Double-face opposite printing synchronous printing device and using method thereof

Abstract

The invention discloses a double-face opposite-printing synchronous printing device and a using method thereof, and relates to the technical field of printing devices.The double-face opposite-printing synchronous printing device comprises a mounting frame, and a second tension adjusting mechanism is arranged between the mounting frame and an impressing roller; the second tension adjusting mechanism comprises a plurality of friction blocks, the friction blocks are slidably connected in the axial direction of the impressing roller, the friction blocks form a circular ring structure with the axis of the impressing roller as the circle center, and the outer diameter of the circular ring structure is the same as the diameter of the impressing roller; the spring is arranged between the impressing roller and the friction block; and the cam disc is arranged on the mounting frame, and the cam disc abuts against the friction block. By arranging the second tension adjusting mechanism, the tension in the width direction of the film is controlled in time in the printing process, so that the tension change in the width direction generated during printing is counteracted, and the generation of printing wrinkles is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of printing devices, and in particular to a double-sided printing synchronous printing device and a use method thereof. Background Art

[0002] The double-sided printing process is a highly effective anti-counterfeiting printing technology. Because it is difficult to counterfeit and easy to be identified by the public, it is widely used in printed materials with high anti-counterfeiting requirements such as banknotes and securities. Especially engraved gravure printing, because its pattern has a strong three-dimensional sense and the process is complex, it greatly increases the difficulty of counterfeiting, so it is widely used in banknote printing.

[0003] In modern printing technology for products with high anti-counterfeiting requirements, such as banknotes and certificates, most of them use roll-to-roll transmission for gravure printing; this printing method achieves efficient and high-quality printing through a continuous roll structure, which not only ensures the fineness and three-dimensional effect of the pattern, but also greatly improves production efficiency and anti-counterfeiting performance.

[0004] However, the gravure printing of the roll structure still has the following defects during use: When using gravure printing technology for film printing, since the film needs to withstand a large tension during the tensioning and conveying process, this places high demands on the tension control of the film; if the tension of the film is difficult to accurately control, it is easy to cause the film to deform during the printing process, and this deformation is often difficult to completely recover, resulting in wrinkles in the film; In addition, during the gravure printing process, the film will be pulled in the width direction, further aggravating the formation of wrinkles; when the film is printed, if there is a lack of effective tension control in the width direction of the film during the transportation process, the film will continue to be conveyed in a wrinkled state, resulting in obvious creases on the printed product, seriously affecting product quality. Summary of the invention

[0005] In order to overcome the above technical problems, the purpose of the present invention is to provide a double-sided printing synchronous printing device and its use method, which is used to solve the problem that the existing winding and conveying printing method mentioned in the above background technology is prone to wrinkles that affect product quality.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A double-sided synchronous printing device comprises a mounting frame, on which a conveying mechanism and a printing mechanism are arranged; the printing mechanism comprises an embossing roller rotatably connected to the mounting frame, and a film is tensioned on the embossing roller; a second tension adjustment mechanism is arranged between the mounting frame and the embossing roller; the second tension adjustment mechanism comprises: A plurality of friction blocks, wherein the plurality of friction blocks are slidably connected along the axial direction of the embossing roller, and the plurality of friction blocks form a circular ring structure with the axis of the embossing roller as the center, and the outer diameter of the circular ring structure is the same as the diameter of the embossing roller; A spring, wherein the spring is arranged between the embossing roller and the friction block; and a cam plate, wherein the cam plate is arranged on the mounting frame and the cam plate is in conflict with the friction block; The cam plate includes a first protrusion and a recessed portion, which are connected end to end; when the friction block moves from a position in conflict with the first protrusion to a position in conflict with the recessed portion, the friction block is pushed away from the center position of the embossing roller by the spring.

[0007] Preferably, the second tension adjustment mechanism further comprises a supporting mechanism; when the friction block moves away from the center position of the embossing roller, the supporting mechanism is used to fill the gap between the friction block and the embossing roller.

[0008] Preferably, the support mechanism includes a linkage mechanism, a plurality of support plates and a connecting rod; adjacent support plates are rotatably connected via a connecting rod, and one of the support plates is rotatably connected to the friction block; the linkage mechanism is arranged between the friction block and the embossing roller; when the friction block moves away from the center position of the embossing roller, the plurality of support plates are driven to rotate and flatten through the linkage mechanism to fill the gap between the friction block and the embossing roller.

[0009] Preferably, the linkage mechanism includes a connecting shaft, a push block, an airbag, a plurality of connecting tubes and a telescopic tube; one end of the connecting shaft is connected to the embossing roller, the other end of the connecting shaft is inserted into the friction block, and the axis of the connecting shaft is parallel to the axis of the embossing roller, the push block is arranged at the other end of the connecting shaft, the airbag is arranged between the friction block and the push block, a plurality of connecting tubes are arranged in the friction block, one end of the plurality of connecting tubes are connected to the airbag, the other ends of the plurality of connecting tubes are respectively connected to a plurality of telescopic tubes, and the plurality of telescopic tubes are connected to a plurality of support plates; when the airbag is compressed and the internal air pressure increases, the air in the airbag pushes the telescopic tube to extend through the connecting tube, so as to drive the plurality of support plates to rotate and flatten.

[0010] Preferably, the friction block is provided with a second protrusion at the position where it is rotatably connected to the support plate; when the support plate is forced to rotate upward and is in the same plane with the top of the friction block, the second protrusion is used to prevent further upward rotation; a third protrusion is provided on the support plate at a position away from its rotation point, and when multiple support plates are forced to rotate upward and are in the same plane with the top of the friction block, the third protrusion is used to prevent multiple support plates from further rotating upward.

[0011] Preferably, a guide mechanism is provided between the friction block and the cam plate; the guide mechanism includes a connecting block and a ball; the connecting block is provided on the friction block, the ball is provided on the connecting block, a slide groove is provided on the cam plate, and part of the ball slides in the slide groove.

[0012] Preferably, the conveying mechanism comprises a winding roller, a driving mechanism and a plurality of guide shafts; the winding roller and the guide shafts are both rotatably connected to the mounting frame, the axis of the winding roller is parallel to the axis of the guide shaft, one end of the film is wound around the winding roller, and the film is tensioned on the guide shaft; the driving mechanism is arranged on the mounting frame, and the driving mechanism is used to drive the film to be conveyed; The driving mechanism includes a driving roller and a first motor; the driving roller is rotatably connected to a mounting frame, and the axis of the driving roller is parallel to the axis of the guide shaft; the first motor is mounted on the mounting frame, and the output end of the first motor is coaxially connected to the driving roller.

[0013] Preferably, the printing mechanism also includes an ink tank, a smear roller and a second motor; the ink tank is arranged on a mounting frame, the smear roller is rotatably connected to the mounting frame, and the smear roller is arranged above the ink tank, the ink tank is filled with ink, the smear roller is partially immersed in ink, the axis of the smear roller is parallel to the axis of the embossing roller, and the top of the smear roller is in conflict with the embossing roller, the second motor is installed on the mounting frame, and the output end of the second motor is coaxially connected to the smear roller.

[0014] Preferably, a first tension adjustment mechanism is also provided on the mounting frame; the first tension adjustment mechanism includes a slide, a pressure roller and a cylinder; a pair of slides are slidably connected to the mounting frame, both ends of the pressure roller are rotatably connected to the slide, and the axis of the pressure roller is parallel to the axis of the embossing roller, the cylinder is installed on the mounting frame, and the output end of the cylinder is connected to the slide.

[0015] A method for using a double-sided printing synchronous printing device comprises the following steps: Step 1, printing and conveying: conveying the film through the conveying mechanism, during which the film is conveyed, printing is performed on one side of the film through the printing mechanism; after printing is completed, the upper and lower sides of the film are turned over by the conveying mechanism; when the film is conveyed to the position of another printing mechanism by the conveying mechanism, printing is performed on the other side of the film by another printing mechanism; Step 2: Tension control: When the force on the film in the width direction changes during printing of the film by the printing mechanism, the thrust of the spring on the friction block is transmitted to the film to offset the change in the force on the film in the width direction.

[0016] Beneficial effects of the present invention: 1. By setting up a second tension adjustment mechanism, the tension in the width direction of the film can be controlled in real time during the printing process to offset the tension change in the width direction during printing and reduce the generation of printing wrinkles; and after the printing at this position is completed, the tension control in the width direction of the film can be automatically restored to ensure the printing effect while facilitating the stable transportation of the film; 2. By setting a support mechanism, during the movement of the friction block, the support mechanism synchronously fills the gap to support the film at the gap position to reduce the generation of wrinkles; 3. By setting up a linkage mechanism, the linkage mechanism can be driven to move during the movement of the friction block, thereby causing multiple support plates to move, thereby supporting the film at the gap position; and when the friction block moves and resets, the linkage mechanism can be used to drive multiple support plates to move and reset, thereby achieving the purpose of ensuring effective support for the film at the gap position as the size of the gap changes continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention after the film is removed as a whole; Figure 3 It is a schematic diagram of the side cutaway structure of the present invention; Figure 4 It is a three-dimensional enlarged structural schematic diagram of the embossing roller of the present invention; Figure 5 It is a schematic diagram of a partially cutaway enlarged structure of the embossing roller of the present invention in a front view; Figure 6 The present invention Figure 5 A schematic diagram of the enlarged structure of the middle A area; Figure 7 It is a three-dimensional enlarged structural schematic diagram of the cam disc of the present invention; Figure 8 It is a schematic diagram of a three-dimensional enlarged structure of the friction block and the connecting block of the present invention; Fig. 9 It is a schematic diagram of a three-dimensional enlarged structure of the friction block of the present invention; Fig.10 It is a partially cutaway three-dimensional enlarged structural schematic diagram of the friction block of the present invention; Fig.11 It is a schematic diagram of a three-dimensional enlarged structure of a support plate of the present invention; Fig.12 It is a flow chart of the method of the present invention.

[0019] In the figure: 1, mounting frame; 2, conveying mechanism; 21, unwinding roller; 22, guide shaft; 23, driving mechanism; 231, driving roller; 232, first motor; 3, printing mechanism; 31, ink tank; 32, smear roller; 33, impression roller; 34, second motor; 4, first tension adjustment mechanism; 41, slide; 42, pressure roller; 43, cylinder; 5, second tension adjustment mechanism; 51, friction block; 52, connecting shaft; 5 3. Spring; 54. Cam plate; 541. First protrusion; 542. Recess; 55. Support mechanism; 551. Support plate; 552. Connecting rod; 553. Second protrusion; 554. Third protrusion; 56. Linkage mechanism; 561. Push block; 562. Air bag; 563. Connecting tube; 564. Telescopic tube; 57. Guide mechanism; 571. Connecting block; 572. Ball; 573. Slide groove; 6. Film. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figure 1-10 As shown, a double-sided printing synchronous printing device, such as Figure 1-6 As shown, it includes a mounting frame 1, on which a conveying mechanism 2 and a printing mechanism 3 are arranged; the printing mechanism 3 includes an embossing roller 33 rotatably connected to the mounting frame 1, and a film 6 is tensioned on the embossing roller 33; a second tension adjustment mechanism 5 is arranged between the mounting frame 1 and the embossing roller 33; the second tension adjustment mechanism 5 includes: a plurality of friction blocks 51, the plurality of friction blocks 51 are all slidably connected along the axial direction of the embossing roller 33, and the plurality of friction blocks 51 form a circular ring structure with the axis of the embossing roller 33 as the center, and the outer diameter of the circular ring structure is equal to the diameter of the embossing roller 33. The same; a spring 53, the spring 53 is arranged between the embossing roller 33 and the friction block 51; and a cam plate 54, the cam plate 54 is arranged on the mounting frame 1, and the cam plate 54 is in conflict with the friction block 51; the cam plate 54 includes a first protrusion 541 and a recessed portion 542, and the first protrusion 541 and the recessed portion 542 are connected to each other end to end; when the friction block 51 moves from a position in conflict with the first protrusion 541 to a position in conflict with the recessed portion 542, the friction block 51 is pushed to move toward the end of the embossing roller 33 by the spring 53.

[0022] It should be noted that, during the process of the film 6 being transported by the transport mechanism 2, printing is performed by the printing mechanism 3, and the embossing roller 33 rotates as the film 6 is transported, thereby printing the film 6; Before printing on the film 6, the first protrusion 541 of the cam plate 54 contacts the friction block 51, so that the spring 53 is in a relatively large compression state. At this time, the film 6 is stretched on the embossing roller 33 through the conveying mechanism 2, and the film 6 is stretched on the friction block 51 near the edge. During printing, the friction block 51 moves from contacting with the first protrusion 541 to contacting with the recessed portion 542. At this time, the friction block 51 is pushed to move by the spring 53, so that the friction block 51 forms a pulling force on the film 6 away from the center of the embossing roller 33. During the printing process, the concave and convex design of the embossing pattern will cause the film 6 to deform in the width direction. In order to resist In order to eliminate the tension in the width direction caused by such deformation, the friction block 51 applies an outward pulling force (i.e., away from the center of the embossing roller 33) to the film 6, thereby effectively balancing the tension of the film 6; this not only ensures the printing quality, but also avoids the waste or damage of materials caused by deformation. In this process, the friction between the friction block 51 and the film 6 prevents relative sliding between the friction block 51 and the film 6, thereby ensuring that the deformation of the film 6 in the width direction during printing can be effectively offset; the tension generated in the width direction of the film 6 during printing is offset by the compressed spring 53, thereby preventing the film 6 from being wrinkled due to lack of tension control in the width direction during printing; After the printing at this position is completed, as the conveying mechanism 2 conveys the film 6, the position where the film 6 is printed will be separated from the friction block 51, and the friction block 51 moves from the contact with the recessed portion 542 to the contact with the first protruding portion 541, that is, the spring 53 is pushed to restore a certain amount of compression, and the friction block 51 is reset, so that it is easy to rotate to the next printing position to offset the tension in the width direction of the film 6 during printing; since the printing at this position is completed, the tension in the width direction of the film 6 caused by printing disappears, and since the friction block 51 moves from the contact with the recessed portion 542 to the contact with the first protruding portion 541, the tension in the width direction of the film 6 also disappears, which does not affect the conveying of the film 6 after printing, thereby ensuring the printing quality; The spring 53 is used to offset the tension in the width direction of the film 6 during printing. Due to the complex texture and wear of the embossing roller 33 during printing, the tension in the width direction of the film 6 is in a constantly changing state. When the tension in the width direction of the film 6 changes during printing, the spring 53 in the compressed state is also stressed so that the elastic force changes accordingly, thereby being able to adapt to the complex tension changes in the width direction of the film 6 during printing. It is understandable that the distance between the cam plate 54 and the friction block 51 can be adjusted according to different printing structures, that is, the initial elastic force of the spring 53 can be controlled to adapt to printing operations under different conditions.

[0023] like Figure 1-6As shown, the second tension adjustment mechanism 5 further includes a support mechanism 55 ; when the friction block 51 moves away from the center position of the embossing roller 33 , the support mechanism 55 is used to fill the gap between the friction block 51 and the embossing roller 33 .

[0024] It should be noted that, when the friction block 51 moves away from the center position of the embossing roller 33, a gap will be generated between the friction block 51 and the embossing roller 33, and there is a lack of support for the film 6 at the gap position, so that in the process of conveying the film 6, downward concave wrinkles will be generated at the gap position; therefore, in the process of moving the friction block 51, the gap is synchronously filled by the support mechanism 55 to achieve support for the film 6 at the gap position to reduce the generation of wrinkles.

[0025] like Figure 5-6 As shown, the support mechanism 55 includes a linkage mechanism 56, a plurality of support plates 551 and a connecting rod 552; adjacent support plates 551 are rotatably connected via the connecting rod 552, wherein one of the support plates 551 is rotatably connected to the friction block 51; the linkage mechanism 56 is disposed between the friction block 51 and the embossing roller 33; when the friction block 51 moves away from the center position of the embossing roller 33, the plurality of support plates 551 are driven to rotate and flatten through the linkage mechanism 56 to fill the gap between the friction block 51 and the embossing roller 33.

[0026] It should be noted that when the friction block 51 moves away from the center of the embossing roller 33, the linkage mechanism 56 is driven to move, and the linkage mechanism 56 pushes the multiple support plates 551 to move. With the cooperation of the multiple connecting rods 552, the multiple support plates 551 are flattened from the arc-shaped contracted state, so that they are in the same plane with the top of the friction block 51, so as to realize the film 6 at the gap position (such as Figure 1 When the friction block 51 is moved and reset, the linkage mechanism 56 can be used to drive the plurality of support plates 551 to move and restore the arc-shaped contracted state; It is understandable that an arc-shaped extension portion (such as Figure 6 As shown), the arc-shaped extension portion is adapted to the structure of the multiple support plates 551 in an arc-shaped contracted state; when the distance between the friction block 51 and the center position of the embossing roller 33 is small, and the gap is small, part of the support plates 551 are restricted by the arc-shaped extension portion and cannot be unfolded, until the gap continues to increase, so that more support plates 551 move to form a flattened state; that is, in the process of the gap constantly changing, the gap can always be filled, that is, the effective support of the film 6 at the gap position can be guaranteed; and when the friction block 51 is reset, the arc-shaped extension portion cooperates with the arc-shaped contracted state of the multiple support plates 551, so that the gap between the friction block 51 and the embossing roller 33 disappears, and it is in a flat state, which is conducive to contact with the edge of the film 6, ensuring that the film 6 is in a flat state when in contact.

[0027] like Figure 6 and Fig.10 As shown, the linkage mechanism 56 includes a connecting shaft 52, a push block 561, an airbag 562, a plurality of connecting tubes 563 and a telescopic tube 564; one end of the connecting shaft 52 is connected to the embossing roller 33, the other end of the connecting shaft 52 is inserted into the friction block 51, and the axis of the connecting shaft 52 is parallel to the axis of the embossing roller 33, the push block 561 is arranged at the other end of the connecting shaft 52, the airbag 562 is arranged between the friction block 51 and the push block 561, a plurality of connecting tubes 563 are arranged in the friction block 51, one end of the plurality of connecting tubes 563 are connected to the airbag 562, the other end of the plurality of connecting tubes 563 are respectively connected to the plurality of telescopic tubes 564, and the plurality of telescopic tubes 564 are connected to the plurality of support plates 551; when the airbag 562 is compressed and the internal air pressure increases, the air in the airbag 562 pushes the telescopic tube 564 to extend through the connecting tube 563, so as to drive the plurality of support plates 551 to rotate and flatten.

[0028] It should be noted that when the friction block 51 moves away from the center of the embossing roller 33, the compressed spring 53 pushes the friction block 51 to move. At this time, the airbag 562 is pushed to be compressed through the cooperation of the connecting shaft 52 and the push block 561, so that the air in the airbag 562 flows into the connecting tube 563 and the telescopic tube 564, increasing the air pressure in the connecting tube 563 and the telescopic tube 564. As the friction block 51 moves, the air pressure continues to increase, so that the telescopic tube 564 is stretched by force, thereby pushing the multiple support plates 551 to move, so that the multiple support plates 551 are flattened from the arc-shaped contracted state, so as to fill the gap position; and when the friction block 51 moves to reset, negative pressure is generated in the airbag 562, which can pull the multiple support plates 551 to rotate and reset; In order to improve the stability of the movement of the multiple support plates 551, the telescopic tube 564 can be replaced by an arc-shaped telescopic sleeve structure. The arc-shaped telescopic sleeve is a prior art, which is not shown in the figure and will not be described in detail. It ensures that the multiple support plates 551 move along a certain arc trajectory, improves the stability of the movement of the support plates 551, and thus ensures that the film 6 (such as Figure 1 Stability of the support.

[0029] like Figure 10-11 As shown, the friction block 51 is provided with a second protrusion 553 at the rotation connection position between it and the support plate 551; when the support plate 551 is forced to rotate upward and is in the same plane with the top of the friction block 51, the second protrusion 553 is used to prevent further upward rotation; a third protrusion 554 is provided on the support plate 551 at a position away from its rotation point, and when multiple support plates 551 are forced to rotate upward and are in the same plane with the top of the friction block 51, the third protrusion 554 is used to prevent multiple support plates 551 from further rotating upward.

[0030] It should be noted that when the linkage mechanism 56 pushes the plurality of support plates 551 to be flattened, in order to prevent the plurality of support plates 551 from tilting upward, the film 6 (such as Figure 1 The support at the gap position is not flat enough, and a second protrusion 553 and a third protrusion 554 are provided; that is, when the support plate 551 close to the friction block 51 rotates and flattens, the rotation position of the support plate 551 is restricted by the second protrusion 553, which can prevent the support plate 551 from excessive rotation; and when the support plate 551 adjacent to the support plate 551 rotates, the third protrusion 554 between the two support plates 551 is restricted to prevent the next support plate 551 from excessive rotation, and so on, so that when the plurality of support plates 551 are flattened, they are restricted by the third protrusion 554 on the adjacent support plates 551 to prevent them from excessive rotation, and then when the thrust of the linkage mechanism 56 on the support plate 551 increases again, the plurality of support plates 551 are still in an unchanged flattened state, ensuring that the film 6 at the gap (as shown) is flattened. Figure 1 The supporting effect of

[0031] like Figure 6-9 As shown, a guide mechanism 57 is arranged between the friction block 51 and the cam plate 54; the guide mechanism 57 includes a connecting block 571 and a ball 572; the connecting block 571 is arranged on the friction block 51, the ball 572 is arranged on the connecting block 571, a slide groove 573 is opened on the cam plate 54, and part of the ball 572 slides in the slide groove 573; it should be noted that in the process of the connecting block 571 and the cam plate 54 sliding against each other, the ball 572 slides in the slide groove 573 to ensure the stability of the contact between the connecting block 571 and the cam plate 54 and prevent the force from being offset.

[0032] like Figure 1-3 As shown, it can be understood that the present application does not limit the specific structure and installation method of the conveying mechanism 2, and only a feasible technical solution is provided below; the conveying mechanism 2 includes a winding roller 21, a driving mechanism 23 and a plurality of guide shafts 22; the winding roller 21 and the guide shaft 22 are both rotatably connected to the mounting frame 1, the axis of the winding roller 21 is parallel to the axis of the guide shaft 22, and one end of the film 6 is wound around the winding roller 21, and the film 6 is tensioned on the guide shaft 22; the driving mechanism 23 is arranged on the mounting frame 1, and the driving mechanism 23 is used to promote the conveyance of the film 6; the driving mechanism 23 includes a driving roller 231 and a first motor 232; the driving roller 231 is rotatably connected to the mounting frame 1, and the axis of the driving roller 231 is parallel to the axis of the guide shaft 22, the first motor 232 is installed on the mounting frame 1, and the output end of the first motor 232 is coaxially connected to the driving roller 231.

[0033] It should be noted that the driving roller 231 is driven to rotate by the first motor 232, and the driving roller 231 drives the film 6 to be transported under the guidance of multiple guide shafts 22, so that the film 6 on the winding roller 21 is unwound; through the coordinated use of multiple guide shafts 22, the printed film 6 is turned over, which is convenient for the next step of printing on the other side of the film 6.

[0034] like Figure 1-3 As shown, it can be understood that the present application does not limit the specific structure and installation method of the printing mechanism, and only a feasible technical solution is provided below; the printing mechanism 3 also includes an ink tank 31, a smear roller 32 and a second motor 34; the ink tank 31 is arranged on the mounting frame 1, the smear roller 32 is rotatably connected to the mounting frame 1, and the smear roller 32 is arranged above the ink tank 31, the ink tank 31 is filled with ink, the smear roller 32 is partially immersed in ink, the axis of the smear roller 32 is parallel to the axis of the embossing roller 33, and the top of the smear roller 32 is in conflict with the embossing roller 33, the second motor 34 is installed on the mounting frame 1, and the output end of the second motor 34 is coaxially connected to the smear roller 32.

[0035] It should be noted that, during printing, the second motor 34 is used to drive the smear roller 32 to rotate, so that the ink adhered to the bottom of the smear roller 32 contacts the embossing roller 33, and the ink is smeared on the embossing roller 33. It can be understood that a scraper is provided on the mounting frame 1 to scrape off excess ink on the embossing roller 33. The scraper is a prior art, which is not shown in the figure and will not be described in detail. During the rotation of the smear roller 32, the embossing roller 33 is controlled to rotate synchronously, so that after the embossing roller 33 is smeared with ink, the embossing roller 33 performs printing on the film 6.

[0036] like Figure 1-3 As shown, a first tension adjusting mechanism 4 is also provided on the mounting frame 1; it can be understood that the present application does not limit the specific structure and installation method of the first tension adjusting mechanism 4, and only a feasible technical solution is provided below; the first tension adjusting mechanism 4 includes a slide 41, a pressure roller 42 and a cylinder 43; a pair of slides 41 are slidably connected to the mounting frame 1, both ends of the pressure roller 42 are rotatably connected to the slide 41, and the axis of the pressure roller 42 is parallel to the axis of the embossing roller 33, the cylinder 43 is installed on the mounting frame 1, and the output end of the cylinder 43 is connected to the slide 41.

[0037] It should be noted that, during the process of conveying the film 6, the slide 41 is driven to move by the cylinder 43, which drives the pressure roller 42 to move, so as to adjust the tension between the pressure roller 42 and the film 6, thereby realizing the tension adjustment in the length direction of the film 6 during conveyance, ensuring the printing effect and improving the conveying stability.

[0038] like Figure 1-10 As shown, a method for using a double-sided printing synchronous printing device comprises the following steps: Step 1, printing and conveying: conveying the film 6 through the conveying mechanism 2, and during the conveying process of the film 6, printing is performed on one side of the film 6 through the printing mechanism 3; after the printing is completed, the upper and lower sides of the film 6 are turned over by the conveying mechanism 2; when the film 6 is conveyed to the position of another printing mechanism 3 by the conveying mechanism 2, printing is performed on the other side of the film 6 by the other printing mechanism 3; Step 2: Tension control: When the force on the film 6 in the width direction changes during printing by the printing mechanism 3 , the thrust of the spring 53 on the friction block 51 is transmitted to the film 6 to offset the force change in the width direction of the film 6 .

[0039] It should be noted that by timely controlling the tension change in the width direction of the film 6 during printing, the tension change in the width of the film 6 during printing can be offset. When the film 6 is transported after printing, the tension control in the width direction of the film 6 is automatically restored, which ensures the printing effect while facilitating the stable transportation of the film 6.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A double-sided synchronous printing device, comprising a mounting frame (1), wherein a conveying mechanism (2) and a printing mechanism (3) are arranged on the mounting frame (1); characterized in that: The printing mechanism (3) comprises an embossing roller (33) rotatably connected to the mounting frame (1), and the film (6) is tensioned on the embossing roller (33); a second tension adjustment mechanism (5) is provided between the mounting frame (1) and the embossing roller (33); the second tension adjustment mechanism (5) comprises: A plurality of friction blocks (51), wherein the plurality of friction blocks (51) are all slidably connected along the axial direction of the embossing roller (33), and the plurality of friction blocks (51) form a circular ring structure with the axis of the embossing roller (33) as the center, and the outer diameter of the circular ring structure is the same as the diameter of the embossing roller (33); A spring (53), wherein the spring (53) is arranged between the embossing roller (33) and the friction block (51); and a cam plate (54), wherein the cam plate (54) is arranged on the mounting frame (1), and the cam plate (54) is in conflict with the friction block (51); The cam plate (54) comprises a first protruding portion (541) and a recessed portion (542), wherein the first protruding portion (541) and the recessed portion (542) are connected end to end; when the friction block (51) moves from a position in contact with the first protruding portion (541) to a position in contact with the recessed portion (542), the friction block (51) is pushed away from the center position of the embossing roller (33) by the spring (53).

2. A double-sided printing synchronous printing device according to claim 1, characterized in that: The second tension adjustment mechanism (5) further comprises a support mechanism (55); when the friction block (51) moves away from the center position of the embossing roller (33), the support mechanism (55) is used to fill the gap between the friction block (51) and the embossing roller (33).

3. A double-sided printing synchronous printing device according to claim 2, characterized in that: The support mechanism (55) comprises a linkage mechanism (56), a plurality of support plates (551) and a connecting rod (552); adjacent support plates (551) are rotatably connected via the connecting rod (552), and one of the support plates (551) is rotatably connected to the friction block (51); the linkage mechanism (56) is arranged between the friction block (51) and the embossing roller (33); when the friction block (51) moves away from the center position of the embossing roller (33), the plurality of support plates (551) are driven by the linkage mechanism (56) to rotate and flatten, so as to fill the gap between the friction block (51) and the embossing roller (33).

4. A double-sided printing synchronous printing device according to claim 3, characterized in that: The linkage mechanism (56) comprises a connecting shaft (52), a push block (561), an airbag (562), a plurality of connecting tubes (563) and a telescopic tube (564); one end of the connecting shaft (52) is connected to the embossing roller (33), the other end of the connecting shaft (52) is inserted into the friction block (51), and the axis of the connecting shaft (52) is parallel to the axis of the embossing roller (33); the push block (561) is arranged at the other end of the connecting shaft (52), and the airbag (562) is arranged between the friction block (51) and the push block (561). The plurality of connecting tubes (563) are arranged in the friction block (51); one end of the plurality of connecting tubes (563) is communicated with the airbag (562); the other end of the plurality of connecting tubes (563) is respectively connected to a plurality of telescopic tubes (564); and the plurality of telescopic tubes (564) are connected to a plurality of support plates (551); when the airbag (562) is compressed and the internal air pressure increases, the air in the airbag (562) pushes the telescopic tube (564) to extend through the connecting tube (563), thereby driving the plurality of support plates (551) to rotate and flatten.

5. A double-sided printing synchronous printing device according to claim 4, characterized in that: The friction block (51) is provided with a second protrusion (553) at a position where it is rotatably connected to the support plate (551); when the support plate (551) is forced to rotate upward and is in the same plane as the top of the friction block (51), the second protrusion (553) is used to prevent further upward rotation; a third protrusion (554) is provided on the support plate (551) at a position away from its rotation point; when a plurality of support plates (551) are forced to rotate upward and are in the same plane as the top of the friction block (51), the third protrusion (554) is used to prevent the plurality of support plates (551) from further rotating upward.

6. A double-sided printing synchronous printing device according to claim 1, characterized in that: A guide mechanism (57) is provided between the friction block (51) and the cam plate (54); the guide mechanism (57) comprises a connecting block (571) and a ball (572); the connecting block (571) is provided on the friction block (51), the ball (572) is provided on the connecting block (571), a sliding groove (573) is provided on the cam plate (54), and a portion of the ball (572) slides in the sliding groove (573).

7. A double-sided printing synchronous printing device according to claim 1, characterized in that: The conveying mechanism (2) comprises a winding roller (21), a driving mechanism (23) and a plurality of guide shafts (22); the winding roller (21) and the guide shafts (22) are both rotatably connected to the mounting frame (1), the axis of the winding roller (21) is parallel to the axis of the guide shaft (22), one end of the film (6) is wound around the winding roller (21), and the film (6) is tensioned on the guide shaft (22); the driving mechanism (23) is arranged on the mounting frame (1), and the driving mechanism (23) is used to drive the film (6) for conveyance; The driving mechanism (23) comprises a driving roller (231) and a first motor (232); the driving roller (231) is rotatably connected to the mounting frame (1), and the axis of the driving roller (231) is parallel to the axis of the guide shaft (22); the first motor (232) is mounted on the mounting frame (1), and the output end of the first motor (232) is coaxially connected to the driving roller (231).

8. The double-sided printing synchronous printing device according to claim 1, characterized in that: The printing mechanism (3) further comprises an ink tank (31), a coating roller (32) and a second motor (34); the ink tank (31) is arranged on the mounting frame (1), the coating roller (32) is rotatably connected to the mounting frame (1), and the coating roller (32) is arranged above the ink tank (31), the ink tank (31) is filled with ink, the coating roller (32) is partially immersed in the ink, the axis of the coating roller (32) is parallel to the axis of the embossing roller (33), and the top of the coating roller (32) is in conflict with the embossing roller (33); the second motor (34) is mounted on the mounting frame (1), and the output end of the second motor (34) is coaxially connected to the coating roller (32).

9. A double-sided printing synchronous printing device according to claim 1, characterized in that: The mounting frame (1) is also provided with a first tension adjustment mechanism (4); the first tension adjustment mechanism (4) comprises a slide seat (41), a pressure roller (42) and a cylinder (43); a pair of the slide seats (41) are slidably connected to the mounting frame (1), the two ends of the pressure roller (42) are rotatably connected to the slide seats (41), and the axis of the pressure roller (42) is parallel to the axis of the embossing roller (33); the cylinder (43) is mounted on the mounting frame (1), and the output end of the cylinder (43) is connected to the slide seat (41).

10. A method for using a double-sided printing synchronous printing device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, printing and conveying: conveying the film (6) by the conveying mechanism (2), and during the process of conveying the film (6), printing is performed on one side of the film (6) by the printing mechanism (3); after printing is completed, the film (6) is turned over on both sides by the conveying mechanism (2); when the film (6) is conveyed to the position of another printing mechanism (3) by the conveying mechanism (2), printing is performed on the other side of the film (6) by the other printing mechanism (3); Step 2: Tension control: During the process of printing the film (6) by the printing mechanism (3), when the force applied to the film (6) in the width direction changes, the thrust of the spring (53) on the friction block (51) is transmitted to the film (6) to offset the change in the force applied to the film (6) in the width direction.

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