A front staggered double-sided printing machine

Abstract

The application relates to a front-end staggered double-sided inkjet printer, which comprises a rack, the rack is provided with a material feeding mechanism, a material collecting mechanism, a conveying roller mechanism, two inkjet heads and a corresponding abutting mechanism corresponding to the inkjet heads, the two inkjet heads respectively face two surfaces of the material, the abutting mechanism is arranged opposite to the inkjet heads, and the abutting mechanism is used for abutting and supporting the part of the material deviating from the inkjet heads. The application can improve the inkjet stability.

Description

Technical Field

[0001] This application relates to the field of inkjet printing equipment, and more particularly to a double-sided inkjet printer with staggered front ends. Background Technology

[0002] Chinese Patent Application No. 2021106291087 discloses an asynchronous double-sided inkjet printer with staggered vertical parallel dual ink carriages, including a frame. A fabric feeding mechanism is provided at the top right side of the frame, and a fabric take-up mechanism is provided at the bottom right side of the frame. A fabric release tension mechanism is provided at the top of the inner cavity of the frame, and a fabric take-up tension mechanism is provided at the bottom of the inner cavity of the frame. A guide mechanism is provided in the middle of the top of the inner cavity of the frame. A first print head is provided on the top right side of the inner cavity of the frame, and a second print head is provided on the top left side of the inner cavity of the frame. The inkjet nozzles of the first and second print heads are arranged in a staggered manner. By setting the staggered print heads, alternating color contamination is reduced.

[0003] The material (such as cloth or plastic film) is conveyed mainly by the cooperation of a tension mechanism and a guiding mechanism. The tension mechanism forces the material to stretch and have tension, while the guiding mechanism is used to correct the conveying direction of the material so that the locomotive can be aligned with the material.

[0004] The greater the tension applied to the material by the tensioning mechanism, the stronger the material's positional stability and the less likely the material is to shift under the force of the inkjet printer. However, when the material is highly stretchable, the greater the tension applied to the material by the tensioning mechanism, the more easily the material is stretched and deformed, thus affecting the printing effect. Summary of the Invention

[0005] To improve printing stability, this application provides a double-sided inkjet printer with staggered printing heads.

[0006] This application provides a double-sided inkjet printer with staggered printing heads, which adopts the following technical solution:

[0007] A double-sided inkjet printer with staggered printing heads includes a frame, a feeding mechanism, a receiving mechanism, a conveying roller mechanism, two printing heads, and abutment mechanisms that correspond one-to-one with the printing heads. The two printing heads face the two surfaces of the material respectively, and the abutment mechanisms are arranged opposite to the printing heads. The abutment mechanisms are used to abut and support the parts of the material that are away from the printing heads.

[0008] By adopting the above technical solution and setting up a backing mechanism to support the part of the material away from the printing head, the material's ability to resist the ink jet force of the printing head is improved, the material is less prone to displacement, and the material has strong stability. At the same time, the tension applied to the material by the conveyor roller mechanism is reduced in a disguised way, so as to reduce the tensile deformation of the material and thus ensure the printing effect.

[0009] Optionally, the abutting mechanism includes a servo motor, a rotating roller, and a first wedge strip. The rotating roller is rotatably connected to the frame. The outer contour of the rotating roller's cross-section is a regular icosagon. A support portion is provided on the outer plane of the rotating roller for surface contact with the material. An installation groove is provided at the edge of the outer periphery of the rotating roller, and the first wedge strip is detachably connected to the installation groove. The exposed side of the first wedge strip is flush with the support portion. The servo motor is used to drive the rotating roller to rotate. The exposed side of the first wedge strip leaves a crease on the surface of the material. The creases left by the two abutting mechanisms on the material are located on the two sides of the material and are aligned. The two abutting mechanisms are arranged vertically and are located on the two sides of the material. The printing head has multiple adjacent inkjet heads, and the spray direction of each inkjet head is... The printing plane is defined by the support portion perpendicular to multiple support portions, where the material is adhered and which faces the inkjet head. The angle between the two edges of the printing plane and the line connecting them to the axis of the rotating roller is 18°. The printing planes are combined to form a printing area, and the sum of the angles corresponding to the printing areas is 72°. The support portion where the material first contacts the rotating roller is defined as the entry support portion, and the support portion where the material last contacts the rotating roller is defined as the exit support portion. The entry support portion and the exit support portion are located on two adjacent sides of the printing area. When the rotating roller stops rotating and the printing head is printing, the entry support portion of the upper rotating roller is horizontal, and the exit support portion of the upper rotating roller is vertical. The entry support portion of the lower rotating roller is vertical, and the exit support portion of the lower rotating roller is horizontal.

[0010] By adopting the above technical solution, firstly, by setting a rotating roller with a positive 20-degree deformation, a certain angle is formed between each printing plane, which allows the material to fit more closely to the printing plane, or the material can be supported by the edges on both sides of the printing plane. The positional stability of the material is extremely high. Furthermore, the distance between the two edges of the printing plane is relatively short, which can reduce the offset of the material's middle position, thereby greatly improving the positional stability of the material and thus improving the printing effect.

[0011] By setting entry and exit support sections, the mating position and angle between the material and the printing plane are defined, allowing the material to better adhere to the printing plane, or the material to be supported by the edges on both sides of the printing plane, thereby improving the positional stability of the material.

[0012] Secondly, by driving the rotating rollers with a servo motor, the rotating rollers can cooperate with the conveying roller mechanism to assist in the material conveying, thereby reducing the tensile deformation caused by long-distance material conveying.

[0013] Furthermore, by controlling the material conveying distance using rotating rollers, it is ensured that the creases applied to the material by the two rotating rollers are aligned, thereby reducing the stress and material deformation caused by the creases and thus ensuring printing quality.

[0014] Optionally, a second wedge strip is detachably provided in the mounting groove. The exposed side of the second wedge strip is higher than the support portion. The exposed side of the second wedge strip leaves a crease on the surface of the material, and two adjacent second wedge strips and the support portion form an isolation cavity.

[0015] By adopting the above technical solution, when the material has a certain porosity, ink can easily pass through the material and adhere to the roller. Therefore, the original first wedge can be replaced by a second wedge. The second wedge is higher than the first wedge, so that the material is supported by the exposed side of the second wedge. There is a gap between the material and the roller, thereby reducing the waste ink contamination caused by the material directly adhering to the roller. At the same time, the support of the second wedge ensures the positional stability of the material. Furthermore, the distance between two adjacent second wedges is small, resulting in a better support effect.

[0016] Optionally, the frame is provided with multiple first air inlets and multiple first air outlets. The second wedge-shaped strip is provided with a first air inlet channel and a first air outlet channel. The isolation chamber is provided with a first vent pipe. The first vent pipe is located between two adjacent second wedge-shaped strips and is parallel to the support portion. A first isolation gap is formed between the first vent pipe and the material. Each first vent pipe is arranged at equal intervals along the axis of the rotating roller. The two ends of the first vent pipe are respectively connected to the first air inlet channel and the first air outlet channel of two adjacent second wedge-shaped strips. The inner wall of the first vent pipe is provided with a contraction section and a throat section in sequence along the airflow direction. The throat section is provided with a negative pressure port that penetrates to the outer peripheral wall of the first vent pipe and connects to the first isolation gap. When the second wedge-shaped strip moves to the printing area with the rotating roller, the first air inlet channel of the second wedge-shaped strip is connected to the first air inlet pipe, and the first air outlet channel of the second wedge-shaped strip is connected to the first air outlet pipe.

[0017] By adopting the above technical solution, when the second wedge strip moves to the printing area with the rotating roller, the first air inlet of the second wedge strip is connected to the first air inlet pipe, and the first air outlet of the second wedge strip is connected to the first air outlet pipe. The first air inlet pipe injects air through the first air inlet of one of the second wedge strips. The air enters the first ventilation pipe, then enters the first air outlet of the other second wedge strip, and is discharged from the first air outlet pipe.

[0018] When air flows in the first vent, the flow velocity increases and the pressure decreases due to the smaller diameter of the constriction section, thereby creating a negative pressure at the negative pressure port to attract air from the first isolation gap into the first vent. Therefore, when inkjet ink passes through the material, it is easily drawn into the first vent by the airflow, thus reducing inkjet ink accumulation in the support section.

[0019] Optionally, the frame is provided with multiple second air inlets and multiple second air outlets. The second air inlets are used to transport cold air. The second wedge-shaped strips are provided with second air inlets and second air outlets. The isolation chamber is provided with a second vent pipe. The second vent pipe is located between two adjacent second wedge-shaped strips and is parallel to the support portion. The second vent pipe forms a second isolation gap with the material. The second isolation gap is smaller than the first isolation gap. Each second vent pipe is arranged at equal intervals along the axis of the rotating roller and is located between two adjacent first vent pipes. The two ends of the second vent pipe are respectively connected to the second air inlets and second air outlets of two adjacent second wedge-shaped strips. The inner wall of the second vent pipe is provided with a strip-shaped cold air port that connects to the second isolation gap. The length direction of the strip-shaped cold air port is the length direction of the second vent pipe, and the outlet direction of the cold air port is inclined towards the first vent pipes on both sides.

[0020] By adopting the above technical solution, when the second wedge strip moves to the printing area with the rotating roller, the second air inlet of the second wedge strip is connected to the second air inlet pipe, and the second air outlet of the second wedge strip is connected to the second air outlet pipe. The second air inlet pipe injects cold air through the second air inlet of one of the second wedge strips. The cold air enters the second ventilation pipe, then enters the second air outlet of the other second wedge strip, and is discharged from the second air outlet pipe.

[0021] The cold air flows at a slower speed in the second vent pipe, and some of the cold air is discharged into the second isolation gap through the cold air port. This cold air will lower the temperature inside the isolation chamber, thereby cooling the material in time and reducing the material's thermal deformation. Furthermore, the cold air discharged from the cold air port will continue to move towards the negative pressure port under the negative pressure attraction. That is, the continuously flowing cold air forms a barrier. When the inkjet passing through the material encounters this barrier, the cold air flow will carry away the inkjet, thereby reducing the accumulation of inkjet on the support.

[0022] Optionally, the rotating roller has a tubular structure, and a sliding cavity is formed on the outer circumferential surface of the rotating roller. A microporous plate is fixed at the opening of the sliding cavity, and the microporous plate serves as the support. A piston is slidably connected to the sliding cavity along the radial direction of the rotating roller. A round rod parallel to the axis of the rotating roller is fixed at one end of the piston. A guide ring located inside the rotating roller is fixed to the frame. The guide ring is coaxially arranged with the rotating roller, and a guide groove is formed inside the guide ring. The round rod and the guide groove are slidably connected along the rotation direction of the rotating roller. The guide groove sequentially includes a normal pressure section, a gradually negative pressure section, a negative pressure section, and a gradually normal pressure section along the rotation direction of the rotating roller, wherein the gradually negative pressure section is directly opposite the entry point. The support section has a negative pressure section facing the printing area and a gradually normal pressure section facing away from the support section. When the round rod moves in the gradually negative pressure section, it gradually approaches the axis of the rotating roller under the guidance of the inner wall of the guide groove, and the piston gradually moves towards the axis of the rotating roller, gradually generating negative pressure in the sliding cavity. When the round rod moves in the negative pressure section, the sliding cavity maintains a negative pressure state. When the round rod moves in the gradually normal pressure section, it gradually moves away from the axis of the rotating roller under the guidance of the inner wall of the guide groove, and the piston gradually moves away from the axis of the rotating roller, gradually restoring normal pressure in the sliding cavity.

[0023] By adopting the above technical solution, when the rotating roller rotates to drive the material conveying process, the rotating roller drives the piston and the round rod to rotate together. The round rod slides in the guide groove. When the round rod moves to the gradually negative pressure section, the round rod gradually approaches the axis of the rotating roller under the guidance of the inner wall of the guide groove. The piston gradually moves towards the axis of the rotating roller, and negative pressure is gradually generated in the sliding cavity, thereby adsorbing the material entering the support part onto the support part. When the rotating roller continues to rotate, the round rod enters the negative pressure section. The distance between the round rod and the axis of the rotating roller remains unchanged, and the sliding cavity maintains a negative pressure state, so that the material entering the support part moves to the printing plane station with the rotation of the rotating roller, and ensures that the material on the printing plane station remains in a state of being adsorbed and fixed, thereby improving the printing stability.

[0024] As the round rod moves within the gradually normal pressure section, it is guided by the inner wall of the guide groove to gradually move away from the axis of the rotating roller. The piston gradually moves away from the axis of the rotating roller, and the sliding cavity gradually returns to normal pressure, thereby reducing suction and releasing the material so that the material can be separated from the rotating roller at the point where it leaves the support, so as to facilitate the subsequent conveying of the material.

[0025] Optionally, the conveying roller mechanism is located in front of the abutting mechanism. The conveying roller mechanism includes a guide roller and two friction rollers. The friction rollers drive the material forward by friction. The guide roller is located on the side of the friction roller closer to the abutting mechanism. The guide roller is lower than the highest point of the rotating roller. The material bypasses the guide roller and extends obliquely upward to adhere to the entry support.

[0026] By adopting the above technical solution, and by setting the relative positions of the guide roller and the rotating roller, an angle is formed between the material and the entry support section. When the rotating roller moves the material to the station of the entry support section, the material will gradually adhere to the surface of the entry support section, thereby gradually expelling the air between the two. At the same time, the flatness of the adhesion is higher, thus ensuring the flatness of the material when it moves from the entry support section station to the printing plane, thereby improving the printing quality.

[0027] Optionally, the abutment mechanism includes a support plate, a negative pressure fan, and a support arm. The support plate and the support arm are both mounted on the frame. The support plate is located on the side of the support arm closer to the printing head. The negative pressure fan is located between the support plate and the support arm. The support plate has multiple through holes, and the support arm has multiple strip-shaped holes. A water circulation channel is provided inside the support plate. Abutment rods are detachably provided on both the upper and lower sides of the support plate. The outer peripheral surface of the abutment rods protrudes from the surface of the support plate facing the printing head.

[0028] By adopting the above technical solution, by setting a negative pressure fan and using the through holes, the material is adsorbed onto the support plate, thereby fixing the position of the material. Furthermore, by circulating water through the water circulation channel, circulating water can be introduced to cool the support plate and the material, thereby reducing the material's thermal deformation.

[0029] Furthermore, when the material has pores, an abutment rod can be installed to support the material and separate it from the surface of the support strip, thereby reducing the contamination of the material by waste ink from the support strip and ensuring printing quality.

[0030] Optionally, the printing directions of the two printing heads are not parallel.

[0031] Optionally, the feeding mechanism includes a feeding roller, a support base, a protective cover plate, and a drive motor. The support base is mounted on the frame, and a driven gear is fixed to the end of the feeding roller. The support base has an upward-facing inner cavity for inserting the end of the feeding roller. The drive motor is mounted on the support base, and the output shaft of the drive motor is provided with a driving gear for meshing with the driven gear. The protective cover plate is used to open and close the inner cavity opening of the support base.

[0032] By adopting the above technical solution, and by setting the cooperation of the driving gear and the driven gear, the torque of the drive motor is transmitted to the feeding roller, thereby realizing the rotation of the feeding roller to feed the material.

[0033] Furthermore, when it is necessary to change materials, the protective cover can be removed to expose the inner cavity of the support seat, and then the feeding roller can be taken out, which is convenient and quick.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. By setting up a backing mechanism to back and support the part of the material away from the printing head, the material's ability to resist the ink jet force of the printing head is improved, the material is not easy to shift, the material has strong stability, and at the same time, the tension applied to the material by the conveyor roller mechanism is reduced in a disguised way, so as to reduce the tensile deformation of the material and thus ensure the printing effect.

[0036] 2. By setting a rotating roller with a positive 20-degree deformation, a certain angle is formed between each printing plane, which allows the material to fit more closely to the printing plane, or the material can be supported by the edges on both sides of the printing plane. The positional stability of the material is extremely high. In addition, the distance between the two edges of the printing plane is short, which can reduce the offset of the material's middle position, thereby greatly improving the positional stability of the material and thus improving the printing effect.

[0037] 3. By setting up a first vent pipe and a second vent pipe to form a cold air barrier with a fixed path, not only can the material be cooled to reduce the material's thermal deformation, but the ink that has passed through the material can also be carried away, thereby reducing the accumulation of ink in the support part.

[0038] 4. By setting up a microperforated plate, piston, round rod, and guide ring, the rotating roller drives the round rod to rotate relative to the guide ring, thereby controlling the sliding of the piston and controlling the air pressure in the sliding chamber. This allows the material to stably adhere to the microperforated plate at the point of entry into the support section and maintain a stable adherence state within the printing area, thus greatly improving printing stability. Furthermore, the material can be accurately released at the point of exit from the support section, reducing the adsorption and pulling of the material in the exiting state. This achieves stable adhesion and stable release, thereby improving the material conveying effect of the rotating roller and enhancing the support and fixation effect of the rotating roller on the material. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0040] Figure 2 This is a schematic diagram of the material transport path in Example 1.

[0041] Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle.

[0042] Figure 4 This is a schematic diagram of the abutment mechanism in Embodiment 1.

[0043] Figure 5 This is a schematic diagram of the abutment mechanism in Embodiment 1.

[0044] Figure 6 This is a schematic diagram of the end of the abutment mechanism in Embodiment 1.

[0045] Figure 7 This is a schematic diagram of the material transport path in Example 2.

[0046] Figure 8 This is a schematic diagram of the material transport path in Example 3.

[0047] Figure 9 This is a schematic diagram of the abutment mechanism in Embodiment 3.

[0048] Figure 10 This is a schematic diagram of the abutment mechanism in Embodiment 4.

[0049] Figure 11 This is a schematic diagram of the abutment mechanism in Embodiment 5.

[0050] Figure 12 yes Figure 11 A magnified view of a section at point B in the middle.

[0051] Figure 13 This is a top view of the support portion of Embodiment 5.

[0052] Figure 14 yes Figure 13 A sectional view of CC.

[0053] Figure 15 This is a schematic diagram of the abutment mechanism in Embodiment 6.

[0054] Figure 16 yes Figure 15 A magnified view of a section at point D.

[0055] Explanation of reference numerals in the attached drawings: 1. Material; 2. Rotary roller; 10. Frame; 101. First air inlet pipe; 102. First air outlet pipe; 103. Second air inlet pipe; 104. Second air outlet pipe; 11. Support strip; 12. Support arm; 13. Negative pressure fan; 14. Connector; 15. Strip-shaped hole; 16. Abutment rod; 17. Mounting strip; 20. Feeding mechanism; 201. Feeding roller; 202. Support seat; 203. U-shaped seat; 204. Driven gear; 205. Protective cover plate; 21. Support section; 211. Entering the support section; 212. Leaving the support section; 213. Printing plane; 22. First wedge strip; 23. Second wedge strip; 230. Isolation chamber; 231. First air inlet; 232. 233. First air outlet; 234. Second air inlet; 235. Second air outlet; 24. Cleaning roller; 25. First vent pipe; 250. First isolation gap; 251. Contraction section; 252. Throat section; 253. Negative pressure port; 26. Second vent pipe; 260. Second isolation gap; 261. Cold air port; 27. Guide ring; 28. Guide groove; 281. Normal pressure section; 282. Gradual negative pressure section; 283. Negative pressure section; 284. Gradual normal pressure section; 29. ​​Micro-perforated plate; 291. Connecting rod; 292. Round rod; 293. Sliding cavity; 294. Piston; 30. Material receiving mechanism; 40. Printing head; 50. Abutment mechanism; 60. Conveying roller mechanism; 601. Friction roller; 602. Guide roller. Detailed Implementation

[0056] The following is in conjunction with the appendix Figure 1-16 This application will be described in further detail.

[0057] Embodiment 1 of this application discloses a double-sided inkjet printer with staggered front ends.

[0058] Reference Figure 1 , Figure 2 The staggered double-sided inkjet printer includes a frame 10, which is equipped with a feeding mechanism 20, a receiving mechanism 30, a conveyor roller mechanism 60, two printing heads 40, and abutment mechanisms 50 corresponding to each printing head 40. The feeding mechanism 20 is used to convey material 1 to the conveyor roller mechanism 60, which in turn uses friction to continuously convey material 1 to the printing head 40. The two printing heads 40 are staggered vertically, with each head facing one of the two surfaces of material 1 to complete double-sided printing. The abutment mechanisms 50 are positioned opposite the printing heads 40 and are used to abut and support the parts of material 1 that are away from the printing heads 40, thereby improving the material 1's ability to resist the ink jetting force and indirectly reducing the tension applied to material 1 by the conveyor roller mechanism 60, thus reducing the stretching deformation of material 1 and ensuring the printing effect.

[0059] After printing, material 1 is wound up by the receiving mechanism 30.

[0060] The feeding mechanism 20 and the receiving mechanism 30 have similar structures, such as... Figure 3 As shown, the feeding mechanism 20 includes a feeding roller 201, a support seat 202, a protective cover plate 205, and a drive motor. The support seat 202 is mounted on the frame 10. There are two support seats 202 to support the two ends of the feeding roller 201 respectively. A driven gear 204 is fixed to one end of the feeding roller 201. The support seat 202 has an upward-opening inner cavity for the end of the feeding roller 201 to be inserted. The support seat 202 is also provided with a U-shaped seat 203 so that the feeding roller 201 can be inserted downward into the U-shaped seat 203 and realize the rotational connection of the feeding roller 201.

[0061] The drive motor is installed in the inner cavity of the support 202 (not shown in the figure). The output shaft of the drive motor is equipped with a drive gear (not shown in the figure). The drive gear is used to mesh with the driven gear 204. That is, the driven gear 204 is located above the drive gear. When the feeding roller 201 is vertically placed into the U-shaped seat 203, the driven gear 204 on it enters the inner cavity of the support 202 and meshes with the drive gear to transmit the torque of the drive motor to the feeding roller 201, thereby realizing the rotation of the feeding roller 201 to feed material.

[0062] The protective cover 205 and the U-shaped seat 203 are hinged together along the horizontal circumference. By rotating the protective cover 205, the inner cavity opening of the support seat 202 can be opened and closed, thereby reducing the possibility of operators accidentally reaching into the support seat 202. In other embodiments, a position sensor can be provided on the U-shaped seat 203. When the protective cover 205 is in the position of closing the inner cavity opening of the support seat 202, the position sensor is triggered to unlock the drive motor. At this time, the drive motor can be controlled by the switch to start and close.

[0063] When it is necessary to replace material 1, the protective cover 205 can be removed to expose the inner cavity of the support seat 202, and then the feeding roller 201 can be taken out, which is convenient and quick.

[0064] like Figure 4 , Figure 5 As shown, the abutment mechanism 50 includes a support plate 11, a negative pressure fan 13, and a support arm 12. The support plate 11 and the support arm 12 are both mounted on the frame 10. The support plate 11 and the support arm 12 are parallel to the feeding roller 201. The support plate 11 and the support arm 12 are arranged side by side, with the support plate 11 located on the side of the support arm 12 closer to the printing head 40.

[0065] like Figure 4 , Figure 5 and Figure 6As shown, the support plate 11 has multiple micro-through holes (not shown in the figure), the support arm 12 has multiple strip holes 15, and the negative pressure fan 13 is installed between the support plate 11 and the support arm 12. Therefore, when the material 1 is conveyed to the support plate 11, the negative pressure fan 13 is started, and the air on the surface of the support plate 11 is discharged through the through holes and strip holes 15 in sequence, thereby forming a negative pressure on the surface of the support plate 11 to adsorb the material 1 onto the surface of the support plate 11, so as to stabilize and fix the material 1 and improve the printing effect.

[0066] Furthermore, during the printing process, the ink generates a high amount of heat, which causes the material 1 to heat up. In order to reduce the heat deformation of the material 1, a water circulation channel (not shown in the figure) can be set in the support plate 11. The inlet and outlet of the water circulation channel are equipped with connectors 14, and circulating water can be introduced through an external water pipe to reduce the temperature of the support plate 11 by water cooling, thereby reducing the temperature of the material 1.

[0067] When material 1 has pores, the ink from the printing head 40 can easily pass through material 1. Therefore, a replacement film (not shown in the figure) can be adhered to the surface of the support strip 11. Meanwhile, abutment rods 16 are detachably provided on the upper and lower sides of the support strip 11. Figure 4 , Figure 5 As shown, mounting strips 17 are fixed to the upper and lower sides of the support strip 11 by bolts. Abutment rod 16 is provided on the mounting strip 17. The outer peripheral surface of the abutment rod 16 protrudes from the surface of the support strip 11 facing the printing head 40. That is, the material 1 is supported by the abutment rod 16. There is a gap between the material 1 and the support strip 11. The ink that passes through the material 1 remains on the replacement film. Because of the gap, the residual ink on the replacement film will not stain the back of the material 1. At the same time, after printing, the replacement film can be peeled off to ensure the cleanliness of the surface of the support strip 11.

[0068] Example 2

[0069] The difference between Example 2 and Example 1 is that the printing directions of the two printing heads 40 are not parallel. Specifically, the printing direction of the first printing head 40 is horizontal, and the printing direction of the second printing head 40 is inclined.

[0070] Example 3

[0071] The difference between Example 3 and Example 1 is that, as Figure 8 , Figure 9As shown, the abutting mechanism 50 includes a servo motor, a rotating roller 2 and a first wedge strip 22. The rotating roller 2 is parallel to the feeding roller 201 and is located on one side of the printing head 40. The two ends of the rotating roller 2 are rotatably connected to the frame 10. The servo motor is used to drive the rotating roller 2 to rotate (the servo motor is not shown in the figure). The rotating roller 2 is designed as a tubular structure. The rotating rollers 2 of the two abutting mechanisms 50 are staggered vertically, and the two rotating rollers 2 are located on both sides of the material 1.

[0072] like Figure 9 As shown, the outer contour of the cross-section of the roller 2 is a regular icosagon. The outer plane of the roller 2 is provided with a support portion 21, that is, the roller 2 has twenty support portions 21. In this embodiment, the support portion 21 is a solid structure of the outer circumferential plane of the roller 2. The support portion 21 is used for surface bonding of the material 1.

[0073] Furthermore, the outer peripheral edge of the roller 2 is provided with an installation groove, and a first wedge-shaped strip 22 is detachably connected in the installation groove. The first wedge-shaped strip 22 is arranged along the axial direction of the roller 2 and can be inserted into the installation groove axially. The exposed side of the first wedge-shaped strip 22 is a sharp side, and this exposed side is flush with the surface of the support part 21.

[0074] The printing head 40 has four adjacent inkjet heads (not shown in the figure). The jetting direction of each inkjet head is perpendicular to the corresponding support 21. The support 21 that is bonded to the material 1 and faces the inkjet head is designated as the printing plane 213. That is, as the roller 2 rotates, when any support 21 moves to a position where it is bonded to the material 1 and faces the inkjet head, the support 21 enters the printing station, and this support 21 becomes the printing plane 213. The angle between the two edges of the printing plane 213 and the line connecting them to the axis of the roller 2 is 18°. The printing planes 213 are combined to form a printing area, and the sum of the angles corresponding to the printing areas is 72°.

[0075] The support 21 where material 1 first contacts the rotating roller 2 is designated as the entry support 211, and the support 21 where material 1 last contacts the rotating roller 2 is designated as the exit support 212. The entry support 211 and the exit support 212 are located on two adjacent sides of the printing area, that is, the entry support 211 and the exit support 212 are workstations. That is, when any support 21 moves and first contacts the rotating roller 2 as the rotating roller 2 rotates, that support 21 is the workstation of the entry support 211, and the support 21 where material 1 last contacts the rotating roller 2 is the workstation of the exit support 212.

[0076] Furthermore, in order to ensure that when material 1 is fed into the rotary roller 2, material 1 can be pre-attached to the entry support 211, thereby making the material 1 on the entry support 211 move more stably to the printing plane 213 station, the conveying roller mechanism 60 is further limited.

[0077] like Figure 9 As shown, the conveying roller mechanism 60 is located in front of the abutment mechanism 50. The conveying roller mechanism 60 includes a guide roller 602, a motor, and two friction rollers 601. The motor is not shown in the figure. The friction rollers 601 are actively rotated by the motor. The friction rollers 601 drive the material 1 forward by friction. The guide roller 602 is located on the side of the friction rollers 601 closer to the abutment mechanism 50. The guide roller 602 is lower than the highest point of the rotating roller 2. The material 1 passes around the guide roller 602 and extends obliquely upward to adhere to the entry support part 211, so that there is an angle between the material 1 and the entry support part 211. When the rotating roller 2 drives the material 1 to the station of the entry support part 211, the material 1 will gradually adhere to the surface of the entry support part 211, thereby gradually expelling the air between the two. At the same time, the flatness of the adhesion is higher, thus ensuring the flatness of the material 1 when it moves from the station of the entry support part 211 to the printing plane 213, so as to improve the printing quality.

[0078] The implementation principle of Example 3 is as follows: As the rotating roller 2 rotates and the conveying roller mechanism 60 conveys, the material 1 will move from the entry support 211 to the printing plane 213 station. During this period, the exposed side of the first wedge strip 22 leaves a crease on the surface of the material 1. The material 1 adheres to the printing plane 213. When the rotating roller 2 stops rotating and the printing head 40 performs printing, the entry support 211 of the upper rotating roller 2 is in a horizontal state, the exit support 212 of the upper rotating roller 2 is in a vertical state, the entry support 211 of the lower rotating roller 2 is in a vertical state, and the exit support 212 of the lower rotating roller 2 is in a horizontal state.

[0079] Because there is a certain angle between each printing plane 213, the material 1 can fit more closely to the printing plane 213, and the positional stability of the material 1 is extremely high. In addition, the distance between the two edges of the printing plane 213 is relatively short, which can reduce the offset of the middle position of the material 1, thereby greatly improving the positional stability of the material 1 and thus improving the printing effect.

[0080] Secondly, the conveying distance of the material 1 by the rotating roller 2 can be controlled to ensure that the creases applied to the material 1 by the two rotating rollers 2 are aligned. That is, the creases left by the two abutting mechanisms 50 on the material 1 are located on the two sides of the material 1 and aligned, thereby reducing the stress and deformation of the material 1 caused by the creases, and thus ensuring the printing quality.

[0081] Example 4

[0082] The difference between Example 4 and Example 3 is that, as Figure 10As shown, a second wedge strip 23 is detachably provided in the mounting groove. When the material 1 has pores, ink can easily pass through the material 1 and adhere to the surface of the roller 2. Therefore, the first wedge strip 22 can be removed from the mounting groove and replaced with the second wedge strip 23. The exposed side of the two wedge strips is higher than the support part 21, and the two adjacent second wedge strips 23 and the support part 21 enclose and form an isolation cavity 230.

[0083] Material 1 is supported by the exposed side of the second wedge strip 23, which creates a gap between material 1 and the rotating roller 2, thereby reducing the waste ink contamination caused by material 1 directly contacting the rotating roller 2. At the same time, the support of the second wedge strip 23 ensures the positional stability of material 1. Furthermore, the distance between two adjacent second wedge strips 23 is small, resulting in a better support effect.

[0084] Furthermore, in order to reduce the repeated application of waste ink adhering to the exposed side of the second wedge strip 23 onto the material 1, a cleaning roller 24 can be installed on the frame 10. The cleaning roller 24 is parallel to the rotating roller 2 and is located on one side of the rotating roller 2. The brushed surface of the cleaning roller 24 abuts against the exposed side of the second wedge strip 23. Therefore, as the rotating roller 2 rotates, the second wedge strip 23 on it moves relative to the cleaning roller 24, and the cleaning roller 24 will wipe away the waste ink on the exposed side of the second wedge strip 23.

[0085] Example 5

[0086] The difference between Example 5 and Example 4 is that, as Figure 11 , Figure 12 , Figure 13 As shown, the frame 10 is provided with a plurality of first air inlet pipes 101, a plurality of first air outlet pipes 102, a plurality of second air inlet pipes 103 and a plurality of second air outlet pipes 104, wherein the first air inlet pipes 101 and the first air outlet pipes 102 are located on one side of the axial direction of the rotating roller 2, and the second air inlet pipes 103 and the second air outlet pipes 104 are located on the other side of the axial direction of the rotating roller 2. The second air inlet pipes 103 are used to transport cold air.

[0087] The second wedge-shaped strip 23 is provided with a second air inlet 233 and a second air outlet 234. The second air inlet 233 and the second air outlet 234 extend along the axial direction of the second wedge-shaped strip 23. The second air inlet 233 and the second air outlet 234 are arranged side by side. One end of the second air inlet 233 and the second air outlet 234 are connected, and the other end of the second air inlet 233 and the second air outlet 234 are closed. The connecting end of the second air inlet 233 and the second air outlet 234 is used to connect to the second air inlet pipe 103 and the second air outlet pipe 104 respectively.

[0088] The isolation chamber 230 is provided with a second vent pipe 26, which is located between two adjacent second wedge strips 23. The second vent pipe 26 is parallel to the support part 21 and forms a second isolation gap 260 between the second vent pipe 26 and the material 1. The second vent pipes 26 are arranged at equal intervals along the axis of the rotating roller 2. The two ends of the second vent pipe 26 are respectively connected to the second air inlet 233 and the second air inlet 233 of two adjacent second wedge strips 23. That is, one end of the second vent pipe 26 is connected to the second air inlet 233 of one of the adjacent second wedge strips 23, and the other end of the second vent pipe 26 is connected to the second air outlet 234 of the other adjacent second wedge strip 23.

[0089] like Figure 13 , Figure 14 As shown, the inner wall of the second vent pipe 26 is provided with a strip-shaped cold air port 261 that connects to the second isolation gap 260. The length direction of the strip-shaped cold air port 261 is the length direction of the second vent pipe 26. There are two strip-shaped cold air ports 261, and the air outlet directions of the two cold air ports 261 are inclined towards the axial sides of the rotating roller 2 respectively.

[0090] like Figure 12 , Figure 13 , Figure 14 As shown, a first vent pipe 25 is provided in the isolation chamber 230. The first vent pipe 25 is located between two adjacent second wedge strips 23. The first vent pipe 25 is parallel to the support part 21. Each first vent pipe 25 is arranged at equal intervals along the axis of the rotating roller 2 and is located between two adjacent second vent pipes 26. A first isolation gap 250 is formed between the first vent pipe 25 and the material 1. The first isolation gap 250 is larger than the second isolation gap 260. The two ends of the first vent pipe 25 are respectively connected to the first air inlet 231 of two adjacent second wedge strips 23. That is, one end of the first vent pipe 25 is connected to the first air inlet 231 of one of the adjacent second wedge strips 23, and the other end of the first vent pipe 25 is connected to the first air outlet 232 of the other adjacent second wedge strip 23.

[0091] The inner wall of the first ventilator 25 is provided with a constriction section 251 and a throat section 252 in sequence along the airflow direction. The throat section 252 is provided with a plurality of negative pressure ports 253 that penetrate to the outer peripheral wall of the first ventilator 25. The negative pressure ports 253 are connected to the first isolation gap 250.

[0092] When the second wedge strip 23 moves to the printing area with the rotating roller 2 and is ready to print, each second wedge strip 23 moves to the corresponding position of the first air inlet pipe 101, the second air inlet pipe 103, the first air outlet pipe 102, and the second air outlet pipe 104. At this time, the connecting end of the first air inlet channel 231 of one adjacent second wedge strip 23 is exactly connected to the first air inlet pipe 101, the connecting end of the first air outlet channel 232 of the other adjacent second wedge strip 23 is connected to the first air outlet pipe 102, the connecting end of the second air inlet channel 233 of one adjacent second wedge strip 23 is exactly connected to the second air inlet pipe 103, and the connecting end of the second air outlet channel 234 of the other adjacent second wedge strip 23 is connected to the second air outlet pipe 104.

[0093] The second intake pipe 103 injects cold air through the second intake passage 233 of one of the second wedges 23. The cold air enters the second vent pipe 26, then enters the second outlet passage 234 of the other second wedge 23, and is discharged from the second outlet pipe 104.

[0094] The cold air flows at a slower speed in the second vent pipe 26, and some of the cold air is discharged into the second isolation gap 260 through the cold air port 261. This cold air will reduce the temperature in the isolation cavity 230, thereby cooling the material 1 in time and reducing the thermal deformation of the material 1.

[0095] Simultaneously, the first air intake pipe 101 injects air through the first air intake channel 231 of one of the second wedge-shaped bars 23. The air enters the first vent pipe 25, then enters the first air outlet channel 232 of the other second wedge-shaped bar 23, and is discharged from the first air outlet pipe 102. During the flow of air in the first vent pipe 25, the flow velocity increases and the pressure decreases due to the smaller diameter of the constriction section 251, thereby forming a negative pressure at the negative pressure port 253. The cold air discharged from the cold air port 261 will continue to move towards the negative pressure port 253 under the negative pressure attraction of the negative pressure port 253. That is, the continuously flowing cold air forms a barrier. When the inkjet passing through the material 1 encounters this barrier, the cold airflow will carry away the inkjet, thereby reducing the inkjet accumulation in the support part 21.

[0096] Example 6

[0097] The difference between Example 6 and Example 3 is that, as Figure 15 , Figure 16As shown, a sliding cavity 293 is formed on the outer circumferential surface of the roller 2. The opening of the sliding cavity 293 can be elongated, with the length direction being the axial direction of the roller 2. In other embodiments, the opening of the sliding cavity 293 is circular, and multiple sliding cavities 293 can be provided, with each sliding cavity 293 arranged at intervals along the axial direction of the roller 2. In this embodiment, a microperforated plate 29 is fixed to the opening of the sliding cavity 293. The shape of the microperforated plate 29 matches the shape of the opening of the sliding cavity 293, that is, the microperforated plate 29 is the original support part 21. The microperforated plate 29 is used for the material 1 to be adhered, and the surface of the microperforated plate 29 is flush with the exposed side of the first wedge strip 22. A piston 294 is slidably connected to the sliding cavity 293 along the radial direction of the roller 2. One end of the piston 294 is fixed with a round rod 292 through a connecting rod 291. The round rod 292 is parallel to the axis of the roller 2.

[0098] The frame 10 is fixed with a guide ring 27 located inside the rotating roller 2. Specifically, the frame 10 is fixed with a bracket (not shown in the figure). The bracket enters the interior of the rotating roller 2 through one end opening of the rotating roller 2, so that the guide ring 27 is located inside the rotating roller 2. Furthermore, the guide ring 27 is coaxially arranged with the rotating roller 2.

[0099] The guide ring 27 has an annular guide groove 28. The round rod 292 is slidably connected to the guide groove 28 along the rotation direction of the roller 2. The guide groove 28 includes a normal pressure section 281, a gradually negative pressure section 282, a negative pressure section 283 and a gradually normal pressure section 284 along the rotation direction of the roller 2. The gradually negative pressure section 282 is an inclined straight line section and faces the entry support part 211. The negative pressure section 283 faces the printing area. The gradually normal pressure section 284 is an inclined straight line section and faces the exit support part 212.

[0100] As the roller 2 rotates to transport material 1, it drives the piston 294 and the round rod 292 to rotate together. The round rod 292 slides within the guide groove 28. When the round rod 292 moves to the gradually negative pressure section 282, it gradually approaches the axis of the roller 2 under the guidance of the inner wall of the guide groove 28. The piston 294 gradually moves towards the axis of the roller 2, and a negative pressure is gradually generated in the sliding cavity 293. That is, a negative pressure is generated in the area between the piston 294 and the microporous plate 29, thereby drawing the material into the support... Material 1 on part 211 is adsorbed onto the support part 211. After the roller 2 continues to rotate, the round rod 292 enters the negative pressure section 283. The distance between the round rod 292 and the axis of the roller 2 remains unchanged. The area between the piston 294 and the micro-perforated plate 29 remains under negative pressure so that the material 1 on the support part 211 can move stably to the printing plane 213 station as the roller 2 rotates, and ensure that the material 1 on the printing plane 213 station remains adsorbed and fixed to improve printing stability.

[0101] When the round rod 292 moves within the gradually normal pressure section 284, guided by the inner wall of the guide groove 28, the round rod 292 gradually moves away from the axis of the rotating roller 2. The piston 294 gradually moves away from the axis of the rotating roller 2, and the sliding cavity 293 gradually returns to normal pressure, thereby reducing the suction force to release the material 1. This makes it easier for the material 1 to quickly detach from the rotating roller 2 at the point where it leaves the support part 212, thereby reducing the adsorption and pulling on the material 1 in the detached state. That is, while the rotating roller 2 is conveying the material 1, it can also achieve stable adhesion and stable release, thereby improving the conveying effect of the rotating roller 2 on the material 1 and improving the support and fixing effect of the rotating roller 2 on the material 1.

[0102] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-sided inkjet printer with staggered front ends, characterized in that: The system includes a frame (10), which is equipped with a feeding mechanism (20), a receiving mechanism (30), a conveying roller mechanism (60), two printing heads (40), and abutment mechanisms (50) corresponding to each printing head (40). The two printing heads (40) are respectively positioned opposite the two surfaces of the material (1). The abutment mechanisms (50) are positioned opposite the printing heads (40) and are used to abut and support the parts of the material (1) that are away from the printing heads (40). The abutment mechanism (50) includes a servo motor, a rotating roller (2), and a first wedge (22). The rotating roller (2) is rotatably connected to the frame (10). The outer contour of the cross-section of the roller (2) is a regular icosagon. The outer plane of the roller (2) is provided with a support part (21). The support part (21) is used to fit the surface of the material (1). The outer peripheral edge of the roller (2) is provided with a mounting groove. The first wedge strip (22) is detachably connected in the mounting groove. The exposed side of the first wedge strip (22) is flush with the support part (21). The servo motor is used to drive the roller (2) to rotate. The exposed side of the first wedge strip (22) leaves a crease on the surface of the material (1). The creases left by the two abutment mechanisms (50) on the material (1) are located on the two sides of the material (1) and are aligned. The two abutting mechanisms (50) are arranged vertically, and the two abutting mechanisms (50) are located on both sides of the material (1); the printing head (40) has multiple adjacent inkjet heads, and the spraying direction of each inkjet head is perpendicular to multiple support parts (21). The support part (21) that the material (1) is attached to and is directly opposite the inkjet head is set as the printing plane (213). The angle between the two edges of the printing plane (213) and the line connecting the axis of the rotating roller (2) is 18°. The printing planes (213) are combined to form a printing area. The sum of the angles corresponding to the printing areas is 72°. The support part (21) where the material (1) first contacts the rotating roller (2) is set as the printing plane (213). To enter the support part (211), the support part (21) where the material (1) last contacts the roller (2) is set as the exit support part (212). The entry support part (211) and the exit support part (212) are located on two adjacent sides of the printing area. When the roller (2) stops rotating and the printing head (40) is printing, the entry support part (211) of the upper roller (2) is in a horizontal state, the exit support part (212) of the upper roller (2) is in a vertical state, the entry support part (211) of the lower roller (2) is in a vertical state, and the exit support part (212) of the lower roller (2) is in a horizontal state.The rotating roller (2) has a tubular structure. A sliding cavity (293) is provided on the outer circumferential surface of the rotating roller (2). A micro-perforated plate (29) is fixed at the opening of the sliding cavity (293). The micro-perforated plate (29) is the support part (21). A piston (294) is slidably connected to the sliding cavity (293) along the radial direction of the rotating roller (2). A round rod (292) parallel to the axis of the rotating roller (2) is fixed at one end of the piston (294). The frame (10) is fixed with a rod located on the rotating roller (293). 2) The guide ring (27) is coaxially arranged with the rotating roller (2). The guide ring (27) has a guide groove (28) inside. The round rod (292) and the guide groove (28) are slidably connected along the rotation direction of the rotating roller (2). The guide groove (28) includes a normal pressure section (281), a gradually negative pressure section (282), a negative pressure section (283), and a gradually normal pressure section (284) in sequence along the rotation direction of the rotating roller (2). Among them, the gradually negative pressure section (282) The negative pressure section (283) faces the printing area, and the gradual normal pressure section (284) faces the exit support section (212). When the round rod (292) moves in the gradual negative pressure section (282), the round rod (292) gradually approaches the axis of the rotating roller (2) under the guidance of the inner wall of the guide groove (28), and the piston (294) gradually moves towards the axis of the rotating roller (2). The sliding cavity (293) A negative pressure is gradually generated within the sliding cavity (293); when the round rod (292) moves in the negative pressure section (283), the sliding cavity (293) remains in a negative pressure state; when the round rod (292) moves in the gradually normal pressure section (284), the round rod (292) gradually moves away from the axis of the rotating roller (2) under the guidance of the inner wall of the guide groove (28), the piston (294) gradually moves away from the axis of the rotating roller (2), and the sliding cavity (293) gradually returns to normal pressure.

2. The double-sided inkjet printer with staggered front ends according to claim 1, characterized in that: The mounting groove is provided with a second wedge strip (23) which is detachably provided. The exposed side of the second wedge strip (23) is higher than the support part (21). The exposed side of the second wedge strip (23) leaves a crease on the surface of the material (1). The two adjacent second wedge strips (23) and the support part (21) together form an isolation cavity (230).

3. The double-sided inkjet printer with staggered front ends according to claim 2, characterized in that: The frame (10) is provided with a plurality of first air inlets (101) and a plurality of first air outlets (102). The second wedge strip (23) is provided with a first air inlet channel (231) and a first air outlet channel (232). The isolation chamber (230) is provided with a first vent pipe (25). The first vent pipe (25) is located between two adjacent second wedge strips (23). The first vent pipe (25) is parallel to the support part (21). The first vent pipe (25) forms a first isolation gap (250) with the material (1). Each first vent pipe (25) is arranged at equal intervals along the axial direction of the roller (2). The two ends of the first vent pipe (25) are respectively connected to two adjacent two... The first air inlet (231) of the second wedge (23) is connected to the first air inlet (231). The inner wall of the first vent pipe (25) is provided with a contraction section (251) and a throat section (252) in sequence along the airflow direction. The throat section (252) is provided with a negative pressure port (253) that penetrates to the outer peripheral wall of the first vent pipe (25) and is connected to the first isolation gap (250). When the second wedge (23) moves to the printing area with the rotating roller (2), the first air inlet (231) of the second wedge (23) is connected to the first air inlet pipe (101), and the first air outlet (232) of the second wedge (23) is connected to the first air outlet pipe (102).

4. The double-sided inkjet printer with staggered front ends according to claim 3, characterized in that: The frame (10) is provided with a plurality of second air inlets (103) and a plurality of second air outlets (104). The second air inlets (103) are used to transport cold air. The second wedge strip (23) is provided with a second air inlet channel (233) and a second air outlet channel (234). The isolation cavity (230) is provided with a second vent pipe (26). The second vent pipe (26) is located between two adjacent second wedge strips (23). The second vent pipe (26) is parallel to the support part (21). The second vent pipe (26) and the material (1) form a second isolation gap (260). The second isolation gap (260) is smaller than the first isolation gap. The gap (250) is filled in. Each second vent pipe (26) is arranged at equal intervals along the axial direction of the roller (2) and located between two adjacent first vent pipes (25). The two ends of the second vent pipe (26) are respectively connected to the second air inlet (233) and the second air inlet (233) of two adjacent second wedge strips (23). The inner wall of the second vent pipe (26) is provided with a strip-shaped cold air port (261) that connects to the second isolation gap (260). The length direction of the strip-shaped cold air port (261) is the length direction of the second vent pipe (26), and the air outlet direction of the cold air port (261) is inclined towards the first vent pipes (25) on both sides.

5. The double-sided inkjet printer with staggered front ends according to claim 4, characterized in that: The conveying roller mechanism (60) is located in front of the abutting mechanism (50). The conveying roller mechanism (60) includes a guide roller (602) and two friction rollers (601). The friction rollers (601) drive the material (1) forward by friction. The guide rollers (602) are located on the side of the friction rollers (601) closer to the abutting mechanism (50). The guide rollers (602) are lower than the highest point of the rotating roller (2). The material (1) passes around the guide rollers (602) and extends obliquely upward to adhere to the entry support (211).

6. The double-sided inkjet printer with staggered front ends according to claim 1, characterized in that: The printing directions of the two printing heads (40) are not parallel.

7. The double-sided inkjet printer with staggered front ends according to claim 1, characterized in that: The feeding mechanism (20) includes a feeding roller (201), a support seat (202), a protective cover plate (205), and a drive motor. The support seat (202) is mounted on the frame (10). A driven gear (204) is fixed at the end of the feeding roller (201). The support seat (202) has an upward-facing inner cavity for the end of the feeding roller (201) to be inserted. The drive motor is mounted on the support seat (202). The output shaft of the drive motor is provided with a driving gear for meshing with the driven gear (204). The protective cover plate (205) is used to open and close the inner cavity opening of the support seat (202).

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