A printing device with double composite printing mechanism

Abstract

The utility model discloses a printing device with a double composite printing mechanism, and belongs to the technical field of tissue printing equipment. The utility model includes a frame, and the frame is provided with a composite printing mechanism and a transition roller group; the composite printing mechanism is provided with two groups in an upper and lower manner, including a printing roller group for printing respective single sheets of base paper, and a composite roller group for compounding multiple sheets of base paper after printing; the transition roller group is used to guide the base paper and the composite tissue paper during the conveying process. The utility model provides two groups of composite printing mechanisms in an upper and lower manner, so that the structure of the entire printing device is more compact, the utilization rate of space is greatly improved, and the floor space is reduced. At the same time, the composite tissue paper compounded by the two groups of composite printing mechanisms is discharged from the same side of the frame, so that it can maintain a good match with the folding machine, which is conducive to ensuring the smoothness of production.

Description

Technical Field

[0001] The utility model belongs to the technical field of paper towel printing equipment, and more specifically relates to a printing device with a double composite printing mechanism. Background Art

[0002] Tissue paper is a necessity in people's daily life. It can be divided into roll paper and tissue paper according to the packaging form. Tissue paper is divided into square or rectangular shapes, stacked on top of each other, and then put into a paper box with a small opening. Each time you take out a sheet, you can take out another sheet at the same time. Tissue paper is therefore named. Tissue paper is also widely favored by consumers because of its convenience in use and carrying.

[0003] In order to improve the fluffiness and water absorption capacity of tissue paper, the base paper needs to be embossed and laminated before folding and packaging to achieve this goal.

[0004] For example, in the application CN112693956A, the paper is firstly embossed and printed by an embossing machine, and then the paper is folded in a folding machine.

[0005] In the application case of CN214522337U, the base paper enters the embossing mechanism under the traction of the traction mechanism to be embossed on the base paper, and the embossed paper napkin enters the folding mechanism to complete the folding of the napkin.

[0006] In the application case of CN215751066U, the base paper is compositely embossed in sequence through the paper unwinding rack, embossing rack, embossing composite rack and paper extraction machine head, and the base paper is compositely embossed, so that the composite embossed parts are tightly pressed together to prevent the paper from being layered. In this application case, although the paper can be compositely printed before being folded, the printing and composite mechanisms are relatively independent, resulting in a large floor space required for the entire production line, which results in a low utilization rate of space. Utility Model Content

[0007] 1. Problems to be solved

[0008] Aiming at the problem that the existing composite printing device occupies a large area and has a low space utilization rate, the utility model provides a printing device with a double composite printing mechanism. In the utility model, the two groups of composite printing mechanisms are distributed up and down, which can effectively improve the space utilization rate of the whole device.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solution adopted by the utility model is as follows:

[0011] The utility model discloses a printing device with a double composite printing mechanism, comprising a frame, wherein the composite printing mechanism and a transition roller group are arranged on the frame.

[0012] The composite printing mechanism is provided with two groups, one above the other, including a printing roller group for printing a single sheet of base paper, and a composite roller group for composite multiple sheets of base paper after printing; and the composite paper towels composited by the two groups of composite printing mechanisms are discharged from the same side of the frame;

[0013] The transition roller group is used to guide the paper feeding and paper discharging of the paper towel.

[0014] Furthermore, the transition roller set includes a fourth guide roller, and the fourth guide roller has an outwardly convex flattening portion, which is always in contact with the base paper and is used to unfold the base paper from the middle to both sides.

[0015] Furthermore, the fourth guide roller is an arc roller, the outer arc surface of the arc roller forms the flattening portion, and the rotation angle of the fourth guide roller is adjustable, so that the base paper is always in contact with the outer arc surface of the arc roller.

[0016] Furthermore, the fourth guide roller is a rod-shaped structure that tapers from the middle to both ends, the periphery of the rod-shaped structure forms the flattened portion, and the end of the fourth guide roller is rotatably arranged on the frame.

[0017] Furthermore, the composite printing mechanism comprises a first rubber roller, a second rubber roller, a first printing roller and a second printing roller.

[0018] The first rubber roller cooperates with the first printing roller, and the second rubber roller cooperates with the second printing roller, each forming a printing roller group;

[0019] The first printing roller and the second printing roller cooperate with each other to form the composite roller group.

[0020] Furthermore, the first printing roller is connected with an adjusting component, and the adjusting component is arranged in a first mounting groove opened on the base plate of the frame;

[0021] The adjustment component includes a rotating plate, and the end of the first printing roller is rotatably arranged on the rotating plate; the rotating plate is hinged in the first mounting groove, and the other end is hinged to a driving source; the rotating plate swings under the drive of the driving source, so that the two printing rollers move away from or closer to each other.

[0022] Furthermore, a second mounting groove for the second printing roller to be inserted is opened on one side of the first mounting groove on the substrate, so that the axes of the two printing rollers are located in a horizontal plane; a blocking plate is provided in the second mounting groove, and beams are provided at the four corners of the two substrates.

[0023] Furthermore, the two sets of composite printing mechanisms are arranged symmetrically in an upper and lower direction.

[0024] Furthermore, in the composite printing mechanism located above, the central axes of the first rubber roller, the first printing roller and the second printing roller are located on the same horizontal plane and are distributed in sequence along the conveying direction of the paper; the second rubber roller is located above the second printing roller.

[0025] Furthermore, the first printing roller and the second printing roller are both provided with a compounding part, and the pressing surfaces of a pair of compounding parts located at the compounding position on the two printing rollers have at least partial areas corresponding to each other on the top, which are used for pressing and compounding the paper towel.

[0026] Furthermore, the first printing roller or the second printing roller is connected to a motor, and the two printing rollers are driven by gear meshing;

[0027] At least one of the two gears can be rotated and adjusted relative to the embossing roller connected thereto, so that when the two gears are meshed with each other, a pair of composite parts located at the composite position on the two embossing rollers at least partially correspond to each other.

[0028] Furthermore, the transition roller group further comprises a first guide roller, a second guide roller and a third guide roller; wherein the first guide roller is used to guide the base paper entering the respective printing roller groups;

[0029] The second guide roller is used to guide the composite paper towel coming out of the composite roller group, and the second guide roller is located between the two composite printing mechanisms;

[0030] The third guide roller is located on one side of the second guide roller, and the third guide rollers of the two composite printing mechanisms are distributed up and down, and are used to adjust the conveying height of the composite paper towel;

[0031] Wherein, the first guide roller and the third guide roller are respectively arranged on both sides of the frame through their own brackets, and their positions in the vertical direction are adjustable.

[0032] 3. Beneficial effects

[0033] Compared with the prior art, the beneficial effects of the utility model are:

[0034] (1) The utility model is a printing device with a double composite printing mechanism. The composite printing mechanism is arranged in two groups in an upper and lower manner, so that the structure of the entire printing device is more compact, the utilization rate of space is greatly improved, and the floor space is reduced; at the same time, the composite paper towels compounded by the two groups of composite printing mechanisms are discharged from the same side of the frame, so that the final paper discharge position of the composite paper towels can be well matched with the folding machine, so as to ensure a good connection between the processes, which is beneficial to improving the fluency of the entire production process.

[0035] (2) The utility model is a printing device with a double composite printing mechanism. By setting an arc guide roller, the base paper is in contact with the outer arc surface of the arc roller, so that the base paper is unfolded from the middle to both sides to prevent the base paper from wrinkling and deforming before entering the printing roller group, which can effectively ensure the printing effect.

[0036] (3) The utility model is a printing device with a double composite printing mechanism. Through the optimized design of the composite printing mechanism, four rollers can complete the printing and composite operations of paper towels, thereby greatly reducing the number of rollers and their accessories used, which is conducive to saving costs and space. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of a printing device with a double composite printing mechanism of the utility model;

[0038] Figure 2 This is a front view of a printing device with a double composite printing mechanism of the utility model;

[0039] Figure 3 It is a structural schematic diagram of the frame in the utility model;

[0040] Figure 4 This is a schematic diagram of the internal structure of the printing device of the utility model;

[0041] Figure 5 It is a structural schematic diagram of the composite printing mechanism in the utility model;

[0042] Figure 6 It is a partial enlarged schematic diagram of the adjustment component in the utility model.

[0043] In the figure: 1, frame; 11, base plate; 12, crossbeam; 13, support plate; 14, first mounting groove; 15, second mounting groove; 16, blocking plate;

[0044] 2. Composite printing mechanism; 21. First rubber roller; 22. Second rubber roller; 23. First printing roller; 24. Second printing roller;

[0045] 3. Transition roller group; 31. First guide roller; 32. Second guide roller; 33. Third guide roller; 34. Fourth guide roller; 35. Brush roller; 36. Lubricating roller;

[0046] 4. Protective rod; 5. Motor; 6. Adjustment assembly; 61. Rotating plate; 62. Driving source; 63. Connecting plate. DETAILED DESCRIPTION

[0047] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] The utility model is further described below in conjunction with specific embodiments.

[0050] Example 1

[0051] like Figure 1 , Figure 2 As shown, a printing device with a double composite printing mechanism in this embodiment includes a frame 1 and a composite printing mechanism 2, a transition roller group 3 and a motor 5 arranged on the frame 1.

[0052] Among them, the composite printing mechanism 2 is provided with two groups in the upper and lower parts, which are used to print and compound the base paper to obtain composite paper towels, and the composite paper towels compounded by the two groups of composite printing mechanisms 2 are discharged from the same side of the frame 1; the transition roller group 3 is used to guide the base paper and the composite paper towel during the conveying process; the motor 5 serves as a power source to provide rotational power for the roller body of the composite printing mechanism 2.

[0053] refer to Figure 3 As shown, the frame 1 includes two base plates 11 arranged opposite to each other, the two base plates 11 are connected by a plurality of cross beams 12, and a support plate 13 is connected to the bottom of each base plate 11 to ensure the connection strength of the entire frame 1.

[0054] The composite printing mechanism 2 includes a printing roller group and a composite roller group. The printing roller group is used to print a single sheet of base paper, and the composite roller group is used to composite multiple sheets of printed base paper to form a replica tissue.

[0055] refer to Figure 4 As shown, the transition roller set 3 includes a first guide roller 31 , a second guide roller 32 and a third guide roller 33 .

[0056] Each embossing roller group is equipped with at least one first guide roller 31, and the first guide roller 31 is used to guide the base paper entering the respective embossing roller group.

[0057] Each composite roller group is equipped with at least one second guide roller 32, and the second guide roller 32 is used to guide the composite paper towel coming out of the composite roller group.

[0058] The third guide roller 33 is located on one side of the second guide roller 32, and the third guide rollers 33 of the two composite printing mechanisms 2 are distributed up and down, and are used to adjust the conveying height of the composite paper towel so that it can be well matched with the folding machine to ensure a good connection between the processes, which is beneficial to improving the smoothness of the entire production process.

[0059] Specifically in this embodiment, each composite printing mechanism 2 is provided with two printing roller groups and one composite roller group, each printing roller group is equipped with a first guide roller 31, each composite roller group is equipped with a second guide roller 32, and the two first guide rollers 31 are staggered in the upper and lower positions.

[0060] The first guide roller 31 and the third guide roller 33 are respectively arranged on both sides of the frame 1 through their respective brackets, and their positions in the vertical direction are adjustable. The vertical adjustment mechanism can adopt existing technology, such as a guide rod plus a sliding block, or screw adjustment, etc. The second guide roller 32 is arranged on the inner side wall of the base plate 11.

[0061] It should be noted that the first guide roller 31 and / or the third guide roller 33 in this embodiment do not have to be set on this device. The first guide roller 31 and / or the third guide roller 33 can also be set separately or on the equipment corresponding to the upper and lower processes.

[0062] In the printing device with a double composite printing mechanism of this embodiment, the transition roller group 3 further includes a fourth guide roller 34 , a brush roller 35 and a lubrication roller 36 .

[0063] Among them, the fourth guide roller 34 is located between the first guide roller 31 and the corresponding printing roller group. The fourth guide roller 34 unfolds the base paper from the middle to both sides, and then enters the printing roller group for printing to prevent the base paper from wrinkling and deforming before entering the printing roller group, thereby affecting the printing effect.

[0064] Specifically, the fourth guide roller 34 has an outwardly convex flattening portion, which is always in contact with the base paper, so as to unfold the base paper from the middle to both sides.

[0065] As an implementation manner of the fourth guide roller 34, the fourth guide roller 34 is an arc roller, and the outer arc surface of the arc roller forms the flattening portion.

[0066] Alternatively, a single outwardly convex arc portion is directly provided on a common cylindrical roller body to serve as the above-mentioned flattening portion to realize the unfolding operation of the base paper.

[0067] Whether it is the above-mentioned arc-shaped roller or a separately provided convex arc-shaped portion, the orientation of the flattened portion formed in this way is fixed at a certain moment. In order to ensure that the orientation of the flattened portion can be adjusted according to the angle of entry of the paper, so that the base paper can always contact the outer arc surface of the arc-shaped roller, and achieve the best unfolding effect, the fourth guide roller 34 in this embodiment is rotatable to meet the requirements of different paper feeding angles.

[0068] The specific rotating structure can adopt the existing technology. For example, a worm wheel is arranged at the end of the arc roller, and the worm wheel is connected to a worm; the rotation adjustment of the arc roller is realized through the meshing transmission of the worm wheel and the worm; or other structures are formed.

[0069] Although the fourth guide roller 34 can adjust the direction of the flattening portion, the direction of the flattening portion must be adjusted each time the paper feeding angle is changed, which is not conducive to improving production efficiency. At the same time, the structure of the fourth guide roller 34 makes it virtually motionless during operation, thereby increasing the friction resistance between the fourth guide roller 34 and the paper.

[0070] To this end, another implementation of the fourth guide roller 34 is also proposed in this embodiment. The fourth guide roller 34 is a rod-shaped structure that tapers from the middle to both ends (axially). The outer periphery of the rod-shaped structure forms the above-mentioned flattening portion, and the end of the fourth guide roller 34 is rotatably arranged on the frame 1. This design ensures that the paper can contact the flattening portion of the fourth guide roller 34 no matter from which angle the paper is fed, thereby achieving a flattening effect. At the same time, the fourth guide roller 34 in this embodiment can rotate during operation, thereby greatly reducing the friction resistance of the paper towel.

[0071] The brush roller 35 is arranged beside the printing roller group, and is used to clean the paper scraps adhered to the printing roller in time. At the same time, in order to prevent the paper scraps from falling onto the paper towel or roller body below, a scrap collecting box for collecting the falling paper scraps is arranged below the brush roller 35.

[0072] The lubricating roller 36 is also arranged beside the printing roller group. The lubricating roller 36 is provided with an oily felt so as to provide lubricating oil for the printing roller.

[0073] In addition, in order to prevent fingers from being accidentally caught between the printing rollers during manual paper feeding, a protective rod 4 is provided at the entrance of the paper towel of the printing roller group, so as to form a shield at the entrance of the paper towel to prevent fingers from being caught. At the same time, a gap is left between the protective rod 4 and the rubber roller for the paper towel to pass through.

[0074] Preferably, the protection rod 4 is an L-shaped angle iron.

[0075] In the printing device with double composite printing mechanisms of this embodiment, the composite printing mechanisms 2 are arranged in two groups in an upper and lower manner, making the structure of the entire printing device more compact, greatly improving the utilization rate of space, and reducing the floor space. At the same time, the composite paper towels composited by the two groups of composite printing mechanisms 2 are discharged from the same side of the frame 1, so that the final paper discharge position of the composite paper towels can be well matched with the folding machine to ensure a good connection between the processes, which is beneficial to improving the fluency of the entire production process.

[0076] It should be noted that the composite printing mechanism 2 in this embodiment can be formed by the adhesive composite in CN110202842A, DE102021123043A1, or the adhesive-free composite form in CN108481986A, CN214938522U, or can be formed by other structures in the prior art, which will not be described one by one here.

[0077] Example 2

[0078] In order to minimize the number of rollers and their components used, and to further reduce the space occupied by the entire printing device, in this embodiment, the specific structure of the composite printing mechanism 2 is optimized.

[0079] refer to Figure 5 As shown, the composite printing mechanism 2 includes a first rubber roller 21 , a second rubber roller 22 , a first printing roller 23 and a second printing roller 24 .

[0080] Among them, both the first printing roller 23 and the second printing roller 24 are provided with a compounding part, and a pair of compounding parts located at the compounding position on the two printing rollers have at least partial areas of the top pressing surfaces corresponding to each other, which are used for pressing and compounding the paper towel.

[0081] The first printing roller 23 cooperates with the first rubber roller 21 to form a printing roller group, and a printed pattern is formed on a base paper through the composite part on the first printing roller 23;

[0082] The second printing roller 24 cooperates with the second rubber roller 22 to form another printing roller group, and a printed pattern is formed on another base paper through the composite part on the second printing roller 24;

[0083] The first printing roller 23 and the second printing roller 24 cooperate with each other to form a composite roller group. The composite parts on the two printing rollers cooperate with each other at the composite position, so that the two base papers with printed patterns are intertwined with each other under the pressure of the composite part to form a non-gel composite.

[0084] The above-mentioned compound position refers to the point where the compound parts rotate with their respective printing rollers to a certain point, at which time the gap between a pair of compound parts on different printing rollers is the smallest, and the paper towel is pressed and compounded at this point, which is the compound position.

[0085] In addition, in order to further reduce the number of driving devices used, the first printing roller 23 or the second printing roller 24 is connected to a motor 5, and the two printing rollers are driven by gear meshing (not shown in the figure).

[0086] Furthermore, at least one of the two gears can be rotated and adjusted relative to the embossing rollers connected thereto. When a transmission gap appears between the two gears, one of the gears can be rotated so that the teeth of the gear are close to one side of the tooth groove on the other gear, thereby eliminating the transmission gap in the rotation direction. At the same time, it is necessary to ensure that when the two gears are meshed with each other, a pair of composite parts located at the composite position on the two embossing rollers at least partially correspond to each other.

[0087] Specifically in this embodiment, the motor 5 is connected to one end of the first embossing roller 23, and the other end of the first embossing roller 23 is connected to the first gear. The second gear is connected to the second embossing roller 24 through a tension sleeve, so that the second gear can be continuously rotated relative to the circumference of the second embossing roller 24, so as to facilitate the elimination of the transmission gap.

[0088] In this embodiment, the two sets of composite printing mechanisms 2 are arranged symmetrically in the upper and lower parts. The symmetry here is not a strict geometric symmetry, but a rough symmetry that allows certain differences.

[0089] Among them, the composite printing mechanism 2 located at the top, its first rubber roller 21, first printing roller 23, and second printing roller 24 are distributed from left to right along the conveying direction of the paper, and the central axes of the three rollers are located on the same horizontal plane. The second rubber roller 22 is located above the second printing roller 24, and the second guide roller 32 is located below the second printing roller 24.

[0090] The composite printing mechanism 2 located at the bottom has a first rubber roller 21, a first printing roller 23, and a second printing roller 24, which are arranged from left to right along the conveying direction of the paper, and the central axes of the three rollers are located on the same horizontal plane. The second rubber roller 22 is located below the second printing roller 24, and the second guide roller 32 is located above the second printing roller 24.

[0091] The first embossing roller 23 is equipped with a lubrication roller 36 , and the second embossing roller 24 is equipped with a brush roller 35 , and the brush roller 35 is located on the right side of the second embossing roller 24 .

[0092] The composite part is a truncated cone-shaped protrusion. Of course, the specific shape of the composite part can also be replaced by other shapes, which are not listed one by one here.

[0093] A four-roller printing composite device of this embodiment has the following working principle (taking the printing composite mechanism located above as an example):

[0094] After being guided by the first guide roller 31, the first single-layer base paper enters the printing roller group from the right side of the second rubber roller 22 and the second printing roller 24 for printing;

[0095] After being guided by the first guide roller 31, the second single-layer base paper enters the printing roller group from below the first rubber roller 21 and the first printing roller 23 for printing;

[0096] The two single-layer base papers after printing enter the composite roller group as their respective printing rollers rotate. Under the pressure of a pair of composite parts located at the composite position, the contact parts of the two single-layer base papers are intertwined with each other to form a non-gel composite.

[0097] After the paper towels printed and compounded by the respective compound printing mechanisms 2 are guided by the second guide roller 32 and the third guide roller 33, the two compound paper towels are distributed up and down and are located at a suitable height, so as to prepare for the subsequent folding operation of the paper towels.

[0098] A printing device with a double composite printing mechanism in this embodiment optimizes the arrangement of rollers, so that printing and composite operations of paper towels can be completed with only four rollers, thereby greatly reducing the number of rollers and their accessories used, which is beneficial to saving costs and space.

[0099] Example 3

[0100] The printing device with a double composite printing mechanism in this embodiment is further provided with an adjustment component 6 on the basis of the above embodiment, which is used to adjust the gap between the two printing rollers.

[0101] refer to Figure 4 , Figure 6 As shown, the adjustment assembly 6 includes a rotating plate 61 and a driving source 62; wherein, two rotating plates 61 are arranged opposite to each other, and the two ends of the first printing roller 23 are respectively rotatably arranged in the mounting holes on the rotating plates 61. One end of the rotating plate 61 is hinged to the base plate 11, and the other end is hinged to the output end of the driving source 62, so that the rotating plate 61 can swing under the drive of the driving source 62, so that the two printing rollers are moved away from or close to each other.

[0102] like Figure 3As shown, the substrate 11 is provided with a first mounting groove 14 and a second mounting groove 15. The adjusting assembly 6 is arranged in the first mounting groove 14, and the end of the second printing roller 24 together with the rotating bearing thereon can be installed in the second mounting groove 15.

[0103] Furthermore, the first mounting groove 14 is overall "L"-shaped, the driving source 62 is located in the horizontal section of the first mounting groove 14, and the driving source 62 can be hinged to the base plate 11 through a U-shaped block; the rotating plate 61 is located in the vertical section of the first mounting groove 14, and the rotating plate 61 can be hinged through connecting plates 63 arranged on both sides of the first mounting groove 14.

[0104] The second mounting groove 15 is a notch provided at the edge of the substrate 11 to facilitate the installation of the second embossing roller 24. The second mounting groove 15 is located on one side of the first mounting groove 14, so that the axes of the two embossing rollers are located in a horizontal plane.

[0105] To ensure that the substrate 11 still has sufficient supporting strength after the groove is opened, the second installation groove 15 needs to be sealed with a sealing plate 16 after the second printing roller 24 is installed; at the same time, a crossbeam 12 is added between the two substrates 11, and the crossbeam 12 is located at the four corners of the substrate 11.

[0106] In the printing device with a double composite printing mechanism of this embodiment, when manual paper feeding is required, the two printing rollers are separated from each other by the adjustment component 6 to present an "open" state, thereby ensuring that the paper towel can be more conveniently and quickly inserted into the corresponding roller group. Since the adjustment component 6 adopts a swinging structure, the wear between the components can be effectively reduced; at the same time, the adjustment component 6 is arranged in the first installation groove 14, which can reduce the space it occupies, which is conducive to improving the utilization rate of the space.

[0107] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A printing device with a double composite printing mechanism, comprising a frame (1), wherein the composite printing mechanism (2) and a transition roller group (3) are arranged on the frame (1), characterized in that: The composite printing mechanism (2) is provided in two groups, one above the other, and includes a printing roller group for printing a single sheet of base paper, and a composite roller group for composite multiple sheets of base paper after printing; and the composite paper towels composited by the two groups of composite printing mechanisms (2) are discharged from the same side of the frame (1); The transition roller group (3) is used to guide the paper feeding and paper discharging of the paper towel.

2. A printing device with a double composite printing mechanism according to claim 1, characterized in that: The transition roller group (3) comprises a fourth guide roller (34), and the fourth guide roller (34) has an outwardly convex flattening portion, which is always in contact with the base paper and is used to unfold the base paper from the middle to both sides.

3. A printing device with a double composite printing mechanism according to claim 2, characterized in that: The fourth guide roller (34) is an arc roller, the outer arc surface of the arc roller forms the flattening portion, and the rotation angle of the fourth guide roller (34) is adjustable, so that the base paper is always in contact with the outer arc surface of the arc roller; or, The fourth guide roller (34) is a rod-shaped structure that tapers from the middle to both ends, the outer periphery of the rod-shaped structure forms the flattened portion, and the end of the fourth guide roller (34) is rotatably arranged on the frame (1).

4. A printing device with a double composite printing mechanism according to any one of claims 1 to 3, characterized in that: The composite printing mechanism (2) comprises a first rubber roller (21), a second rubber roller (22), a first printing roller (23) and a second printing roller (24). The first rubber roller (21) and the first printing roller (23) cooperate with each other, and the second rubber roller (22) and the second printing roller (24) cooperate with each other, each forming a printing roller group; The first printing roller (23) and the second printing roller (24) cooperate with each other to form the composite roller group.

5. A printing device with a double composite printing mechanism according to claim 4, characterized in that: The first printing roller (23) is connected to an adjustment component (6), and the adjustment component (6) is arranged in a first installation groove (14) opened on the base plate (11) of the frame (1); The adjusting component (6) comprises a rotating plate (61), on which the end of the first printing roller (23) is rotatably arranged; one end of the rotating plate (61) is hinged in the first mounting groove (14) through a connecting plate (63), and the other end is hinged to a driving source (62); the rotating plate (61) swings under the drive of the driving source (62), so that the two printing rollers move away from or closer to each other.

6. A printing device with a double composite printing mechanism according to claim 5, characterized in that: A second mounting groove (15) for the second printing roller (24) to be inserted is provided on one side of the first mounting groove (14) on the substrate (11), so that the axes of the two printing rollers are located in a horizontal plane; a blocking plate (16) is provided in the second mounting groove (15), and cross beams (12) are provided at the four corners of the two substrates (11).

7. A printing device with a double composite printing mechanism according to claim 4, characterized in that: The two groups of composite printing mechanisms (2) are arranged symmetrically up and down.

8. A printing device with a double composite printing mechanism according to claim 7, characterized in that: The composite printing mechanism (2) is located above, wherein the central axes of the first rubber roller (21), the first printing roller (23) and the second printing roller (24) are located on the same horizontal plane and are distributed in sequence along the conveying direction of the paper; the second rubber roller (22) is located above the second printing roller (24).

9. A printing device with a double composite printing mechanism according to claim 4, characterized in that: The first printing roller (23) and the second printing roller (24) are both provided with a compounding portion, and a pair of compounding portions located at the compounding position on the two printing rollers have at least partial areas of the top pressing surfaces corresponding to each other, which are used for pressing and compounding the paper towel.

10. A printing device with a double composite printing mechanism according to claim 9, characterized in that: The first printing roller (23) or the second printing roller (24) is connected to a motor (5), and the two printing rollers are driven by gear meshing; At least one of the two gears can be rotated and adjusted relative to the embossing roller connected thereto, so that when the two gears are meshed with each other, a pair of composite parts located at the composite position on the two embossing rollers at least partially correspond to each other.

11. A printing device with a double composite printing mechanism according to any one of claims 1 to 3, characterized in that: The transition roller group (3) further comprises a first guide roller (31), a second guide roller (32) and a third guide roller (33); wherein the first guide roller (31) is used to guide the base paper entering the respective printing roller group; The second guide roller (32) is used to guide the composite paper towel coming out of the composite roller group, and the second guide roller (32) is located between the two composite printing mechanisms (2); The third guide roller (33) is located on one side of the second guide roller (32), and the third guide rollers (33) of the two composite printing mechanisms (2) are distributed up and down, and are used to adjust the conveying height of the composite paper towel; The first guide roller (31) and the third guide roller (33) are respectively arranged on both sides of the frame (1) through their own brackets, and their positions in the vertical direction are adjustable.

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