A printing press

Abstract

The present invention relates to a printing press, wherein the cylindrical surface of the transfer cylinder in the printing mechanism of the offset printing unit is a complete circumferential surface, the processing and manufacturing cost and difficulty are reduced, and the rubber blanket is convenient to wrap, cover and paste on the cylindrical surface of the transfer cylinder, and the rubber blanket is easy to disassemble and assemble by gluing; the head end and the tail end of the rubber blanket are closed and connected, or a retraction notch is left between the head end and the tail end of the rubber blanket, and the relative positions of the head end and the tail end of the rubber blanket are different when the rubber blanket is pasted on the transfer cylinder, so that the switching between continuous printing and reciprocating printing can be realized; when reciprocating printing, the rubber blanket of matching length can be directly glued to the transfer cylinder according to the length of the unit pattern on the plate cylinder, and the transfer cylinder does not need to be replaced within a certain specification range, which is more convenient and practical. The trouble caused by frequent disassembly and replacement of the transfer cylinder for different printing methods or unit patterns of different length specifications is avoided, and the shortcomings of the transfer cylinder with grooves are overcome.

Description

Technical Field

[0001] The present invention relates to printing equipment, in particular to offset printing equipment. Background Art

[0002] In offset printing, there are continuous printing and intermittent printing, and both printing methods have their own independent equipment.

[0003] Among them, continuous printing is highly efficient and suitable for printing products with large printing volumes. However, in order to adapt to different printing unit pattern lengths, it is necessary to configure the plate cylinder and transfer cylinder corresponding to the printing unit pattern length. The configuration of the plate cylinder and transfer cylinder requires additional costs and time, and the costs are high and the time is long. If there are too many specifications for the length of the printing unit pattern, the printing cost will increase. In addition, for products with small printing volumes, the configuration of the plate cylinder and transfer cylinder requires additional costs and time, resulting in lower printing efficiency.

[0004] In addition, in intermittent printing (i.e., reciprocating printing, which is usually shorter than full-page printing), the substrate (such as paper or film) needs to be retracted during the printing process to eliminate the blank space between the unit patterns on the substrate, and the printing roller also needs to be retracted (reversed), resulting in low efficiency and high cost. In particular, the transfer roller needs to have a groove on the cylindrical surface for the substrate to retract, and a device for fixing the end of the rubber cloth is set in the groove, which greatly increases the difficulty, cost and time of processing and manufacturing the transfer roller; even different groove sizes need to be replaced according to different specifications. When the diameter of the transfer roller meets the specifications, the transfer roller has to be replaced because of the groove, and additional disassembly, replacement and assembly are required, which is troublesome, time-consuming and labor-intensive, and increases the cost of use. Summary of the invention

[0005] In view of the technical problems existing in the background technology, the technical problem solved by the present invention is to provide a printing press with relatively low cost, relatively low difficulty in processing and manufacturing the transfer roller, and a printing unit that can switch between continuous printing and reciprocating printing.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a printing machine, including at least one offset printing unit, characterized in that: the offset printing unit includes a printing mechanism, the printing mechanism includes a frame, the frame is provided with a plate cylinder, a transfer cylinder and a printing cylinder, the transfer cylinder is arranged between the plate cylinder and the printing cylinder, and a rubber cloth is provided outside the cylindrical surface of the transfer cylinder, characterized in that: the cylindrical surface of the transfer cylinder is a complete circle of circumferential surface, the rubber cloth is wrapped around and pasted on the cylindrical surface of the transfer cylinder, the thickness of the rubber cloth and the radius of the transfer cylinder add up to match the radius of the plate cylinder; the head end and the tail end of the rubber cloth are closed and connected, or a retraction gap is left between the head end and the tail end of the rubber cloth; the printing mechanisms in each offset printing unit are switched to continuous printing or switched to reciprocating printing.

[0007] The following various optimizations or supplementary explanations can be made on the above technical solutions respectively.

[0008] For example, two or more offset printing units are arranged in series.

[0009] For example, the frame includes a first bracket and a second bracket, the first bracket is located in front of the second bracket, and at least one of the first bracket and the second bracket is arranged to be adjusted to shift forward and backward; the plate cylinder and the transfer cylinder are connected to the first bracket, and the printing cylinder is connected to the second bracket.

[0010] In addition, a supporting swing arm is also provided on the first bracket, the transfer roller is arranged on the supporting swing arm, and the printing plate roller is arranged on the first bracket.

[0011] For example, the first bracket is arranged on a guide rail running forward and backward, the second bracket is fixedly arranged, the frame also includes a fixed seat, the guide rail is connected to the fixed seat, the second bracket is fixedly connected to the fixed seat, a first cylinder driving device is connected between the first bracket and the second bracket or the fixed seat of the frame; a second cylinder driving device is connected between the support swing arm and the fixed seat of the frame or the first bracket or the second bracket.

[0012] For example, the first cylinder driving device includes a first double-stroke cylinder or a first double-cylinder group; the second cylinder driving device includes a second double-stroke cylinder or a second double-cylinder group; the first cylinder driving device has a large stroke and a small stroke, and the second cylinder driving device has a large stroke and a small stroke.

[0013] For example, the first cylinder driving device is connected between the first bracket and the second bracket, and the first bracket and the second bracket are respectively provided with a first hinge shaft connected to the first cylinder driving device; the second cylinder driving device is connected between the supporting swing arm and the second bracket, and the supporting swing arm and the second bracket are respectively provided with a second hinge shaft connected to the second cylinder driving device; the second bracket is also provided with a swing arm limit adjustment push rod; the swing arm limit adjustment push rod is transmission-connected with the telescopic driving device; the supporting swing arms are respectively arranged on the left and right sides of the first bracket, and the left and / or right sides of the second bracket are also provided with a rotating plate for setting the second hinge shaft, and the rotating plate is also equipped with a rotating driving device; the rotating driving device includes a rotating driving cylinder, and the second bracket is provided with a rotating limit portion that cooperates with the rotating plate for limiting.

[0014] In addition, a floating seat is provided on the second bracket, and a first roller and a second roller are provided on the floating seat. The input end between the transfer roller and the printing roller is connected to the first roller, and the output end between the transfer roller and the printing roller is connected to the second roller.

[0015] The second bracket is also provided with a first material guide roller and a second material guide roller. The input end between the transfer roller and the printing roller is connected with the first roller through the first material guide roller, and the output end between the transfer roller and the printing roller is connected with the second roller through the second material guide roller.

[0016] The printing plate cylinder is equipped with a first motor, the transfer cylinder is equipped with a second motor, and the printing cylinder is equipped with a third motor.

[0017] When the head end and the tail end of the rubber blanket are closed and connected, the printing state is switched to a continuous printing state.

[0018] Wherein, when a retraction gap is left between the head end and the tail end of the rubber cloth, the rubber cloth is switched to the reciprocating printing state.

[0019] The beneficial effects of the present invention are as follows: in the printing mechanism of the printing unit of the printing machine, the cylindrical surface of the transfer roller adopts a complete circle of circumferential surface, which reduces the processing cost and difficulty. The complete circle of circumferential surface is convenient for the rubber cloth to be wrapped and glued on it for connection, and the gluing method is convenient for disassembly and assembly of the rubber cloth; and the relative positions of the head end and the tail end of the rubber cloth attached to the transfer roller are different, which can realize the switching between continuous printing and reciprocating printing; when reciprocating printing, the rubber cloth of matching length selected according to the length of the unit pattern on the plate roller can be directly glued to the transfer roller, and the transfer roller does not need to be replaced within a certain specification range, which is more convenient and practical. It avoids the trouble caused by frequent disassembly and replacement of the transfer roller for different printing methods or unit patterns of different length specifications, and overcomes the shortcomings of the transfer roller with grooves. Therefore, compared with the prior art, the present invention has outstanding substantial characteristics and significant progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following describes the relevant details and working principles of the implementation mode and embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 It is a side view of the first embodiment of the printing mechanism in the present invention, wherein the head end and the tail end of the rubber blanket are closed and connected, which is a continuous printing state, and the printing material continues to move forward.

[0022] Figure 2 for Figure 2 A is an enlarged view of the middle image.

[0023] Figure 3 It is a side view of the second embodiment of the printing mechanism in the present invention; wherein a retraction notch is left between the head end and the tail end of the rubber cloth, which is in a reciprocating printing state, and the substrate retracts intermittently during the operation; in the figure, the printing roller is reversed, and the substrate on the printing roller is in a retraction state, and the retraction notch faces the printing roller to allow the substrate to retract.

[0024] Figure 4 for Figure 3 Enlarged view of B.

[0025] Figure 5 for Figure 4 Schematic diagram of the structure in which the printing roller switches to forward rotation; wherein the transfer roller continues to run, the printing roller rotates forward, and the substrate moves forward.

[0026] Figure 6 for Figure 5 Enlarged view of C in the middle.

[0027] Figure 7 It is a right schematic diagram of the offset printing unit in the present invention.

[0028] Figure 8 for Figure 7 Schematic diagram of the other side (left side) of the offset printing unit.

[0029] Fig. 9 This is a schematic diagram of the serial structure of the printing units in Example 1.

[0030] Fig.10 This is a schematic diagram of the serial structure of the printing units in Example 2.

[0031] In the figure: 1. printing roller; 2. transfer roller; 3. plate roller; 4. frame; 51. first guide roller; 52. second guide roller; 6. dampening system; 7. ink supply system; 9. rubber cloth; 10. first bracket; 11. floating seat; 12. second bracket; 13. support swing arm; 14. first roller; 15. second roller; 16. seam; 17. retraction notch; 30. printing material; 91. rubber cloth head end; 92. rubber cloth tail end; 33. fixed seat; 34. first cylinder drive device; 35. second cylinder drive device; 36. first hinge shaft; 37. second hinge shaft; 38. swing arm limit adjustment top rod; 39. rotating plate; 40. rotating drive device; 41. guide rail; 42. rotating limit part; 51. first guide roller; 52. second guide roller. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the implementation mode of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0033] Referring to the accompanying drawings, in an example of the present embodiment, a printing press includes at least one offset printing unit, wherein each offset printing unit includes a printing mechanism, and the printing mechanisms in each offset printing unit are switched to continuous printing or to reciprocating printing, so that the printing press can achieve continuous printing or reciprocating printing. Usually, two or more offset printing units are arranged in series, and other units can also be additionally connected in series. For example, traction mechanisms (including traction rollers driven by power motors, etc.) are respectively arranged before and after the offset printing units connected in series.

[0034] Referring to the accompanying drawings, in the embodiment of the present embodiment, the printing mechanism of the offset printing group of the printing press includes a frame 4, on which a plate cylinder 3, a transfer cylinder 2 and a printing cylinder 1 are arranged; the transfer cylinder 2 is arranged between the plate cylinder 3 and the printing cylinder 1, and a rubber cloth 9 is arranged outside the cylindrical surface of the transfer cylinder 2; wherein the plate cylinder 3, the transfer cylinder 2 and the printing cylinder 1 cooperate to realize offset printing; when printing, the plate cylinder 3 and the transfer cylinder 2 cooperate to roll against each other, and cooperate to transfer the plate pattern on the plate cylinder 3 to the rubber cloth 9 of the transfer cylinder 2, and the transfer cylinder 2 and the printing cylinder 1 cooperate to roll against each other, and cooperate to transfer the pattern on the rubber cloth 9 of the transfer cylinder 2 to the substrate 30 (generally a rolled paper or film, etc.) between the transfer cylinder 2 and the printing cylinder 1.

[0035] Among them, the cylindrical surface of the transfer roller 2 is a complete circumferential surface, that is, the cylindrical surface of the transfer roller 2 is a full circumferential surface without grooves, and its processing and manufacturing is simpler, the production cycle is shorter, the difficulty is less, and the subsequent use is not affected by the size and specifications of the grooves.

[0036] Among them, the rubber cloth 9 will be wrapped around and pasted on the cylindrical surface of the transfer roller 2, that is, the rubber cloth 9 will be wrapped around and pasted on the cylindrical surface of the transfer roller 2, and the rubber cloth and the cylindrical surface of the transfer roller will be connected and fixed by gluing (such as the rubber cloth has its own glue or is glued and fixed with glue), which makes it convenient to disassemble and install the rubber cloth 9 on the cylindrical surface of the transfer roller 2, without the need for additional fixing devices (such as clamps, etc.) for fixing, and there is no need to set a groove on the cylindrical surface of the transfer roller 2 for the fixing device to be set.

[0037] The thickness of the rubber blanket 9 and the radius of the transfer cylinder 2 are added together (the sum) to match the radius of the plate cylinder 3, that is, the radius value (R1) of the plate cylinder 3 matches the value (D+R2) of the sum of the thickness of the rubber blanket 9 and the radius of the transfer cylinder 2. Usually, the value (R1) is the same or similar (slightly deviated) to the value (D+R2), or the cylinder circumference of the plate cylinder 3 and the cylinder circumference of the transfer cylinder 2 are the same or similar (slightly deviated) when the rubber blanket is closed head and tail (the head end and the tail end are closed), or are integer multiples of each other (slightly deviated), but there will be slight deviations due to the influence of processing and assembly precision, and they can also be matched within the error range. Ensure that the unit pattern on the plate cylinder 3 can be smoothly transferred to the same position of the rubber blanket 9 of the transfer cylinder 2 every time, and the pattern is not easy to be misplaced.

[0038] The rubber blanket 9 is wound, covered and pasted on the cylindrical surface of the transfer roller 2. In this embodiment, the relative positions of the head end 91 and the tail end 92 of the rubber blanket 9 on the transfer roller 2 are different to realize the switching between continuous printing and reciprocating printing. The head end 91 and the tail end 92 of the rubber blanket 9 are closed and connected, and the head end 91 and the tail end 92 of the pasted and wound rubber blanket 9 are connected. The head end 91 and the tail end 92 of the rubber blanket 9 are, and the seam 16 between the head end 91 and the tail end 92 can be very small so that the head end 91 and the tail end 92 are almost against each other. At this time, the structure of the rubber blanket 9 pasted on the transfer roller 2 is used for continuous printing. Alternatively, a retraction notch 17 is left between the head end 91 and the tail end 92 of the rubber blanket 9, and the head end 91 and the tail end 92 of the rubber blanket 9 that is pasted in a circle (not a full circle) are separated by a certain distance, and the distance forms the retraction notch 17, and the retraction notch 17 is for the substrate 30 to retract. When the retraction notch 17 is opposite to the printing cylinder 1, the substrate 30 between the transfer cylinder 2 and the printing cylinder 1 will not be pressed and can be smoothly retracted. At this time, the structure of the rubber blanket 9 attached to the transfer cylinder 2 is used for reciprocating printing; in addition, the rubber blanket 9 of a matching length selected according to the length of the unit pattern on the plate cylinder 3 can be directly glued to the transfer cylinder 2, and the transfer cylinder 2 does not need to be replaced within a certain specification range. The relative positions of the head end 91 and the tail end 92 of the rubber blanket 9 are different, so as to realize the switching between continuous printing and reciprocating printing.

[0039] Its working principle is as follows: in the printing mechanism of the printing machine, the cylindrical surface of the transfer roller 2 adopts a complete circle (full circle) of the circumference, and the transfer roller 2 of the full circle of the circumference is covered with a rubber blanket 9 with adhesive; when the rubber blanket 9 is wrapped and pasted on the cylindrical surface of the transfer roller 2, the relative positions of the head end 91 and the tail end 92 of the rubber blanket 9 are different to realize the switching between continuous printing and reciprocating printing. Among them, the head end 91 and the tail end 92 of the rubber blanket 9 are closed and connected for continuous printing. Among them, a retraction gap 17 is left between the head end 91 and the tail end 92 of the rubber blanket 9, which can be used for reciprocating printing. After the rubber blanket 9 is glued to the cylindrical surface of the transfer roller 2, the relative positions of the head end 91 and the tail end 92 of the rubber blanket 9 are different, realizing the switching between continuous printing and reciprocating printing. It can meet the needs of efficient printing of large-scale printing orders and efficient printing of small-scale printing orders.

[0040] The printing mechanism for switching between continuous printing and reciprocating printing is adopted in the printing machine, wherein the cylindrical surface of the transfer roller 2 adopts a complete circle of circumferential surface, which reduces the processing cost and difficulty. The complete circle of circumferential surface is convenient for the rubber blanket 9 to be wrapped and glued on it for connection. The rubber blanket 9 is easy to disassemble and assemble by gluing, and no rubber blanket fixing device is required; and the relative positions of the head end 91 and the tail end 92 of the rubber blanket 9 attached to the transfer roller 2 are different, which can realize the switching between continuous printing and reciprocating printing; when reciprocating printing, the rubber blanket 9 of matching length can be directly glued to the transfer roller 2 according to the length of the unit pattern on the plate roller 3, and the transfer roller 2 does not need to be replaced within a certain specification range, which is more convenient and practical. It avoids the trouble caused by frequent disassembly and replacement of the transfer roller 2 for different printing methods or unit patterns of different length specifications, and overcomes the shortcomings of the transfer roller 2 with grooves for installing the rubber blanket 9 and for printing retreat.

[0041] The following optimization or further explanation may be performed based on the above embodiments.

[0042] When the leading end 91 and the trailing end 92 of the rubber blanket 9 are closed and connected, the printing state is switched to a continuous printing state.

[0043] When a retraction gap 17 is left between the head end 91 and the tail end 92 of the rubber blanket 9 , the printing state is switched to the reciprocating printing state, and the rubber blanket 9 does not completely go around the transfer roller 2 in one full circle.

[0044] For example, the plate cylinder 3 is equipped with a first motor, which drives the plate cylinder 3 to rotate, the transfer cylinder 2 is equipped with a second motor, which drives the transfer cylinder 2 to rotate, and the printing cylinder 1 is equipped with a third motor, which drives the printing cylinder 1 to rotate. Of course, a common motor linkage can be used. The printing cylinder 1 can also be equipped with a curing device 23 (such as a UV curing device).

[0045] Further optimization, the frame 4 includes a first bracket 10 and a second bracket 12, the first bracket 10 is located at the front side of the second bracket 12, at least one of the first bracket 10 and the second bracket 12 is set to be adjusted forward and backward, and the first bracket 10 and the second bracket 12 can be separated and closed by adjusting the forward and backward movement positions, the plate cylinder 3 and the transfer cylinder 2 are connected to the first bracket 10, and the printing cylinder 1 is connected to the second bracket 12. By separating the first bracket 10 from the second bracket 12, the printing cylinder 1 can be separated relative to the transfer cylinder 2 so as to be separated without contact (off-pressure state) or to free up space for convenient loading and unloading of parts, such as pasting the rubber cloth 9, such as disassembling and assembling the transfer cylinder 2, etc.; when the first bracket 10 and the second bracket 12 are closed, the printing cylinder 1 is brought close to the transfer cylinder 2 (closed pressure state) for printing. For example, in the figure, the first bracket 10 is set to be adjusted for forward and backward displacement, the second bracket 12 is fixedly set, the frame 4 also includes a fixed seat 33 (such as a base), the guide rail 41 is connected to the fixed seat 33, the second bracket 12 is fixedly connected to the fixed seat 33, and the second bracket 10 is arranged on the guide rail 41 (the guide rail 41 is arranged to run forward and backward so that the first bracket 10 can move forward and backward) for smooth and stable forward and backward displacement adjustment; the second bracket 12 is fixedly set, and the relative position of the rotation axis of the printing roller 1 on the second bracket 12 remains unchanged. When the substrate 30 is wound on the second bracket 12 and the printing roller 1, the substrate 30 will not be affected by the forward and backward displacement of the first bracket 10, thereby avoiding problems such as loose substrate 30.

[0046] It can be further optimized that the first bracket 10 is further provided with a support swing arm 13, the transfer roller 2 is arranged on the support swing arm 13, and the printing plate roller 3 is arranged on the first bracket 10. The support swing arm 13 is rotated (swinged) to adjust the position of the first bracket 10, and the downward swing facilitates the replacement of the transfer roller 2 with different diameter specifications. The replaced transfer roller 2 is swung upward with the support swing arm 13 to be close to the printing plate roller 3 for printing. The structure is easy to operate and can meet the requirements of pressing different diameter specifications.

[0047] In addition, the front-to-back displacement adjustment of the first bracket 10 can be driven by a driving power (such as a cylinder or a motor, etc.); for example, a first cylinder driving device 34 is connected between the first bracket 10 and the second bracket 12 or the fixed seat 33 of the frame, and the first cylinder driving device 34 drives the first bracket 10 to shift (move) forward and backward. The first cylinder driving device 34 can use a single cylinder; it can also use a first double-stroke cylinder or a first double-cylinder group. The first double-stroke cylinder or the first double-cylinder group can make the first cylinder driving device have a large stroke and a small stroke, wherein the large stroke can drive the first bracket to the position, and the small stroke can make the first bracket relatively move in a small distance, so that the printing plate cylinder and the transfer cylinder can be clutched, which is relatively more practical. When the printing is suspended, only a small stroke is required. When the specifications of the printing plate sleeve need to be adjusted or replaced, the large stroke can be used for coordination.

[0048] Similarly, the swing adjustment position of the support swing arm 13 can be driven by a driving power (such as a cylinder or a motor, etc.) to swing; for example, a second cylinder driving device 35 is connected between the support swing arm 13 and the fixed seat 33 of the frame 4 or the first bracket 10 or the second bracket 12, and the second cylinder driving device 35 drives the support swing arm 13 to swing and rotate. The second cylinder driving device 35 can use a single cylinder; or a second double-stroke cylinder or a second double-cylinder group, the second double-stroke cylinder or the second double-cylinder group can make the second cylinder driving device 35 have a large stroke and a small stroke, wherein the large stroke can drive the support swing arm 13 to the right position, and the small stroke can make the support swing arm 13 relatively swing to a small angle of clutch movement, which can make the transfer roller 2 and the printing roller 1 clutch, which is relatively more practical. When the printing is suspended, only a small stroke operation is required, and when the specifications of the printing plate sleeve need to be adjusted or replaced, the large stroke can be used for coordination operation.

[0049] For example, in the figure, the first cylinder drive device 34 is connected between the first bracket 10 and the second bracket 12, and the first bracket 10 and the second bracket 12 are respectively provided with a first hinge shaft 36, which is connected to the first cylinder drive device 34 through the first hinge shaft 36; the second cylinder drive device 35 is connected between the supporting swing arm 13 and the second bracket 12, and the supporting swing arm 13 and the second bracket 12 are respectively provided with a second hinge shaft 37, which is connected to the second cylinder drive device 35 through the second hinge shaft 37, and is connected through the corresponding hinge shafts so that they can rotate relative to each other during the transmission process; the first cylinder drive device 34 has a large stroke and a small stroke, and the second cylinder drive device 35 has a large stroke and a small stroke, and the double-stroke structure is more practical. Moreover, when the first cylinder driving device 34 drives the first bracket 10 to move closer to the second bracket 12, the plate roller 3 on the first bracket 10 can move closer to the transfer roller 2; when the second cylinder driving device 35 drives the supporting swing arm 13 to move closer to the second bracket 12, the transfer roller 2 on the supporting swing arm 13 moves closer to the printing roller 1; the forces of the first cylinder driving device 34 and the second cylinder driving device 35 will not offset each other, and the structural layout is more reasonable.

[0050] In addition, the second bracket 12 is also provided with a swing arm limit adjustment push rod 38, which is used to limit and hold the support swing arm 13 that swings close to (leans toward) the second bracket 12, and by limiting and holding the support swing arm 13, the pressure between the transfer roller 2 and the printing roller 1 can be controlled. The swing arm limit adjustment push rod 38 can also be connected to a telescopic drive device 43, and the (axial) relative position of the swing arm limit adjustment push rod 38 can be driven by the telescopic drive device 43, so that the relative position of the support swing arm 13 leaning against the second bracket 12 can be adjusted to achieve the adjustment of the pressure. The telescopic drive device 43 can be powered by manual or motor, and the telescopic drive device 43 can be a structure including a screw nut mechanism (including a screw and a nut, etc.) or a worm gear mechanism (including a worm gear and a worm, etc.).

[0051] In addition, the support swing arm 13 is respectively arranged on the left and right sides of the first bracket 10, and a rotating plate 39 for setting the second hinge shaft 37 is also arranged on the left and / or right sides of the second bracket 12. In the figure, a rotating plate 39 is arranged on the right side of the second bracket 12 for setting the second hinge shaft 37. The support swing arm 13 can be connected to the second bracket 12 through the second hinge shaft 37 on the rotating plate 39. The rotating plate 39 can be rotated to switch positions. When the transfer roller 2 on the support swing arm 13 needs to be replaced, one of the rotating plates 39 can be rotated, and the support swing arm 13 on the left or right side of the first bracket 10 is driven to swing, so that the support swing arms 13 on the left and right sides of the first bracket 10 can be driven to stagger mutually, so as to facilitate the axial movement of the transfer roller 2 for replacement and loading and unloading. The rotating plate 39 is also equipped with a rotating drive device 40, which drives the rotating plate 39 to rotate and switch positions through the rotating drive device 40. The rotating drive device 40 can use a cylinder, a motor, or manual as a power source. In the figure, the rotation driving device 40 includes a rotation driving cylinder, and a rotation limiting portion 42 is provided on the second bracket 12. The rotation limiting portion 42 cooperates with the rotation plate 39 to limit the rotation plate 39 so that the rotation plate 39 is limited when it is rotated into position, and the support swing arm 13 can be driven to return (rotate) accurately into position through the limitation; the rotation limiting portion 42 can adopt a limit block, a limit rod, etc., and the rotation driving cylinder can be installed on the second bracket 12, and the rotation driving cylinder is connected to the rotation plate 39 by transmission.

[0052] In addition, the second bracket 12 is further provided with a floating seat 11, which is usually moved back and forth in a straight line to adjust the floating position. Of course, it can also move back and forth in an arc track to adjust the floating position (such as in the form of a floating swing arm). The floating adjustment of the floating seat 11 can be driven by a power (such as a motor or cylinder) or manually driven. The floating seat 11 is provided with a first roller 14 and a second roller 15. The input end between the transfer roller 2 and the printing roller 1 is connected to the first roller 14, that is, the substrate 30 enters the input end (between the transfer roller 2 and the printing roller 1) after winding around the first roller 14; the output end between the transfer roller 2 and the printing roller 1 is connected to the second roller 15, that is, the substrate 30 comes out from the output end (between the transfer roller 2 and the printing roller 1) and then winds around the second roller 15. The substrate 30 enters between the transfer roller 2 and the printing roller 1 from the input end, and is output from the output end after being printed between the transfer roller 2 and the printing roller 1. By coordinating the floating movement adjustment of the floating seat 11 and the first roller 14 and the second roller 15 thereon, the relative position of the printing material 30 (including the front and back of its printed pattern) on the printing roller 1 can be adjusted, so as to solve the problem of misalignment and registration of the patterns of the multi-color printing units during the printing process, and the plate setting is relatively more accurate.

[0053] As an additional optimization, the second bracket 12 is also provided with a first guide roller 51 and a second guide roller 52. The input end between the transfer roller 2 and the printing roller 1 is connected to the first roller 14 through the first guide roller 51, and the output end between the transfer roller 2 and the printing roller 1 is connected to the second roller 15 through the second guide roller 52. The substrate 30 is guided by the first guide roller 51 and the second guide roller 52 during the winding process, so that the substrate 30 can be smoothly arranged and wound. The number of the first guide roller 51 and the second guide roller 52 can be set according to demand. The frame 4 (such as the first bracket 10) can be provided with a dampening system 6 and an ink supply system 7 to cooperate with the plate cylinder 3.

Claims

1. A printing press, comprising at least one offset printing unit, characterized in that: The offset printing unit comprises a printing mechanism, the printing mechanism comprises a frame (4), a printing plate cylinder (3), a transfer cylinder (2) and a printing cylinder (1) are arranged on the frame (4), the transfer cylinder (2) is arranged between the printing plate cylinder (3) and the printing cylinder (1), and a rubber cloth (9) is arranged outside the cylindrical surface of the transfer cylinder (2), and is characterized in that: The printing press uses a printing mechanism that switches between continuous printing and reciprocating printing. The cylindrical surface of the transfer roller (2) is a complete circumferential surface, and the rubber cloth (9) is wrapped around and adhered to the cylindrical surface of the transfer roller (2). The thickness of the rubber cloth (9) and the radius of the transfer cylinder (2) are added together to match the radius of the plate cylinder (3); The head end (91) and the tail end (92) of the rubber cloth (9) are closed and connected, or a retraction gap (17) is left between the head end (91) and the tail end (92) of the rubber cloth (9); When the rubber cloth (9) is wrapped around and pasted on the cylindrical surface of the transfer roller (2), the relative positions of the head end (91) and the tail end (92) of the rubber cloth (9) are different, so as to realize the switching between continuous printing and reciprocating printing, wherein the head end (91) and the tail end (92) of the rubber cloth (9) are closed and connected, so as to be used for continuous printing; wherein a retraction gap (17) is left between the head end (91) and the tail end (92) of the rubber cloth (9), so as to be used for reciprocating printing; after the rubber cloth 9 is pasted on the cylindrical surface of the transfer roller (2), the relative positions of the head end (91) and the tail end (92) of the rubber cloth (9) are different, so as to realize the switching between continuous printing and reciprocating printing; The printing mechanisms in each offset printing unit are switched to continuous printing or to reciprocating printing.

2. A printing press according to claim 1, characterized in that: Two or more offset printing units are arranged in series.

3. A printing press according to claim 1, characterized in that: The frame (4) comprises a first bracket (10) and a second bracket (12), the first bracket (10) being located in front of the second bracket (12), and at least one of the first bracket (10) and the second bracket (12) being arranged to be adjustable in forward and backward displacement; The printing plate cylinder (3) and the transfer cylinder (2) are connected to the first bracket (10), and the printing cylinder (1) is connected to the second bracket (12).

4. A printing press according to claim 3, characterized in that: A supporting swing arm (13) is also provided on the first bracket (10), the transfer roller (2) is arranged on the supporting swing arm (13), and the printing plate roller (3) is arranged on the first bracket (10).

5. A printing press according to claim 4, characterized in that: The first bracket (10) is arranged on a guide rail (41) extending forward and backward, and the second bracket (12) is fixedly arranged. The frame (4) further comprises a fixed seat (33), the guide rail (41) is connected to the fixed seat (33), and the second bracket (12) is fixedly connected to the fixed seat (33). A first cylinder driving device (34) is connected between the first bracket (10) and the second bracket (12) or the fixing seat (33) of the frame (4); A second cylinder driving device (35) is connected between the supporting swing arm (13) and the fixing seat (33) of the frame (4) or the first bracket (10) or the second bracket (12).

6. A printing press according to claim 5, characterized in that: The first cylinder driving device (34) comprises a first double-stroke cylinder or a first double-cylinder group; The second cylinder driving device (35) comprises a second double-stroke cylinder or a second double-cylinder group; The first cylinder drive device (34) has a large stroke and a small stroke, and the second cylinder drive device (35) has a large stroke and a small stroke.

7. A printing press according to claim 1, characterized in that: The frame (4) comprises a first bracket (10) and a second bracket (12), the first bracket (10) being located in front of the second bracket (12), and the first bracket (10) being arranged to be adjustable in forward and backward displacement; A support swing arm (13) is also provided on the first bracket (10), the transfer roller (2) is arranged on the support swing arm (13), and the printing plate roller (3) is arranged on the first bracket (10); The second bracket (12) is fixedly arranged. The first cylinder drive device (34) is connected between the first bracket (10) and the second bracket (12); the first bracket (10) and the second bracket (12) are respectively provided with a first hinge shaft (36) connected to the first cylinder drive device (34); The second cylinder driving device (35) is connected between the supporting swing arm (13) and the second bracket (12); the supporting swing arm (13) and the second bracket (12) are respectively provided with a second hinge shaft (37) connected to the second cylinder driving device (35); The support swing arms (13) are respectively arranged on the left and right sides of the first bracket (10), and a rotating plate (39) for setting the second hinge shaft (37) is also arranged on the left and / or right sides of the second bracket (12), and the rotating plate (39) is also equipped with a rotating drive device (40).

8. A printing press according to claim 7, characterized in that: The second bracket (12) is also provided with a swing arm limit adjustment push rod (38); the swing arm limit adjustment push rod (38) is transmission-connected to a telescopic drive device; the rotation drive device (40) comprises a rotation drive cylinder, and the second bracket (12) is provided with a rotation limit portion (42) that cooperates with the rotation plate (39) for limiting the position.

9. A printing press according to claim 3, characterized in that: The second bracket (12) is also provided with a floating seat (11), and the floating seat (11) is provided with a first roller (14) and a second roller (15); the input end between the transfer roller (2) and the printing roller (1) is connected to the first roller (14), and the output end between the transfer roller (2) and the printing roller (1) is connected to the second roller (15); The second bracket (12) is also provided with a first material guide roller (51) and a second material guide roller (52); the input end between the transfer roller (2) and the printing roller (1) is connected to the first roller (14) via the first material guide roller (51); and the output end between the transfer roller (2) and the printing roller (1) is connected to the second roller (15) via the second material guide roller (52); The printing plate cylinder (3) is equipped with a first motor, the transfer cylinder (2) is equipped with a second motor, and the printing cylinder (1) is equipped with a third motor.

10. A printing press according to claim 1, characterized in that: When the head end (91) and the tail end (92) of the rubber cloth (9) are closed and connected, the rubber cloth (9) switches to a continuous printing state.

11. A printing press according to claim 1, characterized in that: When a retraction gap (17) is left between the head end (91) and the tail end (92) of the rubber cloth (9), the printing state is switched to a reciprocating printing state.

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