Built-in drying type double-jet printing module sheet-fed digital ink-jet printer
By designing a built-in drying dual-printing module and related auxiliary mechanism in a single-sheet digital inkjet printing press, the problems of insufficient ink drying, easy wrinkle and unstable transfer of paper are solved, and efficient and stable paper transfer and high-quality printing effects are achieved, meeting the printing needs of high-end customers.
Patent Information
- Application Number
- CN202422105481.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-29
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-29
AI Technical Summary
During the drying process, existing single-sheet digital inkjet printing machines have problems such as insufficient ink drying, easy wrinkle of paper, unstable transfer, and blocked inkjet head, which is difficult to meet the high-efficiency and high-quality printing needs of high-end customers.
A single-sheet digital inkjet printing press with built-in drying type double-printing module is designed. By setting up a traction chain and a suction air shaping belt between the printing cylinders, a drying channel is formed, and a drying mechanism is set above the channel to ensure that the paper is fully dried and fixed during the transfer process. At the same time, a paper powder cleaning mechanism and a coating mechanism are set up to improve printing quality and efficiency.
It effectively solves the problems of insufficient ink drying and easy wrinkle on the paper, improves the printing accuracy and quality of reverse printing, ensures the stability of paper transfer, and avoids inkjet head blockage, meeting the high-quality printing needs of high-end customers.
Smart Images
Figure CN223014159U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of inkjet printing equipment, in particular to a built-in drying type double-jet printing module single-sheet digital inkjet printer. Background Art
[0002] Sheet-fed digital inkjet printing machinery can achieve high-precision printing on both sides of a single sheet of paper, and has the advantages of plateless printing, on-demand printing, high speed and high quality.
[0003] In order to achieve high-precision printing, sheet-fed digital inkjet printers usually use rollers with paper gripping mechanisms to accurately transfer paper. Among them, in the model that uses two sets of printing modules to achieve double-sided printing of a single sheet of paper, printing modules are respectively arranged above the front printing roller and the back printing roller. When the paper passes under the first printing module with the front printing roller, the first printing module realizes the printing operation on the front side of the paper. The paper that has completed the front printing is transferred from the paper transfer roller to the back printing roller. When the paper passes under the second printing module with the back printing roller, the second printing module realizes the printing operation on the back side of the paper.
[0004] In the prior art, single-sheet digital inkjet printers that use roller paper feeding are usually unable to be provided with a drying mechanism due to structural design limitations, or can only be provided with a drying mechanism on the outside of the printing roller to improve the drying degree of the printing surface. However, due to the high speed of the roller, the effective drying time of this drying method is very short, and the ink drying effect on the printing surface of the paper is not ideal. The ink on the paper that has completed the front printing is not fully dried and is immediately transferred to the next roller. In this way, after the printing surface of the paper is attached to the surface of the roller, it is easy for the ink to migrate and cause the image and text to be blurred, thereby seriously affecting the quality of inkjet printing. Some companies also use a paper feed belt to transfer the paper that has completed the front printing, and dry the printing surface by setting a drying mechanism on the transmission path of the paper feed belt. Although this method can effectively extend the drying time, the paper will produce wrinkles after absorbing ink and being dried. On the one hand, the paper wrinkles are easy to cause paper jams on the paper feed belt, which seriously affects the stability of paper transmission and production efficiency; on the other hand, the paper wrinkles will also affect the printing accuracy and quality when printing on the reverse side.
[0005] In addition, for the paper used as the printing medium, paper powder usually remains on the paper surface, and paper fluff usually remains at the edges of the paper. When the paper reaches below the inkjet head for inkjet printing, the airflow will cause the paper powder on the paper surface or the paper fluff at the paper edges to fly up, which easily leads to the problem of the inkjet head being blocked by paper powder, seriously affecting the print quality, or affecting the printing efficiency due to shutdown for maintenance. Currently, in single-sheet digital inkjet printers that use rollers to transfer paper, due to the precise transfer requirement of single sheets of paper and being restricted by factors such as a small structural design space and immature technology, no mechanism for online cleaning of paper powder and paper fluff is provided, and it cannot meet the high-efficiency and high-quality printing requirements of high-end customers.
[0006] Furthermore, in order to improve the printing quality and image quality, some high-quality papers need to be coated with a specific medium (coating liquid) before inkjet printing to improve the ink absorption rate. Currently, in the field of single-sheet inkjet printing, this coating process needs to be carried out using separate equipment, which not only has low working efficiency but also requires a large equipment investment and high production costs. Summary of the Utility Model
[0007] To overcome the above deficiencies, the technical problem to be solved by the present utility model is to provide an in-built drying type double-printing module single-sheet digital inkjet printer with a reasonable overall structural design, which can effectively ensure the drying effect of the printing surface, the dried paper is not easily wrinkled, the paper transfer stability is good, and it is particularly suitable for the printing requirements of high-end products.
[0008] To solve the above technical problem, the technical solution of the present utility model is: an in-built drying type double-printing module single-sheet digital inkjet printer, including a paper feeding unit, a printing unit, and a paper receiving unit; the printing unit includes a front printing roller and a back printing roller, a first printing module is arranged above the front printing roller, and a second printing module is arranged above the back printing roller; a traction chain is arranged between the front printing roller and the back printing roller, the traction chain is sleeved on two driving sprockets, and gripper tooth rows are installed on the traction chain; a suction air shaping belt extending along the traction direction is arranged below the forward running section of the traction chain, a drying channel for the passing of the printing paper is formed between the forward running section of the traction chain and the forward running section of the suction air shaping belt, the forward running section of the traction chain and the forward running section of the suction air shaping belt run in the same direction and at the same speed, and a drying mechanism is arranged above the drying channel.
[0009] As one of the preferred technical solutions, a paper powder cleaning mechanism is arranged between the paper feeding unit and the printing unit.
[0010] As a preferred technical solution, the paper powder cleaning mechanism includes a first roller and a second roller. The first roller is connected to the paper output end of the paper feeding unit, and the second roller is respectively connected to the first roller and the front printing roller. A cleaning roller is rotatably installed above the first roller. A passage for the printing paper to pass through is formed between the surface of the cleaning roller and the surface of the first roller. When the printing paper passes through the passage, the roller surface of the cleaning roller contacts the surface of the printing paper.
[0011] As a preferred technical solution, a dust collection cover is provided on the periphery of the cleaning roller, and a suction port is provided on the dust collection cover.
[0012] As another preferred technical solution, a coating mechanism is provided between the paper feeding unit and the printing unit.
[0013] As a preferred technical solution, the coating mechanism includes a first roller and a second roller. The first roller is connected to the paper output end of the paper feeding unit, and the second roller is respectively connected to the first roller and the front printing roller. A first coating roller is rotatably installed above the first roller. A passage for the printing paper to pass through is formed between the surface of the first coating roller and the surface of the first roller. When the printing paper passes through the passage, the roller surface of the first coating roller contacts the surface of the printing paper. A second coating roller is cooperatively installed on the side of the first coating roller, and a metering roller is cooperatively installed on the side of the second coating roller. A liquid supply gap is formed between the second coating roller and the metering roller.
[0014] As a preferred technical solution, the metering roller is connected with a liquid supply gap adjusting mechanism.
[0015] As a preferred technical solution, the drying mechanism is arranged in the area between the forward section and the return section of the traction chain.
[0016] As a preferred technical solution, a third roller is provided between the traction chain and the reverse printing roller, and a fourth roller is provided between the reverse printing roller and the paper receiving unit.
[0017] As a preferred technical solution, the paper receiving unit includes a paper receiving chain, which has a vertical paper receiving section and a horizontal paper receiving section. A drying mechanism is also arranged on the transmission path of the paper receiving chain.
[0018] Compared with the prior art, the present utility model has at least the following beneficial effects:
[0019] (1) Through innovative structural design, a traction chain is arranged between the front printing cylinder and the back printing cylinder. Below the forward section of the traction chain, there is an air suction shaping belt extending along the traction direction. A drying channel for the printing paper to pass through is formed between the forward section of the traction chain and the forward section of the air suction shaping belt. The forward sections of the traction chain and the air suction shaping belt run in the same direction and at the same speed. A drying mechanism is arranged above the drying channel. In this way, when the paper completes the front printing operation, the paper is transferred from the front printing cylinder to the traction chain. The gripper jaw row on the traction chain grips the paper head, and the paper tail is adsorbed by the air suction shaping belt. The entire paper is fully stretched and adsorbed and shaped under the combined action of the gripper jaw row and the air suction shaping belt. During the process of the paper moving forward with the traction chain, the drying mechanism dries the ink on the fully stretched printed surface. In this way, the ink on the printed surface of the paper is not easily wrinkled after drying, greatly improving the printing accuracy and quality during reverse printing. At the same time, since the forward sections of the traction chain and the air suction shaping belt run in the same direction and at the same speed, during the paper transfer process, on the one hand, the contact surface between the paper and the air suction shaping belt will not be worn due to relative displacement, and on the other hand, it can also ensure the balance between the pulling force formed by the gripper jaw row on the paper and the adsorption force formed by the air suction shaping belt on the paper, thus ensuring the stability of paper transfer.
[0020] (2) For the first time, a paper powder cleaning mechanism is set on a single-sheet digital inkjet printer that uses cylinders to transfer paper. When the paper fed sheet by sheet through the paper feeding unit passes through the channel formed between the cleaning roller and the surface of the first cylinder, the roller surface of the cleaning roller rotates at high speed and is in instantaneous contact with the surface of the paper being conveyed forward synchronously. Under the action of high-speed airflow and friction, the paper powder on the surface of the paper and the paper fluff remaining at the edges of the paper can be quickly removed online. The desorbed paper powder and paper fluff are then centrally discharged to the outside through the dust collection hood. In this way, when the paper is transferred through the second cylinder and then reaches the front printing cylinder for printing operations, the surface of the paper that has been cleaned is exactly the printing surface, which can avoid the problem that the paper powder on the printing surface is lifted by the high-speed airflow and causes the inkjet head to be blocked by paper powder, thus effectively guaranteeing the print quality and efficient printing, and at the same time extending the service life of the inkjet head.
[0021] (3) For the first time, a coating mechanism is set on a single-sheet digital inkjet printer that uses cylinders to transfer paper. Different coating thicknesses can be achieved through the cooperation of the metering roller and the second coating roller. The first coating roller further distributes the coating liquid on the surface of the roller evenly. When the paper fed sheet by sheet through the paper feeding unit passes through the channel formed between the first coating roller and the surface of the first cylinder, the first coating roller can evenly coat the coating liquid on the surface of the paper, eliminating the need to set up a separate coating process and equipment, greatly improving the work efficiency and reducing the equipment investment and production costs. Description of the Drawings
[0022] The following drawings are only intended to illustrate and explain the present utility model, and do not limit the scope of the present utility model. Among them:
[0023] Figure 1 is a schematic structural view of the first embodiment of the present utility model;
[0024] Figure 2 is a state reference diagram when the paper is fully stretched, adsorbed and shaped under the combined action of the traction chain and the air suction shaping belt, and the drying mechanism dries the printing surface of the paper;
[0025] Figure 3 is a schematic structural view of the paper powder cleaning mechanism in the first embodiment of the present utility model;
[0026] Figure 4 is a schematic structural view of the second embodiment of the present utility model;
[0027] Figure 5 is a schematic structural view of the coating mechanism in the second embodiment of the present utility model.
[0028] In the figure: 10 - paper feeding unit; 11 - paper feeding table; 12 - paper conveying belt; 20 - printing unit; 21 - front printing roller; 22 - reverse printing roller; 23 - first printing module; 24 - second printing module; 25 - traction chain; 26 - driving sprocket; 27 - air suction shaping belt; 28 - third roller; 29 - fourth roller; 30 - paper receiving unit; 31 - paper receiving chain; 32 - paper receiving sprocket; 40 - paper powder cleaning mechanism; 41 - first roller; 42 - second roller; 43 - cleaning roller; 44 - dust collection hood; 45 - air suction port; 50 - drying mechanism; 60 - coating mechanism; 61 - first coating roller; 62 - second coating roller; 63 - metering roller; 64 - liquid supply gap adjusting mechanism. Specific Embodiments
[0029] The present utility model will be further described below in conjunction with the drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. It is understood that those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the drawings and description are illustrative in nature and are not used to limit the scope of protection of the claims.
[0030] Embodiment 1
[0031] As Figure 1As shown in the figure, the built-in drying type double-spray printing module single-sheet digital inkjet printer includes a paper feeding unit 10, a printing unit 20 and a paper receiving unit 30. In this embodiment, the paper feeding unit 10 includes a paper feeding table 11 and a paper conveying belt 12, and the paper receiving unit 30 includes a paper receiving chain 31 and a paper receiving sprocket 32. A paper receiving gripper row is installed on the paper receiving chain 31. The above structures are well-known and commonly used structures in the art and will not be elaborated here.
[0032] The printing unit 20 includes a front printing cylinder 21 and a back printing cylinder 22, and gripper rows for transferring and delivering paper are installed on both cylinders. A first printing module 23 is arranged above the front printing cylinder 21, and a second printing module 24 is arranged above the back printing cylinder 22. A traction chain 25 is arranged between the front printing cylinder 21 and the back printing cylinder 22. The traction chain 25 is sleeved on two driving sprockets 26, and gripper rows for transferring and delivering paper are installed on the traction chain 25 to extend the paper transfer path through the traction chain 25. Below the forward section of the traction chain 25, there is an air suction shaping belt 27 extending along the traction direction. A drying channel for the printing paper to pass through is formed between the forward section of the traction chain 25 and the forward section of the air suction shaping belt 27. The forward section of the traction chain 25 and the forward section of the air suction shaping belt 27 run in the same direction and at the same speed, and a drying mechanism 50 is arranged above the drying channel.
[0033] Reference Figure 2 As shown in the figure, when the paper completes the front printing operation, the paper is transferred from the front printing cylinder 21 to the traction chain 25. The gripper row on the traction chain 25 grips the paper head, and the paper tail is adsorbed by the air suction shaping belt 27. The whole paper is fully stretched and adsorbed and shaped under the combined action of the traction force of the gripper row on the traction chain 25 and the adsorption force of the air suction shaping belt 27. During the forward movement of the paper along with the traction chain 25, the drying mechanism 50 dries the ink on the fully stretched printed surface. In this way, the ink on the printed surface of the paper is not easily wrinkled after drying, greatly improving the printing accuracy and quality when the paper reaches the back printing cylinder 22 for back printing. At the same time, since the forward section of the traction chain 25 and the forward section of the air suction shaping belt 27 run in the same direction and at the same speed, during the paper transfer process, on the one hand, the contact surface between the paper and the air suction shaping belt 27 will not be worn due to relative displacement, and on the other hand, it can also ensure the balance between the pulling force formed by the gripper row on the paper and the adsorption force formed by the air suction shaping belt on the paper, thus ensuring the stability of paper transfer.
[0034] In this embodiment, the drying mechanism 50 is a drying box equipped with heating tubes. To effectively save occupied space and improve drying efficiency, the drying mechanism 50 is arranged in the area between the forward section and the return section of the traction chain 25. Of course, the drying mechanism 50 can also adopt other drying methods such as hot air drying, which should all fall within the protection scope of the present utility model. The air suction shaping belt 27 can be realized by an air suction belt with a smooth surface and evenly distributed air suction holes to achieve its corresponding functions.
[0035] In this embodiment, a paper powder cleaning mechanism 40 is installed between the paper feeding unit 10 and the printing unit 20. Refer to Figure 3 , the paper powder cleaning mechanism 40 includes a first roller 41 and a second roller 42. The first roller 41 is connected to the paper output end of the paper feeding unit 10, and the second roller 42 is respectively connected to the first roller 41 and the front printing roller 21. Gripper jaw rows for gripping and transferring the paper are respectively installed on the first roller 41, the second roller 42, and the front printing roller 21; A cleaning roller 43 is rotatably installed above the first roller 41. A channel for a single sheet of paper to pass through is formed between the surface of the cleaning roller 43 and the surface of the first roller 41. When the paper passes through the channel, the roller surface of the cleaning roller 43 contacts the surface of the paper.
[0036] Refer to again Figure 3 , a dust collection cover 44 is provided on the periphery of the cleaning roller 43. An air suction port 45 is opened on the dust collection cover 44. The air suction port 45 is connected to a negative pressure fan. Through the dust collection cover 44, it is convenient to centrally collect and discharge the paper powder and paper fluff detached from the paper surface to the outside, avoiding the problem that the paper powder or paper fluff re-aggregates and settles on the paper surface to form secondary pollution.
[0037] The specific working principle of this paper powder cleaning mechanism is as follows: The papers are successively output one by one from the paper feeding unit 10. After the paper head of the paper is gripped by the gripper jaw row on the first roller 41, the paper adheres to the surface of the first roller 41 and rotates with the roller. When the paper passes through the channel formed between the surface of the cleaning roller 43 and the surface of the first roller 41, the high-speed rotating roller surface of the cleaning roller 43 is instantaneously in contact with the surface of the paper being conveyed forward synchronously. Under the action of the high-speed air flow and the friction, the paper powder on the paper surface and the paper fluff remaining at the edge of the paper can be quickly removed online. The detached paper powder and paper fluff are then centrally discharged to the outside through the dust collection cover 44. In this way, when the paper is transferred through the second roller 42 and reaches the front printing roller 21 for printing operations, the surface of the paper that has been cleaned is exactly the printing surface, which can avoid the problem that the paper powder on the printing surface is lifted by the high-speed air flow and causes the inkjet head to be blocked by the paper powder, thus effectively guaranteeing the print quality and high-efficiency printing, and at the same time extending the service life of the inkjet head.
[0038] The cleaning roller 43 is preferably a brush roller, and its rotation direction is the same as that of the first roller 41. In this way, when the paper passes through the channel between the cleaning roller 43 and the first roller 41, the paper conveying direction is opposite to the rotation and wiping direction of the cleaning roller 43. On the one hand, it can increase the relative linear velocity of the contact surface between the paper and the cleaning roller 43, thus forming an "air knife" effect to accelerate the separation of the paper powder on the paper surface, and further improve the cleaning effect of the paper surface. On the other hand, the rotation and wiping direction is from the paper head end to the paper tail end. After the paper head end is held by the gripper bar, the paper will not form wrinkles due to friction.
[0039] In this embodiment, a third roller 28 is provided between the traction chain 25 and the reverse printing roller 22. The third roller 28 is located at the lower left side of the reverse printing roller 22. A fourth roller 29 is provided between the reverse printing roller 22 and the delivery chain 31. The fourth roller 29 is located at the lower right side of the reverse printing roller 22. The delivery chain 31 has a vertical delivery section and a horizontal delivery section. Through this layout method, the equipment occupied space can be saved to the greatest extent on the basis of realizing an effective drying path.
[0040] In this embodiment, a drying mechanism 50 is also provided on the transmission path of the delivery chain 31 (either at the vertical delivery section or the horizontal delivery section). The drying operation of the ink on the reverse printing side of the paper can be conveniently realized through the drying mechanism 50 installed at this place.
[0041] Embodiment 2
[0042] Reference Figure 4 , the structural principle of this embodiment is basically the same as that of Embodiment 1, and the same parts will not be described again. The only difference is that in this embodiment, a coating mechanism 60 is installed between the paper feeding unit 10 and the printing unit 20, which replaces the paper powder cleaning mechanism in Embodiment 1 to meet the high-end printing requirements of different models and different papers.
[0043] Reference Figure 5The coating mechanism 60 includes a first roller 41 and a second roller 42. The first roller 41 is connected to the paper output end of the paper feeding unit 10, and the second roller 42 is connected to the first roller 41 and the front printing roller 21 respectively. The first roller 41, the second roller 42 and the front printing roller 21 are respectively equipped with a paper gripping tooth row for biting the transferred paper; a first coating roller 61 is rotatably installed above the first roller 41, and a channel for a single paper to pass through is formed between the first coating roller 61 and the surface of the first roller 41. When the paper passes through the channel, the roller surface of the first coating roller 61 contacts the surface of the paper; a second coating roller 62 (preferably a hard rubber roller) is installed on the side of the first coating roller 61, and a metering roller 63 (preferably a rubber roller) is installed on the side of the second coating roller 62, and a liquid supply gap D is formed between the second coating roller 62 and the metering roller 63.
[0044] The metering roller 63 is connected to a liquid supply gap adjustment mechanism 64, and the distance between the metering roller 63 and the second coating roller 62 is adjusted by the liquid supply gap adjustment mechanism 64, so that different coating thicknesses of the coating can be achieved. During the coating operation, the coating liquid is transported to the liquid supply gap by the conveying mechanism, and as the second coating roller 62 rotates, the coating liquid is coated on the surface of the second coating roller 62, and the second coating roller 62 transfers the coating liquid to the first coating roller 61, which can further evenly distribute the coating liquid on the roller surface and improve the axial and radial uniformity. In this way, when the paper fed one by one by the paper feeding unit passes through the channel formed between the first coating roller 61 and the surface of the first drum 41, the first coating roller 61 evenly coats the coating liquid on the surface of the paper, and there is no need to set up a separate coating process and equipment, which greatly improves the work efficiency and reduces the equipment investment and production costs.
[0045] To sum up, the overall structural design of the utility model is reasonable. Through the cooperation of the traction chain and the suction shaping belt, it can effectively ensure the drying effect of the printed surface and the dried paper is not easy to wrinkle. The paper transfer stability is good. At the same time, it can take into account the online cleaning or coating function of paper powder. It is particularly suitable for the high-quality printing needs of high-end products.
[0046] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.
Claims
1. A sheet-fed digital inkjet printer with built-in drying dual-printing modules, comprising a paper feeding unit, a printing unit and a paper receiving unit; characterized in that: The printing unit includes a front printing roller and a back printing roller, a first printing module is arranged above the front printing roller, and a second printing module is arranged above the back printing roller; a traction chain is arranged between the front printing roller and the back printing roller, the traction chain is mounted on two driving sprockets, and a paper gripper row is installed on the traction chain; a suction shaping belt extending along the traction direction is arranged below the front section of the traction chain, and a drying channel for the printing paper to pass through is formed between the front section of the traction chain and the front section of the suction shaping belt, the front section of the traction chain and the front section of the suction shaping belt run in the same direction and at the same speed, and a drying mechanism is arranged above the drying channel.
2. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 1, characterized in that: A paper powder cleaning mechanism is arranged between the paper feeding unit and the printing unit.
3. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 2, characterized in that: The paper powder cleaning mechanism includes a first roller and a second roller, the first roller is connected to the paper output end of the paper feeding unit, and the second roller is respectively connected to the first roller and the front printing roller; a cleaning roller is rotatably installed above the first roller, and a channel for the printing paper to pass through is formed between the cleaning roller and the surface of the first roller, and when the printing paper passes through the channel, the roller surface of the cleaning roller contacts the surface of the printing paper.
4. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 3, characterized in that: The peripheral side cover of the cleaning roller is provided with a dust collecting cover, and the dust collecting cover is provided with an air suction port.
5. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 1, characterized in that: A coating mechanism is arranged between the paper feeding unit and the printing unit.
6. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 5, characterized in that: The coating mechanism includes a first roller and a second roller, the first roller is connected to the paper output end of the paper feeding unit, and the second roller is connected to the first roller and the front printing roller respectively; a first coating roller is rotatably installed above the first roller, and a channel for the printing paper to pass through is formed between the first coating roller and the surface of the first roller, and when the printing paper passes through the channel, the roller surface of the first coating roller contacts the surface of the printing paper; a second coating roller is installed on the side of the first coating roller, and a metering roller is installed on the side of the second coating roller, and a liquid supply gap is formed between the second coating roller and the metering roller.
7. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 6, characterized in that: The metering roller is connected with a liquid supply gap adjustment mechanism.
8. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 1, characterized in that: The drying mechanism is arranged in the area between the forward section and the return section of the traction chain.
9. The built-in drying type double-printing module sheet-fed digital inkjet printer according to any one of claims 1 to 8, characterized in that: A third roller is arranged between the traction chain and the reverse side printing roller, and a fourth roller is arranged between the reverse side printing roller and the paper receiving unit.
10. The built-in drying type double-printing module sheet-fed digital inkjet printer according to claim 9, characterized in that: The paper receiving unit comprises a paper receiving chain, wherein the paper receiving chain has a vertical paper receiving section and a horizontal paper receiving section, and a drying mechanism is also arranged on the conveying path of the paper receiving chain.