Duplex inkjet printer for printing on special materials

Abstract

This invention relates to a duplex inkjet printer for printing on special materials, specifically in the field of inkjet printing technology. A printing station is provided on the conveying mechanism, allowing printing on both the top and bottom sides of the object to be printed. Moving printing mechanisms are located above and below the printing station. Each moving printing mechanism includes a printing component, a moving component, and two curing lamps. The two moving components drive their respective printing components to move, and the two printing components respectively perform inkjet printing on both the top and bottom sides of the object. The curing lamps then use ultraviolet light to cure the ink sprayed onto the object by the two printing components, thus achieving simultaneous duplex printing. This invention enables simultaneous duplex printing of the material, significantly improving printing efficiency and effectively solving the problems of low duplex printing efficiency and pattern alignment difficulties in existing technologies.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing on special materials, in particular to an inkjet printer for double-sided printing of special materials such as building decoration materials. BACKGROUND

[0002] Acrylic, metal and other materials are often used to make building decoration materials, such as walls, ceiling, partitions, etc. In order to serve as decoration, it is often necessary to print text or patterns on them. Inkjet printers can be used to print patterns or text on these decoration materials made of acrylic, metal and other materials.

[0003] After printing, the inkjet printer needs to use a UV lamp to irradiate and quickly cure the ink. Currently, due to the difference between acrylic, metal and other special materials and paper, they cannot be bent basically. The printer of the prior art can only print on one side during printing. This means that for materials that need to be printed on both sides, the operator must print on each side separately, resulting in low overall efficiency. This single-sided printing method not only consumes a lot of time, but also during the material turning and positioning process, it is difficult to control accurately, which can easily cause the patterns on the two sides to be misaligned, thereby seriously affecting the final printing quality. Therefore, the printer of the prior art has the problems of low efficiency and difficulty in aligning patterns in double-sided printing, and there is an urgent need for an inkjet printing solution that can achieve double-sided printing at the same time and effectively solve the above defects. SUMMARY

[0004] The present application aims to solve the technical problems of low efficiency and difficulty in aligning patterns in double-sided printing of the existing inkjet printer, and provides an inkjet printer that can print on both sides of the material at the same time.

[0005] The double-sided printing inkjet printer for printing special materials provided by the present application comprises:

[0006] A conveying mechanism comprising a conveying member for conveying a to-be-printed object, the conveying mechanism further comprising a printing station, and the to-be-printed object is located at the printing station and can be printed on both the upper and lower surfaces;

[0007] A moving printing device comprising two moving printing mechanisms respectively arranged above and below the printing station, each moving printing mechanism comprising a printing assembly, a moving assembly and two curing lamps, the two curing lamps being arranged on both sides of the printing assembly, the two moving assemblies driving the respective printing assemblies to move, and the two printing assemblies performing inkjet printing on the upper and lower surfaces of the to-be-printed object, and each curing lamp irradiating and curing the ink on the to-be-printed object with ultraviolet light, thereby achieving double-sided printing at the same time.

[0008] The printing device further comprises a telescopic clamping mechanism, which comprises two telescopic clamping assemblies arranged above and below the printing station respectively, each of the telescopic clamping assemblies comprises a telescopic assembly and a clamping member, and the two telescopic assemblies drive the clamping members connected thereto to extend towards each other to jointly clamp the object to be printed located in the printing station, so that the printing nozzles of the two printing assemblies are kept at a consistent distance from the object to be printed.

[0009] The telescopic clamping mechanism comprises two groups, each group comprises two telescopic clamping assemblies arranged above and below the printing station respectively between the printing assemblies and the curing lamp, the two moving assemblies drive the respective printing assemblies to move synchronously, the two clamping members located at the front end of the moving direction of the printing assemblies extend towards each other to jointly clamp the object to be printed located in the printing station, so that the printing nozzles of the two printing assemblies are kept at a consistent distance from the object to be printed; the two clamping members located at the rear end of the moving direction of the printing assemblies retract away from the object to be printed located in the printing station to avoid contacting the ink that has not been cured by the curing lamp.

[0010] The printing device further comprises two shielding assemblies arranged close to the two side edges of the object to be printed respectively, which are used to shield the ink sprayed by the two printing assemblies from each other or the ink splashed.

[0011] Each of the shielding assemblies comprises a shielding cylinder and a shielding member, and the shielding cylinder drives the shielding member to closely contact the edge of the object to be printed located in the printing station.

[0012] The printing device further comprises a gas jet device, which comprises two groups of gas jet assemblies, each group of the gas jet assemblies comprises two gas jet heads arranged on the same side of the printing mechanism, and the two gas jet heads on the same side are arranged vertically and spray gas towards the object to be printed respectively, so that the object to be printed that is no longer clamped by the clamping members can still maintain its vertical position in the printing station.

[0013] Each of the printing mechanisms is provided with a plurality of gas jet heads on the same side, and the gas jet heads on the same side are connected, and the two printing assemblies drive the connected plurality of gas jet heads to move so that each gas jet head covers the width of the object to be printed, thereby maintaining the vertical position of the object to be printed in the printing station.

[0014] The air jet device further comprises four adjusting springs and two air jet sliding rails, the two air jet sliding rails are arranged above and below the printing station respectively, each air jet head is slidable along the corresponding air jet sliding rail through a sliding block, two adjacent air jet heads on the same side are connected through a telescopic connecting rod, the outer air jet heads of each group of connected air jet heads are connected with the adjusting springs respectively, the inner air jet heads of each group of connected air jet heads are fixedly connected with one side of the corresponding printing assembly, the printing assembly drives the connected air jet heads to move along the air jet sliding rail, and the adjusting springs provide elastic force to make the air jet heads on the same side be distributed at intervals.

[0015] The air outlet holes of the air jet heads are in a porous structure.

[0016] Each group of air jet assemblies further comprises two magnetic materials with different magnetic properties, and the two magnetic materials with different magnetic properties are arranged on each pair of air jet heads corresponding in the upper and lower positions respectively, so as to ensure that the air jet heads corresponding in the upper and lower positions are arranged in a facing manner.

[0017] The beneficial effects of the present application are as follows: the printing station is arranged on the conveying mechanism, the upper and lower surfaces of the object to be printed can be printed, the moving printing mechanism is arranged above and below the printing station, each moving printing mechanism comprises a printing assembly, a moving assembly and two curing lamps, the two moving assemblies drive the respective printing assemblies to move, the two printing assemblies print the upper and lower surfaces of the object to be printed respectively, and the curing lamps irradiate the ink on the object to be printed with ultraviolet light, so that the double-sided printing is realized. The double-sided printing of the object to be printed can be realized, the printing efficiency is improved, and the problems of low printing efficiency and difficult pattern alignment in the prior art are solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the structure of the inkjet printer of the present application.

[0019] Figure 2 is a schematic diagram of the structure of the inkjet printer of the present application.

[0020] Figure 3 is a schematic diagram of the structure of the inkjet printer of the present application.

[0021] Figure 4 is a schematic diagram of the structure of the inkjet printer of the present application.

[0022] Figure 5 is a schematic diagram of the structure of the inkjet printer of the present application.

[0023] Figure 6 is a schematic diagram of the structure of the inkjet printer of the present application. Figure 5 is a partial enlarged view of A in the schematic diagram of the structure of the inkjet printer of the present application.

[0024] Figure 7 This is a structural diagram of the mobile printing device and the jet device from another angle.

[0025] Figure 8 yes Figure 7 A magnified view of part B in the image.

[0026] The diagram includes:

[0027] 1. Conveying mechanism; 11. First conveying component; 12. Second conveying component; 13. Conveying mounting frame; 14. Printing station.

[0028] 2. Mounting base; 21. Lifting pressure roller mechanism; 211. Lifting frame; 212. Pressure roller; 213. Lifting cylinder.

[0029] 3. Mobile printing device; 31. Mobile printing mechanism; 311. Printing component; 3111. Printing nozzle; 312. Mobile component; 3121. Printing beam; 3122. Printing slide rail; 3123. Printing slider; 3124. Motor; 3125. Synchronous belt; 313. Curing lamp.

[0030] 4. Telescopic clamping assembly; 41. Telescopic assembly; 42. Clamping element (roller).

[0031] 51. Cylinder shield; 52. Shielding component;

[0032] 6. Jet jet device; 61. Jet nozzle; 62. Adjusting spring; 63. Jet jet slide rail; 64. Fixing block; 65. Telescopic linkage; 66. Irregular magnetic material.

[0033] 7. The object to be printed. Detailed Implementation

[0034] The invention will be described in detail below with reference to specific embodiments.

[0035] This embodiment provides an inkjet printer, such as... Figures 1 to 3 As shown, the device includes a conveying mechanism 1, a mounting base 2, and a mobile printing device 3 mounted on the mounting base 2. The conveying mechanism 1 includes a conveying mounting frame 13, a first conveying component 11, and a second conveying component 12. Both the first conveying component 11 and the second conveying component 12 are mounted on the conveying mounting frame 13. A printing station 14 is provided between the first conveying component 11 and the second conveying component 12. The object to be printed 7 is conveyed forward by the first conveying component 11 and the second conveying component 12 in sequence. When the object to be printed 7 is located at the printing station 14, both the upper and lower sides of the object to be printed can be printed.

[0036] like Figure 4 and Figure 6As shown, the mobile printing device 3 includes two sets of mobile printing mechanisms 31, respectively positioned above and below the printing station 14. Each set of mobile printing mechanisms 31 includes a printing component 311, a moving component 312, and two curing lamps 313. The two curing lamps 313 are symmetrically distributed on both sides of the printing component 311. The moving component 312 drives the printing component 311 to move, enabling it to simultaneously perform inkjet printing on the upper and lower surfaces of the object to be printed 7. At the same time, the curing lamps 313 instantly cure the ink by irradiating it with ultraviolet light. Through this simultaneous printing and curing on both sides, efficient double-sided printing of the object to be printed 7 is achieved.

[0037] Specifically, such as Figure 4 As shown, each moving component 312 includes a printing beam 3121, a printing slide rail 3122, a printing slider 3123, a motor 3124, and a synchronous belt 3125. The printing beam 3121 below the printing station 14 is fixedly connected to the mounting base 2. The length of the printing beam 3121 is greater than the width of the conveyor. The printing slide rail 3122 is fixedly connected along the length of the printing beam 3121. The printing slider 3123 can slide along the printing slide rail 3122. The printing slider 3123 is connected to the printing component 311. The motor 3124 is located at one end of the printing beam 3121. The rotating end of the motor 3124 drives the printing slider 3123 to slide back and forth along the printing slide rail 3122 through the synchronous belt 3125, so that the printing component 311 performs inkjet printing on the object 7 to be printed. Preferably, the rotating end of the motor 3124 simultaneously drives the synchronous belts 3125 above and below the printing station 14 to rotate, thereby driving the two printing components 311 to move synchronously and reducing the use of one motor 3124, thus simplifying the structure.

[0038] like Figure 1As shown, the mounting seat 2 is also provided with a lifting pressure roller mechanism 21, which includes a lifting frame 211, two pressure rollers 212 arranged on the lifting frame 211, and four lifting cylinders 213, wherein two of the lifting cylinders 213 are arranged on the left and right sides of the first conveying member 11 near the printing station 14, and the other two lifting cylinders 213 are arranged on the left and right sides of the second conveying member 12 near the printing station 14, the lifting ends of the four lifting cylinders 213 are all connected to the lifting frame 211, and the two pressure rollers 212 are arranged above the first conveying member 11 and the second conveying member 12 near the printing station 14, respectively; the two pressure rollers 212 are used to press against the to-be-printed object 7 conveyed forward by the first conveying member 11 and the second conveying member 12, so as to avoid the to-be-printed object 7 from jumping during the forward conveying process; and the four lifting cylinders 213 can jointly adjust the distance between the pressure roller 212 and the first conveying member 11 and the second conveying member 12, so as to adapt to to-be-printed objects 7 of different thicknesses. The lifting frame 211 can also be fixedly connected to a printing cross beam 3121 located above the printing station 14, so that the four lifting cylinders 213 can also jointly adjust the distance between the upper printing assembly 311 and the to-be-printed object 7.

[0039] When the to-be-printed object 7 is a relatively thin acrylic plate or paperboard or other materials with relatively low hardness, the to-be-printed object 7 in the printing station 14 may be bent due to its own gravity, or may swing up and down due to the airflow caused by the back-and-forth movement of the printing assembly 311, so that the to-be-printed object 7 and the printing assembly 311 may come into contact and scratch each other. In order to solve the above technical problem, in the embodiment, as shown in Figure 7 and Figure 8 each printing assembly 311 and the curing lamp 313 on the left and right sides are provided with a telescopic clamping assembly 4, and each telescopic clamping assembly 4 includes a telescopic assembly 41 and a clamping piece 42, the two telescopic assemblies 41 arranged above and below drive the clamping pieces 42 connected thereto to move towards each other to jointly clamp the to-be-printed object 7 in the printing station 14, so that the distances between the printing heads 3111 of the two printing assemblies 311 and the to-be-printed object 7 remain consistent. This is particularly important for printing relatively thin acrylic plates or paperboards or other materials with relatively low hardness, and can effectively prevent the to-be-printed object 7 from swinging due to its own gravity or the influence of airflow, thereby preventing the to-be-printed object 7 and the printing assembly 311 from coming into contact and scratching each other, and providing a stable basis for subsequent inkjet printing.

[0040] Since the inkjet printer needs to be irradiated and cured by the ultraviolet light of the curing lamp 313 after the printing assembly 311 sprays ink, the immediate clamping of the clamping piece 42 may cause the ink to not be fully cured, resulting in blurred patterns and affecting the printing quality. Therefore, as shown in Figure 5 and Figure 6As shown, the two moving assemblies 312 above and below the printing station 14 drive the respective printing assemblies 311 to move synchronously, the two clamping pieces 42 on the side of the front end of the moving direction of the printing assemblies 311 extend towards each other to jointly clamp the object 7 to be printed located in the printing station 14, so that the printing nozzles 3111 of the two printing assemblies 311 keep consistent distance from the object 7 to be printed; the two clamping pieces 42 on the side of the rear end of the moving direction of the printing assemblies 311 retract away from each other so as not to clamp the object 7 to be printed located in the printing station 14, so as to avoid contacting the ink which has not been cured by the curing lamp 313. By setting the clamping pieces 42 on the left and right sides of the printing assemblies 311 in a retractable form, when the two printing assemblies 311 move synchronously to the left, the two clamping pieces 42 on the left side extend towards each other to jointly clamp the object 7 to be printed, while the two clamping pieces 42 on the right side retract away from each other; when the two printing assemblies 311 move synchronously to the right, the two clamping pieces 42 on the right side extend towards each other to jointly clamp the object 7 to be printed, while the two clamping pieces 42 on the left side retract away from each other, so as to avoid the clamping pieces 42 contacting the printing surface immediately after printing, thereby affecting the printing quality. Preferably, the retractable assembly 41 is a retractable air cylinder, and the clamping piece 42 is a roller 42, so that the use of the roller 42 can reduce the friction between the roller 42 and the object 7 to be printed, so that the printing assembly 311 moves more smoothly.

[0041] As shown in Figure 7 and Figure 8 When the upper and lower printing assemblies 311 need to print the two side edges of the object 7 to be printed, part or all of the printing nozzles 3111 of the two printing assemblies 311 will be away from the object 7 to be printed in the vertical direction, that is, the upper and lower printing nozzles 3111 will face each other, at this time, the two printing nozzles 3111 may spray ink to each other, or the un-cured ink may splash to the opposite printing nozzle 3111 due to the influence of gravity or air flow, thereby causing the printing nozzle 3111 to be blocked by ink. As shown in Figure 2 、 Figure 7 and Figure 8 The inkjet printer of the present application further comprises two shielding assemblies, the two shielding assemblies are respectively close to the two side edges of the object 7 to be printed, so that when the two printing nozzles 3111 face each other, the shielding assemblies can shield the ink sprayed by the two printing nozzles 3111 to each other, thereby protecting the cleanliness of the two printing nozzles 3111. Preferably, each shielding assembly comprises a shielding air cylinder 51 and a shielding piece 52, the shielding air cylinder 51 drives the shielding piece 52 to be close to the edge of the object 7 to be printed located in the printing station 14. By driving the movement of the shielding piece 52 through the shielding air cylinder 51, different widths of the object 7 to be printed can be adapted.

[0042] As shown in Figure 8As shown, when the two printing assemblies 311 move to the left edge of the object 7 to be printed, the two rollers 42 on the left side of the two printing assemblies 311 have been projected in the vertical direction away from the object 7 to be printed, and the two rollers 42 on the right side of the two printing assemblies 311 have also been in a state of no longer clamping the object 7 to be printed (to avoid clamping the uncured ink), i.e., the object 7 to be printed is no longer clamped. In this way, when the object 7 to be printed is a relatively thin acrylic plate or paperboard or other material with low hardness, the object 7 to be printed may sag and bend due to its own gravity at the printing station 14, or the object 7 to be printed may swing up and down due to the airflow caused by the back-and-forth movement of the printing assemblies 311, so that the object 7 to be printed and the printing assemblies 311 may come into contact and scratch each other, and the left shielding member 52 and the edge of the object 7 to be printed may also be misaligned up and down, so that the uncured ink may splash to the opposite printing head 3111 due to the influence of gravity or airflow, thereby causing the printing head 3111 to be blocked by ink. When the two printing assemblies 311 move synchronously from left to right to the right edge of the object 7 to be printed, the same technical problem will also be faced. In order to solve this technical problem, as shown in Figure 2 , the inkjet printer further comprises an air jet device 6, in combination with Figure 7 and Figure 8 , the air jet device 6 comprises four air jet heads 61 respectively arranged on the left and right outer sides of the two printing mechanisms, and the air jet heads 61 arranged on the same side in a one-to-one correspondence form an air jet assembly, so that the two air jet heads 61 on the same side are arranged in a vertical direction and respectively spray gas towards the object to be printed, so that the object 7 to be printed, which is no longer clamped by the rollers 42, can still maintain its vertical position in the printing station 14. After the object 7 to be printed is no longer clamped by the rollers 42, the stability of maintaining its vertical position in the printing station 14 is maintained through the dynamic support of the airflow, so as to avoid the object 7 to be printed from sagging due to gravity or swinging up and down due to the airflow of the printing assemblies 311, causing the object 7 to be printed to come into contact with the printing head 3111 and scratch each other, or causing the ink to splash to the opposite printing head 3111 due to unstable position, thereby ensuring the stability during printing and the cleanliness of the printing head 3111.

[0043] Preferably, as shown in Figure 5 , Figure 7 , Figure 8As shown, each printing mechanism is provided with multiple air jet heads 61 on the same side, and the multiple air jet heads 61 on the same side are connected, and the two printing assemblies 311 drive the multiple air jet heads 61 connected thereto to move to cover the width of the object 7 to be printed, so as to maintain the vertical position of the object 7 to be printed in the printing station 14. The air jet device 6 further comprises four adjusting springs 62 and two air jet sliding rails 63, and the two air jet sliding rails 63 are respectively arranged above and below the printing station 14. Specifically, the two ends of each printing beam 3121 are respectively fixedly connected with a fixed block 64, and the two ends of each air jet sliding rail 63 are respectively fixedly connected with two fixed blocks 64. Each air jet head 61 is slidably connected with the corresponding air jet sliding rail 63 through a sliding block. The two adjacent air jet heads 61 on the same side are connected through a telescopic connecting rod 65. One end of each adjusting spring 62 is fixedly connected with the corresponding fixed block 64, and the other end thereof is fixedly connected with the outermost air jet head 61 of each group of connected air jet heads 61. The inner air jet heads 61 of each group of connected air jet heads 61 are fixedly connected with one side of the corresponding printing assembly 311, and the printing assembly 311 drives the multiple air jet heads 61 connected thereto to move along the air jet sliding rail 63. The adjusting spring 62 provides elastic force to make the multiple air jet heads 61 on the same side be distributed at intervals. The adjacent air jet heads 61 are connected through the telescopic connecting rod 65 to form a telescopic linkage structure. When the printing assembly 311 drives the air jet device 6 to move, the air jet heads 61 can be telescoped and moved as a whole while maintaining the interval distribution through the cooperation of the connecting rod and the sliding block. In addition, the overall length of the air jet device 6 can be effectively shortened, so as to reduce the space occupied by the inkjet printer.

[0044] In this embodiment, the air outlet holes of the air jet heads 61 are designed in a multi-hole shape. This multi-hole design can disperse the air flow, avoid damage to the just sprayed ink due to high pressure of a single hole, and prevent the flow of excessive air flow from disturbing the ink trajectory during inkjet.

[0045] In this embodiment, as shown in Figure 6 and Figure 8 As shown, each group of air jet assemblies further comprises two different magnetic materials 66, and the two different magnetic materials 66 are respectively arranged on each pair of air jet heads 61 corresponding in upper and lower positions to ensure that the air jet heads 61 corresponding in upper and lower positions are directly opposite. This magnetic attraction design can ensure that the air jet heads 61 corresponding in upper and lower positions are always accurately aligned during telescoping or moving, so as to further optimize the air jet effect and avoid negative effects caused by inaccurate alignment.

[0046] Specific operation process and working principle of the inkjet printer:

[0047] Firstly, the object to be printed 7 is placed at the starting end of the conveying mechanism 1, the first conveying member 11 and the second conveying member 12 of the conveying mechanism 1 work to drive the object to be printed 7 to move forward smoothly until it reaches the printing station 14. In this process, the lifting and pressing roller mechanism 21 is started, and the pressing roller 212 is lifted by the lifting cylinder 213 to press on the object to be printed 7 in the conveying process to prevent it from jumping due to inertia or vibration. When the object to be printed 7 is accurately positioned at the printing station 14, both the upper and lower surfaces are ready for printing.

[0048] Before the printing operation starts, in order to ensure that the printing nozzle 3111 of the printing assembly 311 maintains a precise distance from the surface of the object to be printed 7, the two groups of telescopic clamping assemblies 4 of the telescopic clamping mechanism start to work. The telescopic assemblies 41 above and below the printing station 14 drive the connected rollers 42 to extend forward, and together roll and clamp the object to be printed 7 at the printing station 14. At the same time, the shielding members 52 are driven by the two shielding cylinders 51 to move and tightly adhere to the two side edges of the object to be printed 7. At the same time, a plurality of gas injection heads 61 are all directed at the object to be printed 7 to maintain the stability of the vertical position of the object to be printed 7 in the printing station 14 through the dynamic support of the gas flow.

[0049] When the printing operation starts, the two mobile printing mechanisms 31 above and below the printing station 14 are simultaneously started. The mobile assemblies 312 inside drive the printing assemblies 311 to move back and forth along the length direction of the printing beam 3121 (the printing direction). The plurality of gas injection heads 61 connected on the same side of each printing mechanism are connected by telescopic connecting rods 65, and each gas injection head 61 slides along the gas injection slide rail 63 through a sliding block, and the adjusting spring 62 provides a spring force to keep the adjacent gas injection heads 61 evenly distributed, so that each gas injection head 61 covers the width of the object to be printed 7, ensuring full gas flow support for the object to be printed 7 at the printing station. The printing assembly 311 performs inkjet printing on the object to be printed 7 during the movement to realize synchronous pattern output on the upper and lower surfaces. The curing lamp 313 immediately follows the printing assembly 311 to irradiate the ink on the object to be printed 7 with ultraviolet light to ensure that the ink adheres and cures quickly, preventing ink spreading or blurring.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A double-sided inkjet printer for printing on special materials, characterized in that, The application relates to a printing device for printing on both sides of an object, comprising: a conveying mechanism including a conveying member for conveying the object to be printed, the conveying mechanism being further provided with a printing station, the object to be printed being located on the printing station and capable of being printed on both sides; a moving printing device including two moving printing mechanisms respectively arranged above and below the printing station, each of the moving printing mechanisms including a printing assembly, a moving assembly and two curing lamps, the two curing lamps being respectively arranged on both sides of the printing assembly, the two moving assemblies respectively driving the printing assemblies to move, the two printing assemblies respectively performing inkjet printing on the upper and lower sides of the object to be printed, and each of the curing lamps performing ultraviolet light irradiation and curing on the ink jetted on the object to be printed by the two printing assemblies, so that the object to be printed is printed on both sides at the same time; the device further comprising a telescopic clamping mechanism including two telescopic clamping assemblies respectively arranged above and below the printing station, each of the telescopic clamping assemblies including a telescopic assembly and a clamping member, the two telescopic assemblies respectively driving the clamping members connected thereto to extend towards each other to jointly clamp the object to be printed located on the printing station, so that the printing nozzles of the two printing assemblies are kept at a consistent distance from the object to be printed; the telescopic clamping mechanism being provided with two groups, each group including two telescopic clamping assemblies, the telescopic clamping assemblies being respectively arranged between the printing assemblies and the curing lamps above and below the printing station, the two moving assemblies driving the printing assemblies to move synchronously, the two clamping members located on one side of the front end of the moving direction of the printing assemblies extending towards each other to jointly clamp the object to be printed located on the printing station, so that the printing nozzles of the two printing assemblies are kept at a consistent distance from the object to be printed; the two clamping members located on one side of the rear end of the moving direction of the printing assemblies retracting away from each other to no longer clamp the object to be printed located on the printing station, so as to avoid contacting the ink not yet cured by the curing lamps; the device further comprising an air jet device including two groups of air jet assemblies, each of the groups of air jet assemblies including two air jet heads respectively arranged on the same side of the two printing mechanisms, the two air jet heads on the same side being arranged in a vertical manner and respectively jetting air towards the object to be printed, so that the object to be printed no longer clamped by the clamping members can still maintain its vertical position in the printing station.

2. The inkjet printer according to claim 1, characterized by the device further comprising two shielding assemblies, the two shielding assemblies respectively abutting the two side edges of the object to be printed, the shielding assemblies being used to shield the ink jetted or splashed by the two printing assemblies when the printing nozzles of the two printing assemblies jet ink towards each other.

3. The inkjet printer according to claim 2, characterized by each of the shielding assemblies including a shielding cylinder and a shielding member, the shielding cylinder driving the shielding member to abut the edge of the object to be printed located on the printing station.

4. The inkjet printer according to claim 1, characterized by each of the printing mechanisms being provided with a plurality of air jet heads on the same side, the air jet heads on the same side being connected, and the two printing assemblies respectively driving the plurality of air jet heads connected thereto to move so that each air jet head covers the width of the object to be printed, thereby maintaining the vertical position of the object to be printed in the printing station.

5. The inkjet printer according to claim 4, characterized by The air jet device further comprises four adjusting springs and two air jet sliding tracks, the two air jet sliding tracks are respectively arranged above and below the printing station, each air jet head is slidable along the corresponding air jet sliding track through a sliding block, two adjacent air jet heads on the same side are connected through a telescopic connecting rod, the outer air jet heads of each group of connected multiple air jet heads are connected with the respective adjusting springs, the inner air jet heads of each group of connected multiple air jet heads are fixedly connected with one side of the corresponding printing assembly, the printing assembly drives the connected multiple air jet heads to move along the air jet sliding track, and the adjusting springs provide elastic force to make the multiple air jet heads on the same side be distributed at intervals.

6. The inkjet printer according to claim 5, characterized by The air outlet holes of the air jet head are in a porous structure.

7. The inkjet printer according to claim 6, characterized by Each group of air jet assemblies further comprises two different magnetic materials, the two different magnetic materials are respectively arranged on each pair of corresponding upper and lower air jet heads to ensure that the upper and lower air jet heads are oppositely arranged.

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