylinder needs to be disengaged, it only floats upward (moves up) with a small stroke to separate from a lower structure (an anilox roller, an impression roller, and the like). When the plate cylinder is engaged, it only floats downward (moves down) with a small stroke to engage with the lower structure for printing. With the vertical large-stroke movement lifting, a larger space can be separated in assembly and replacement of the plate cylinder to facilitate operation. Upon this, the support frame 24 for mounting the plate cylinder can further be driven by the transverse movement drive device 30 to transversely move on the swing seat 23 (i.e., in axial directions of the rotating shaft 22 and the plate cylinder) for color registration, achieving a more compact structure. Therefore, the present disclosure has substantive features and progresses over the prior art.

[0048] The support frame 24 for mounting the plate cylinder is driven by the transverse movement drive device 30 to axially move on the linear sliding pair 27 for color registration, achieving a more compact structure. The swing seat 23 is disposed on the rotating shaft 22 (such as a pivot shaft). The swing seat 23 swings around the shaft axis of the rotating shaft 22, and moves up and down with the first lifting seat 20. The support frame 24 slightly swings and moves up and down with the swing seat 23. With swing of the support frame 24, the plate cylinder shaft is automatically centered. Only a plate cylinder assembly is supported on the swing seat 23, preventing an excessive load of the swing seat 23 on the rotating shaft 22.

[0049] The following optimizations or further explanations may further be made on the basis of the above embodiment.

[0050] For example, first lifting seat 20 is in transmission connection with lifting drive device 26. The lifting drive device 26 is connected to second lifting seat 21. The second lifting seat 21 is in transmission connection with floating drive device 25. That is, the first lifting seat 20 performs the vertical movement lifting. The first lifting seat 20 is disposed on the second lifting seat 21 for lifting. The second lifting seat 21 performs the vertical flotation lifting. When the second lifting seat 21 floats, the first lifting seat 20 connected to the second lifting seat 21 also floats up and down.

[0051] As a further optimization, the first lifting seat 20 is connected to a vertical guide rail, and the second lifting seat 21 is connected to a vertical guide rail, so as to facilitate stable vertical lifting. The first lifting seat 20 and the second lifting seat 21 may also share a vertical guide rail, and may also be respectively provided with vertical guide rails. For example, the second lifting seat 21 is connected to machine frame 53 through vertical guide rail 32. The first lifting seat 20 is connected to the second lifting seat 21 through vertical guide rail 31.

[0052] Also for example, the floating drive device 25 includes floating clutch actuating cylinder 33. A pressure of the floating clutch actuating cylinder 33 can be conveniently adjusted. In addition, the lifting drive device 26 includes lifting drive motor 34 and lead screw and nut mechanism 35 (including a nut and lead screw 54). The lifting drive motor 34 is in transmission connection with the lead screw and nut mechanism 35. Certainly, other manners and other transmission structures may further be used by the floating drive device 25 and the lifting drive device 26.

[0053] In addition, axial forward movement limit switch 36 and axial backward movement limit switch 37 are further disposed on the first lifting seat 20. The support frame 24 is provided with switch fitting portion 38. When the support frame 24 axially moves forward and backward on the swing seat 23, the switch fitting portion 38 axially moves (i.e., transversely moves) with the support frame 24. The switch fitting portion 38 is disposed between the axial forward movement limit switch 36 and the axial backward movement limit switch 37. The switch fitting portion 38 is configured to control, between the axial forward movement limit switch 36 and the axial backward movement limit switch 37, a front stop position and a rear stop position of a stroke in axial movement of the support frame 24. The axial forward movement limit switch 36 and the axial backward movement limit switch 37 are typically connected to transverse movement drive device 30 (through a programmable logic controller (PLC) or a controller).

[0054] For example, the transverse movement drive device 30 includes transverse movement drive motor 39, transverse lead screw 40, and drive nut 41. The drive nut 41 is fixedly disposed on the support frame 24. The drive nut 41 moves synchronously with the support frame 24. The transverse lead screw 40 is in transmission connection with the drive nut 41. The transverse movement drive motor 39 is in transmission connection with the transverse lead screw 40. The transverse movement drive motor 39 drives the transverse lead screw 40 to rotate. The transverse lead screw 40 drives the drive nut 41 to axially move. The drive nut 41 drives the support frame 24 to move back and forth along an axial direction of transverse sliding rail 28. Rotating shaft 22 may be a pivot shaft. Swing bearing 42 (such as a copper sleeve) is disposed between swing seat 23 and the pivot shaft (i.e., the rotating shaft 22). With the swing bearing 42, the swing seat 23 can swing around the pivot shaft (i.e., the rotating shaft 22) stably and smoothly. The pivot shaft is further connected to mounting frame 43 (which may include a mounting plate), which may be realized by pin connection and the like. The mounting frame 43 may be configured to allow the transverse movement drive motor 39 to be connected and supported. The transverse lead screw 40 is concentric (i.e., coaxial) with the pivot shaft. The support frame 24 may swing with the swing seat 23 (the support frame 24 drives the transverse lead screw 40 to rotate, and the transverse lead screw 40 rotates in the drive nut 41), such that the mounting frame 43, the transverse movement drive motor 39 and the like are supported by the pivot shaft and connected to the first lifting seat 20. The swing seat 23 only supports a plate cylinder assembly, preventing an excessive load on the swing seat 23.

[0055] In addition, the support frame 24 includes axial movement transmission plate 44. The drive nut 41 is connected to the axial movement transmission plate 44. The switch fitting portion 38 may be disposed on the axial movement transmission plate 44. The axial forward movement limit switch 36 and the axial backward movement limit switch 37 are disposed on the mounting frame 43. The switch fitting portion 38 is disposed between the axial forward movement limit switch 36 and the axial backward movement limit switch 37. The axial forward movement limit switch 36 and the axial backward movement limit switch 37 are connected to the transverse movement drive motor 39.

[0056] As a further optimization, spring pre-tightening device 45 is further disposed between first lifting seat 20 and swing seat 23. The swing seat 23 can abut against the first lifting seat 20 through the spring pre-tightening device 45, such that the swing seat 23 swings more stably.

[0057] For example, the spring pre-tightening device 45 includes axial bolt 46, pre-tightening nut 47, and pre-tightening spring 48. The axial bolt 46 is connected to the first lifting seat 20. Via hole 50 is formed in the swing seat 23. The axial bolt 46 passes through the via hole 50 and then is threadedly connected to the pre-tightening nut 47. The via hole 50 is provided with axial bolt play 55, such that the axial bolt 46 and the swing seat 23 shake and move relatively, ensuring that the swing seat 23 swings smoothly, preventing interference to the axial bolt 46 when the swing seat 23 swings, and ensuring accuracy in automatic centering when the swing seat 23 swings. The swing seat 23 has a very small swing angle for fine adjustment. The pre-tightening spring 48 is sleeved on the axial bolt 46. The pre-tightening spring 48 is located between the pre-tightening nut 47 and the swing seat 23. The pre-tightening spring 48 is configured to abut the swing seat 23 against the first lifting seat 20. The pre-tightening nut 47 is configured to adjust an elastic force (a pre-tightening force) of the pre-tightening spring 48 by rotating on the axial bolt 46, thereby adjusting a pressure of abutment between the swing seat 23 and the first lifting seat 20. As a further optimization, spring abutment bushing 49 is disposed on the swing seat 23. The spring abutment bushing 49 is disposed in the via hole 50. The pre-tightening spring 48 is located between the pre-tightening nut 47 and the spring abutment bushing 49 of the swing seat 23, so as to facilitate assembly, and make the pre-tightening spring 48 operate more smoothly. The spring abutment bushing 49 may serve as a part of the via hole 50, such that requirements on machining of the via hole 50 are reduced. The spring abutment bushing 49 can further protect the swing seat 23. Once a fault occurs, only the spring abutment bushing 49, but not the swing seat 23, is replaced, thereby improving the maintenance efficiency, and reducing the maintenance cost. The spring abutment bushing 49 has through hole 51. The through hole 51 is configured to allow the axial bolt 46 to pass through. The axial bolt play 55 is formed between the through hole 51 and the axial bolt 46. Spring pressing cover 52 is disposed between the pre-tightening nut 47 and the pre-tightening spring 48. With the pre-tightening nut 47, the pre-tightening spring 48 is adjusted more conveniently and more stably. One end of the pre-tightening spring 48 may be pressed and protected by the spring pressing cover 52.

Claims

1. A printing mechanism of a printing press, comprising: a plate cylinder support device and a plate cylinder transmission device, wherein the plate cylinder support device comprises a support frame (24); and the plate cylinder transmission device is disposed on the support frame (24); the plate cylinder transmission device comprises a rotating main shaft (61) and a clamping tightness transmission body (62); the rotating main shaft (61) is disposed on the support frame (24) of the plate cylinder transmission device; and a rotating support component (63) is disposed between the rotating main shaft (61) and the support frame (24); a front end of the rotating main shaft (61) is provided with a cylinder shaft clamping opening (64); clamping jaw units (65) are disposed at a periphery of the cylinder shaft clamping opening (64); separation clearances (66) are formed between the clamping jaw units (65); inner sides of the clamping jaw units (65) define the cylinder shaft clamping opening (64); and an outer clamping transmission surface (67) is disposed outside the clamping jaw units (65); and the clamping tightness transmission body (62) is provided with an inner clamping transmission surface (68); the inner clamping transmission surface (68) is disposed outside the outer clamping transmission surface (67); and the inner clamping transmission surface (68) is in transmission fit with the outer clamping transmission surface (67).

2. The printing mechanism of a printing press according to claim 1, wherein a front end of the support frame (24) is further provided with a cylinder shaft support portion (69); a cylinder shaft pressing cover (70) is further disposed above the cylinder shaft support portion (69); the cylinder shaft pressing cover (70) is disposed on the support frame (24); a mounting position configured to allow a cylinder shaft bearing (71) to be assembled is disposed between the cylinder shaft pressing cover (70) and the cylinder shaft support portion (69); and a shaft head (72) of a cylinder shaft is assembled in the cylinder shaft clamping opening (64); a mounting hole (73) is formed in the support frame (24); the rotating main shaft (61) and the clamping tightness transmission body (62) are disposed in the mounting hole (73); the rotating main shaft (61) axially penetrates into the mounting hole (73); and the rotating support component (63) is disposed between the rotating main shaft (61) and the mounting hole (73); a rotating drive motor (74) is in transmission connection with a transmission shaft (75); and a coupling (76) is disposed between the transmission shaft (75) and the rotating main shaft (61); and the rotating drive motor (74) is further disposed on the support frame (24); and the rotating drive motor (74) is in transmission connection with the rotating main shaft (61).

3. The printing mechanism of a printing press according to claim 1, wherein the clamping tightness transmission body (62) is a clamping sleeve; the inner clamping transmission surface (68) is located at an inner ring of the clamping sleeve; the clamping sleeve is sleeved on the rotating main shaft (61); and the clamping jaw units (65) are arranged circumferentially on the rotating main shaft (61); the inner clamping transmission surface (68) is an inner conical surface, and / or, the outer clamping transmission surface (67) is an outer conical surface; and the inner conical surface and / or the outer conical surface is a circular conical surface or a truncated circular conical surface.

4. The printing mechanism of a printing press according to claim 1, wherein the clamping jaw units (65) are circumferentially and uniformly arranged; a front portion or a rear portion of the clamping tightness transmission body (62) is provided with clamping jaw units (77); separation clearances (78) are formed between the clamping jaw units (77); and the inner clamping transmission surface (68) is located at inner sides of the clamping jaw units (77); the clamping tightness transmission body (62) is further externally connected to a clamping adjustment sleeve (79); and a clamping adjustment nut (80) is further connected between the clamping adjustment sleeve (79) and the clamping tightness transmission body (62); the clamping tightness transmission body (62) is in transmission connection with an axial movement transmission device (81); the axial movement transmission device (81) comprises a shift fork arm (82); the shift fork arm (82) is hinged to the support frame (24) or the shift fork arm (82) axially moves on the support frame (24); a transmission component (83) is disposed on the shift fork arm (82); a groove (84) is formed in the clamping tightness transmission body (62); and the transmission component (83) is disposed in the groove (84); the groove (84) is an annular groove; the transmission component (83) is a roller; and the clamping tightness transmission body (62) is connected to the rotating main shaft (61); and the axial movement transmission device (81) further comprises a shift fork transmission member (85); the shift fork transmission member (85) is in transmission connection with the shift fork arm (82); and the shift fork transmission member (85) comprises a shift fork power source or a shift fork handle with a locking unit.

5. The printing mechanism of a printing press according to claim 1, wherein a spiral groove (86) is formed in the rotating main shaft (61); the spiral groove (86) takes a central axis of the rotating main shaft (61) as a central line; a hollow cavity (87) of the rotating main shaft (61) is formed at a center of the spiral groove (86); and the hollow cavity (87) communicates with an outer side of the rotating main shaft (61) through the spiral groove (86).

6. The printing mechanism of a printing press according to claim 6, wherein a support mandrel (89) is disposed in the hollow cavity (87) of the rotating main shaft (61); and a moving clearance (90) is reserved between the support mandrel (89) and the rotating main shaft (61); and a central hole (91) is formed at the central axis of the rotating main shaft (61); a rear end of the support mandrel (89) is fixedly connected to the rotating main shaft (61); the central hole (91) comprises the hollow cavity (87); and the support mandrel (89) penetrates into the central hole (91).

7. The printing mechanism of a printing press according to claim 1, wherein the support frame is liftable; the plate cylinder support device further comprises a first lifting seat (20), a second lifting seat (21), a rotating shaft (22), and a swing seat (23); the first lifting seat (20) is connected to the second lifting seat (21); one of the first lifting seat (20) and the second lifting seat (21) is in transmission connection with a floating drive device (25), and the other of the first lifting seat (20) and the second lifting seat (21) is in transmission connection with a lifting drive device (26); the rotating shaft (22) is transversely disposed on the first lifting seat (20); the swing seat (23) is connected to the rotating shaft (22); a linear sliding pair (27) is connected between the swing seat (23) and the support frame (24); the linear sliding pair (27) comprises a transverse sliding rail (28) and a slider (29); and the transverse sliding rail is parallel to the rotating shaft (22); the support frame (24) is in transmission connection with a transverse movement drive device (30); and the transverse movement drive device (30) is disposed on the first lifting seat (20).

8. The printing mechanism of a printing press according to claim 6, wherein a first lifting seat (20) is in transmission connection with a lifting drive device (26); the lifting drive device (26) is connected to a second lifting seat (21); and the second lifting seat (21) is in transmission connection with a floating drive device (25).

9. The printing mechanism of a printing press according to claim 6, wherein a first lifting seat (20) is connected to a vertical guide rail; and a second lifting seat (21) is connected to a vertical guide rail; a floating drive device (25) comprises a floating clutch actuating cylinder (33); a lifting drive device (26) comprises a lifting drive motor (34) and a lead screw and nut mechanism (35); and the lifting drive motor (34) is in transmission connection with the lead screw and nut mechanism (35); a transverse movement drive device (30) comprises a transverse movement drive motor (39), a transverse lead screw (40), and a drive nut (41); the drive nut (41) is fixedly disposed on the support frame (24); the transverse lead screw (40) is in transmission connection with the drive nut (41); and the transverse movement drive motor (39) is in transmission connection with the transverse lead screw (40); a rotating shaft (22) is a pivot shaft; a swing bearing (42) is disposed between a swing seat (23) and the pivot shaft; and the pivot shaft is further connected to a mounting frame (43); the transverse movement drive motor (39) is disposed on the mounting frame (43); and the transverse lead screw (40) is concentric with the pivot shaft; and the support frame (24) comprises an axial movement transmission plate (44); and the drive nut (41) is connected to the axial movement transmission plate (44).

10. The printing mechanism of a printing press according to claim 6, wherein a spring pre-tightening device (45) is further disposed between a first lifting seat (20) and a swing seat (23); the spring pre-tightening device (45) comprises an axial bolt (46), a pre-tightening nut (47), and a pre-tightening spring (48); the axial bolt (46) is connected to the first lifting seat (20); a via hole (50) is formed in the swing seat (23); the axial bolt (46) passes through the via hole (50) and then is threadedly connected to the pre-tightening nut (47); the via hole (50) is provided with an axial bolt play (55); the pre-tightening spring (48) is sleeved on the axial bolt (46); and the pre-tightening spring (48) is located between the pre-tightening nut (47) and the swing seat (23); a spring abutment bushing (49) is disposed on the swing seat (23); the spring abutment bushing (49) is disposed in the via hole (50); and the pre-tightening spring (48) is located between the pre-tightening nut (47) and the spring abutment bushing (49) of the swing seat (23); and the spring abutment bushing (49) has a through hole (51); the through hole (51) is configured to allow the axial bolt (46) to pass through; the axial bolt play (55) is formed between the through hole (51) and the axial bolt (46); and a spring pressing cover (52) is disposed between the pre-tightening nut (47) and the pre-tightening spring (48).

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