Nozzle Adjustment System for Digital Inkjet Printer

Abstract

The present invention discloses a nozzle adjustment system for a digital inkjet printer, which includes a plurality of mutually parallel nozzle plates. A plurality of nozzles are installed on each of the nozzle plates, wherein some of the nozzles are fixed on the nozzle plates, and a nozzle adjustment mechanism is provided on the nozzle plate near each of the remaining nozzles. A horizontal adjustment mechanism for adjusting the horizontal position of the nozzle plate is provided between the nozzle plate and the equipment frame, and a height adjustment mechanism is provided between the nozzle plate and the color bar frame. The present invention can adjust in multiple directions to ensure the printing quality of the nozzles.

Description

Technical Field

[0001] The present invention relates to a nozzle adjustment system for a digital inkjet printer. Background Art

[0002] A plurality of arranged nozzles are loaded on a nozzle plate assembly of an inkjet printer. The nozzle is the core component for completing inkjet printing. The relative positions of the nozzles on the nozzle plate must be ensured to be parallel and aligned to ensure that all the nozzle holes on each nozzle are finally arranged in an orderly manner and accurately positioned, thereby ensuring the printing quality. When printing, tiny ink droplets are ejected from each nozzle hole of each nozzle onto the tile surface to form a pattern. Once the position of the nozzle is skewed and inaccurate, the printing effect will be affected. How to adjust the nozzle to ensure the printing quality is an urgent problem to be solved at present. Summary of the Invention

[0003] To overcome the above drawbacks, the purpose of the present invention is to provide a nozzle adjustment system for a digital inkjet printer that can be adjusted in multiple directions to ensure the printing quality of the nozzles.

[0004] To achieve the above object, the technical solution adopted by the present invention is: a nozzle adjustment system for a digital inkjet printer, including a plurality of mutually parallel nozzle plates, each of the nozzle plates is equipped with a plurality of nozzles, wherein some of the nozzles are fixed on the nozzle plate, and a nozzle adjustment mechanism is provided on the nozzle plate near each of the remaining nozzles. A horizontal adjustment mechanism for adjusting the horizontal position of the nozzle plate is provided between the nozzle plate and the equipment frame, and a height adjustment mechanism is provided between the nozzle plate and the color bar frame.

[0005] The beneficial effect of the nozzle adjustment system of the digital inkjet printer of the present invention is that the nozzle adjustment mechanism is used to adjust the position of each nozzle on the nozzle plate to finely adjust the nozzle; the horizontal adjustment mechanism is used to adjust the position of the nozzle plate equipped with a plurality of nozzles in the horizontal direction, and then ensure the horizontal positions of the plurality of nozzles on each nozzle plate, so as to roughly adjust the nozzle in the horizontal position; the height adjustment mechanism is used to adjust the position of the nozzle plate equipped with a plurality of nozzles in the vertical direction, and then ensure the height positions of the plurality of nozzles on each nozzle plate, so as to roughly adjust the nozzle in the height position. Through the above settings of the nozzle adjustment mechanism, the horizontal adjustment mechanism, and the height adjustment mechanism, the nozzle can be accurately adjusted in multiple directions, and finally the printing quality of the nozzle is ensured.

[0006] Preferably, each of the nozzle adjustment mechanisms includes a nozzle adjustment device and a spring piece; there are three nozzle adjustment devices, which are respectively located at three corners of the nozzle. Each corner is provided with a right-angled groove, which can drive the nozzle to move back and forth and left and right on the nozzle plate; the spring pieces are located at the remaining corner of the nozzle and one corner adjacent to this corner. There are two spring pieces located at the remaining corner and are staggered. The free ends of the spring pieces are closely attached to the two adjacent sides of this corner, forcing the nozzle to closely adhere to the three nozzle adjustment devices. The three eccentric adjustment devices located at the three corners of the nozzle are used to adjust the left-right, front-back positions of each nozzle in the horizontal direction. The three spring pieces force the nozzle to always closely adhere to the three nozzle adjustment devices.

[0007] Preferably, the nozzle adjustment device includes a preloading bolt, an adjusting bolt, a first pressing bolt, a first pressing block, and an adjustment mounting bracket; the preloading bolt passes through the nozzle and penetrates into the nozzle plate and is threadedly connected to a preloading nut inside the nozzle plate. The preloading nut can rotate inside the nozzle plate and move along the thickness direction of the nozzle plate. A preloading spring is sleeved on the preloading bolt located inside the nozzle plate and is tightened by the preloading nut. The elastic force of the preloading spring forces the preloading bolt to press the nozzle tightly on the nozzle plate, and there is a gap between the preloading bolt and the nozzle; the adjusting bolt passes through the nozzle plate. The shaft of the adjusting bolt is closely fitted with the nozzle plate and can rotate relatively. An adjustment pressing spring is sleeved on the adjusting bolt passing through the nozzle plate. The adjustment pressing spring is limited by a spring sleeve threadedly connected to the tail of the adjusting bolt. The adjustment pressing spring presses the head of the adjusting bolt on the nozzle plate. The head of the adjusting bolt is an eccentric structure and is provided with an internal hexagonal hole. The head of the adjusting bolt abuts against the side surface of the right-angled groove of the nozzle; the adjustment mounting bracket is fixed on the nozzle plate. The first pressing bolt threadedly passes through the nozzle plate and is threadedly connected and fixed to the first pressing block. One end of the first pressing block is clamped on the adjustment mounting bracket, and the other end presses the spring sleeve. Optimize and adjust the nozzle installation and adjustment structure, improve the adjustment accuracy, and finally make the spray holes of each nozzle arranged in an orderly manner and in accurate positions, so as to ensure the printing quality. The printing width of the printing device is increased, and the printing quality is stable.

[0008] Preferably, the adjusting bolts of some of the nozzle adjustment devices are non-eccentric structures, and the central axes of the heads and shafts of the adjusting bolts coincide. During adjustment, multiple nozzles are installed on one nozzle plate. When adjusting the nozzles, first determine a central nozzle, adjust the central nozzle first, and then fix it. Other nozzles are adjusted accordingly according to the position of the central nozzle. Then determine another central nozzle, and the remaining nozzles are adjusted according to the second central nozzle. The numerous nozzles on a longer nozzle plate can be adjusted. The problem that the existing nozzle plate cannot meet the requirements due to the increasing number of nozzles installed and the long length of the nozzle plate can be solved.

[0009] Preferably, the preload nut is provided with a slot or a cross slot that cooperates with a screwdriver. When adjusting, first use a screwdriver to keep the preload nut still, rotate the preload bolt, and under the action of the preload spring, reach the set torque.

[0010] Preferably, the horizontal adjustment mechanism includes a deflection alignment adjustment device and a position limiting rotation device. The rear end of the nozzle plate rotates with the device frame through the position limiting rotation device and can move relatively. The front end of the nozzle plate is connected to the device frame through the deflection alignment adjustment device, and can control the front end of the nozzle plate to move in the front and back and left and right directions. The method of rotating one end and adjusting the other end is adopted to adjust the front and back, left and right positions of the entire nozzle plate in the horizontal direction. The structure is simple, the adjustment is labor-saving, the time consumption is short, and the adjustment efficiency is improved.

[0011] Preferably, the limited rotation device includes a rotation positioning pin and a rear guide limit block, the rear guide limit block is fixed on the equipment frame, the rear guide limit block is U-shaped, the rotation positioning pin is clamped in the rear guide limit block, the two can rotate and move relative to each other, and the rotation positioning pin is connected to the rear end of the nozzle plate; the deflection alignment adjustment device includes an adjustment block, a fixed block, a limit bolt, and an adjustment top screw, the adjustment block is fixedly installed below the front end of the nozzle plate, the adjustment block is a frame-shaped structure, the fixed block is fixed on the equipment frame and is located in the adjustment block, a gap is left between the fixed block and the adjustment block, two limit bolts are provided and are threadedly connected to the adjacent sides of the adjustment block, two adjustment top screws are provided and are threadedly connected to the remaining adjacent sides of the adjustment block, and the two adjustment top screws and the two limit bolts are respectively pressed against the fixed block. The rear end of the nozzle plate rotates around the central axis of the rotating positioning pin, and the rotating positioning pin can move forward and backward in the U-shaped rear guide limit block; the front end of the nozzle plate is adjusted by two adjusting screws and two limit bolts to adjust the front and rear, left and right positions of the adjustment block in the fixed block, and then adjust the front and rear, left and right positions of the nozzle plate. When adjusting the front end, the rear end of the nozzle plate moves forward and backward and rotates in the rear guide limit block. Then, the nozzle plates of multiple color strips are ensured to be parallel to each other, and the front and rear alignment positions of the nozzle plates are ensured, which improves the printing accuracy.

[0012] Preferably, the height adjustment mechanism includes height adjustment devices installed between the nozzle plate and the color strip frame and located at both ends, and height auxiliary adjustment devices located in the middle, and the height auxiliary adjustment devices are arranged at intervals in the middle of the nozzle plate and the color strip frame. The entire nozzle plate can maintain a good flatness, ensuring that the heights of the nozzles on the nozzle plate are consistent, and in particular, eliminating the phenomenon of concave in the middle.

[0013] Preferably, the height adjustment device includes a first adjustment bolt, a first nut, and a spring. The first adjustment bolt passes through the nozzle plate from bottom to top and is threadedly connected to the bottom plate of the color bar frame. The first adjustment bolt fastens the nozzle plate and the color bar frame through the first nut at its free end. The spring is arranged between the nozzle plate and the bottom plate and sleeved on the first adjustment bolt. The height auxiliary adjustment device includes a gasket, a second nut, and a second adjustment bolt. The second adjustment bolt passes through the square tube cross beam of the color bar frame and is threadedly locked and fixed to the nozzle plate. Two gaskets and two second nuts are provided and sleeved on the second adjustment bolt. The two gaskets are locked on the upper and lower end faces of the square tube cross beam through the second nuts.

[0014] Preferably, to solve the problem that the prior art cannot ensure the temperature balance of each nozzle, heating tapes are arranged on both sides of the nozzle plate in the present invention. The heating tapes are arranged inside the reinforcing ribs on both sides of the nozzle plate. A temperature sensor is arranged on the nozzle plate and is connected to a controller. It is used to heat the nozzle plate, and finally the heat is conducted through the nozzle plate to increase the temperature of the nozzles installed on the nozzle plate. The temperature sensor is responsible for detecting the temperature of the nozzles and keeping the temperature constant through the corresponding controller. The beneficial effect of the solution and the technical problem solved: Ensure the temperature balance of each nozzle.

[0015] Preferably, to solve the problem that the existing nozzle plate assembly has a poor sealing effect and it is easy for air pollutants such as dust to deposit on the printing nozzles, ultimately affecting the printing effect, a nozzle protection plate is arranged below the nozzle in the present invention. A mylar film is arranged between the nozzle and the nozzle protection plate, and square holes corresponding to the nozzles are arranged on the mylar film. It seals between the nozzles at the bottom of the nozzle plate and the nozzle plate to ensure the internal cleanliness of the core part of printing. Description of the Drawings

[0016] Figure 1 It is an exploded view of the nozzle adjustment mechanism and the nozzle plate in this embodiment;

[0017] Figure 2 It is a perspective view of the nozzle adjustment mechanism in this embodiment;

[0018] Figure 3 It is a bottom view of the nozzle adjustment mechanism and the nozzle plate in this embodiment;

[0019] Figure 4 is Figure 3 the cross-sectional view at A - A in

[0020] Figure 5 It is a cross-sectional view of the nozzle adjustment mechanism in this embodiment;

[0021] Figure 6A perspective view of the horizontal adjustment mechanism cooperating with the nozzle plate in this embodiment;

[0022] Figure 7 is Figure 6 a partial enlarged view of part B in

[0023] Figure 8 An exploded view of the deflection alignment adjustment device in this embodiment;

[0024] Figure 9 A cross-sectional view of the deflection alignment adjustment device in this embodiment;

[0025] Figure 10 A perspective view of the limit rotation device in this embodiment;

[0026] Figure 11 A perspective view of the height adjustment mechanism cooperating with the color bar frame in this embodiment;

[0027] Figure 12 An exploded view of the height adjustment mechanism cooperating with the color bar frame in this embodiment;

[0028] Figure 13 A cross-sectional view of the height adjustment device in this embodiment;

[0029] Figure 14 A cross-sectional view of the height auxiliary adjustment device in this embodiment. Detailed implementation manners

[0030] The following elaborates on the preferred embodiments of the present invention in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making the protection scope of the present invention more clearly defined.

[0031] Refer to the attached Figure 1-14 As shown, a nozzle adjustment system of a digital inkjet printer in this embodiment includes multiple mutually parallel nozzle plates 100. A plurality of nozzles 200 are installed on each nozzle plate 100. Among them, some nozzles 200 are fixed on the nozzle plate 100, and a nozzle adjustment mechanism 800 for finely adjusting each nozzle 200 is provided on the nozzle plate 100 near each of the remaining nozzles 200. A horizontal adjustment mechanism 300 for adjusting the horizontal position of the nozzle plate 100 is provided between the nozzle plate 100 and the equipment frame to coarsely adjust the horizontal position of the nozzles 200, and a height adjustment mechanism 400 is provided between the nozzle plate 100 and the color bar frame 500 to coarsely adjust the height position of the nozzles 200.

[0032] As Figure 1-5As shown in the figure, each nozzle adjustment mechanism 800 in this embodiment includes a nozzle adjustment device 810 and a spring piece 820; there are three nozzle adjustment devices 810, which are respectively located at three corners of the nozzle 200, and each corner is provided with a right-angled groove 210, which can drive the nozzle 200 to move back and forth and left and right on the nozzle plate 100; the spring pieces 820 are located at the remaining one corner of the nozzle 200 and one corner adjacent to this corner, and there are two spring pieces 820 located at the remaining one corner and are arranged staggeredly. The free ends of the spring pieces 820 are closely attached to the two adjacent sides of this corner, forcing the nozzle 200 to closely abut against the three nozzle adjustment devices 810.

[0033] The nozzle adjustment device 810 includes a preloading bolt 811, an adjusting bolt 812, a first pressing bolt 813, a first pressing block 814 and an adjustment mounting bracket 815; the preloading bolt 811 passes through the nozzle 200 and penetrates into the nozzle plate 100 and is threadedly connected to a preloading nut 816 inside the nozzle plate 100. The preloading nut 816 can rotate inside the nozzle plate 100 and move along the thickness direction of the nozzle plate 100. A preloading spring 817 is sleeved on the preloading bolt 811 inside the nozzle plate 100 and is abutted by the preloading nut 816. The elastic force of the preloading spring 817 forces the preloading bolt 811 to press the nozzle 200 against the nozzle plate 100, and there is a gap between the preloading bolt 811 and the nozzle 200; the adjusting bolt 812 passes through the nozzle plate 100. The shaft of the adjusting bolt 812 is closely matched with the nozzle plate 100 and can rotate relatively. An adjustment pressing spring 818 is sleeved on the adjusting bolt 812 passing through the nozzle plate 100. The adjustment pressing spring 818 is limited by a spring sleeve 819 threadedly connected to the tail of the adjusting bolt 812. The adjustment pressing spring 818 presses the head of the adjusting bolt 812 against the nozzle plate 100. The head of the adjusting bolt 812 is an eccentric structure and is provided with an internal hexagonal hole. The head of the adjusting bolt 812 abuts against the side surface of the right-angled groove 210 of the nozzle 200; the adjustment mounting bracket 815 is fixed on the nozzle plate 100. The first pressing bolt 813 threadedly passes through the nozzle plate 100 and is threadedly connected and fixed to the first pressing block 814. One end of the first pressing block 814 is clamped on the adjustment mounting bracket 815, and the other end presses the spring sleeve 819. The preloading nut 816 is provided with a slotted or cross-shaped groove for cooperating with a screwdriver.

[0034] Using the adjusting bolt 812 with an eccentric internal hexagonal head as the adjusting screw, by adjusting the angle of the adjusting bolt 812, the front-back, left-right position and deflection angle of the nozzle 200 can be accurately controlled. Two of the adjusting bolts 812 are closely attached to the side surface of the right-angled groove 210 along the long direction of the nozzle 200, and the remaining one adjusting bolt 812 is closely attached to the side surface of the right-angled groove 210 along the short direction of the nozzle 200.

[0035] The adjusting bolt 812 of the nozzle adjusting device 810 described in the part is a non-eccentric structure, and the central axis of the head and the shaft of the adjusting bolt 812 coincides. The nozzle fixed by the non-eccentric structure adjusting bolt 812 is the central nozzle. Taking the 21-nozzle as an example, the 9th nozzle is selected as the first central nozzle S9, and the 17th nozzle is selected as the second central nozzle S17. The 1st to 8th nozzles (8 in total) are on the left of the first central nozzle, and the 10th to 17th nozzles (8 in total) are on the right of the first central nozzle. During adjustment, first fix the position of the first central nozzle, and use it as the positioning reference to adjust the positions of the 1st to 8th nozzles and the 10th to 17th nozzles. After the adjustment is completed, then use the second central nozzle as the reference to adjust the positions of the 18th to 21st nozzles.

[0036] When adjusting the nozzle 200 with the nozzle adjusting device 810 adopting an eccentric structure, the nozzle 200 is pressed on the nozzle plate 100 under the action of the preloading bolt 811, the preloading nut 816 and the preloading compression spring 817. Since there is a gap between the preloading bolt 811 and the nozzle mounting hole of the nozzle 200, the position of the nozzle 200 on the nozzle 100 can be slightly adjusted. Since there is a slotted head on the preloading nut 816, the preloading nut 816 can be fixed by a screwdriver, and the preloading bolt 811 can be rotated to adjust the elastic force of the preloading compression spring 817 being compressed.

[0037] The eccentric adjusting bolt 812 and the spring sleeve 819 are tightened with each other (the head of the spring sleeve 819 is hexagonal), and are pressed on the nozzle plate 100 by adjusting the compression spring 818. The shaft part of the eccentric adjusting bolt 812 is in precise fit with the nozzle plate 100 and can rotate. The head of the eccentric adjusting bolt 812 contacts the nozzle 200. During adjustment, use a wrench to rotate the eccentric adjusting bolt 812. Since the shaft part and the head of the eccentric adjusting bolt 812 are eccentric by 0.1 mm, by rotating the adjusting bolts 812 at the three corners, the position of the nozzle 200 changes in the left-right, front-back directions, and the spring piece 820 at the remaining corner presses the nozzle 200 tightly.

[0038] After the adjustment is completed, it is necessary to tighten the first compression bolt 813 (before adjustment, the first compression bolt 813 is in a relatively loose state to ensure that the eccentric adjusting bolt 812 can rotate). In this way, the first compression block 814 will press the spring sleeve 819 tightly, fixing the position of the eccentric adjusting bolt 812, and thus fixing the position of the nozzle 200. The first compression block 814 is stuck in the adjustment mounting bracket 815 to ensure that the position of the first compression block 814 does not deflect. Subsequently, by rotating and adjusting the three eccentric adjusting bolts 812, the front-back, left-right and deflection of the nozzle 200 can be adjusted. Finally, the spray holes of each nozzle 200 are arranged in an orderly manner and the positions are accurately aligned.

[0039] Such as Figure 6-10As shown in the figure, the horizontal adjustment mechanism 300 includes a deflection alignment adjustment device 310 and a limit rotation device 320. The rear end of the nozzle plate 100 is rotatably connected to the equipment frame through the limit rotation device 320 and can move relatively. The front end of the nozzle plate 100 is connected to the equipment frame through the deflection alignment adjustment device 310, and the front end of the nozzle plate 100 can be controlled to move in the front-back and left-right directions.

[0040] The limit rotation device 320 includes a rotation positioning pin 321 and a rear guide limit block 322. The rear guide limit block 322 is fixed on the equipment frame. The rear guide limit block 322 is U-shaped. The rotation positioning pin 321 is clamped in the rear guide limit block 322, and the two can rotate relative to each other and move relative to each other. The rotation positioning pin 321 is connected to the rear end of the nozzle plate 100. The deflection alignment adjustment device 310 includes an adjustment block 311, a fixed block 312, a limit bolt 313, and an adjustment setscrew 314. The adjustment block 311 is fixedly installed below the front end of the nozzle plate 100. The adjustment block 311 has a frame-like structure. The fixed block 312 is fixed on the equipment frame and is located within the adjustment block 311. There is a gap between the fixed block 312 and the adjustment block 311. Two limit bolts 313 are provided and are threadedly connected to two adjacent sides of the adjustment block 311. Two adjustment setscrews 314 are provided and are threadedly connected to the remaining two adjacent sides of the adjustment block 311. The two adjustment setscrews 314 and the two limit bolts 313 respectively abut against the fixed block 312.

[0041] Wherein, a second spring 315 is provided between the limit bolt 313 and the fixed block 312. The limit bolt always abuts against the fixed block, which is convenient for the adjustment of the adjustment setscrew. Two setscrew nuts 316 are fixed on two adjacent sides of the adjustment block 311. The two adjustment setscrews 314 are respectively in threaded cooperation with the two setscrew nuts 316. The setscrew nuts 316 are stepped, and the force is reasonable.

[0042] A second pressing block 317 is provided above the nozzle plate 100. A second pressing bolt 3111 is provided on the second pressing block 317. The second pressing bolt 3111 passes through the nozzle plate 100 and is threadedly connected to the top of the fixed block 312. There is a gap between the second pressing bolt 3111 and the nozzle plate 100. After the adjustment of the nozzle plate 100 is completed, the nozzle mounting plate is fixed with the second pressing bolt 3111 and the second pressing block 317.

[0043] The side cross-section of the fixed block 312 is T-shaped. The adjustment block 311 has a through hole 318 for the fixed block 312 to pass through. The side cross-section of the through hole 318 is T-shaped. The T-shaped structure plays a role of limiting and guiding, and the sliding of the adjustment block on the fixed block is restricted and can only slide in the horizontal direction.

[0044] A front guiding and limiting block 319 is arranged below the adjusting block 311. The front guiding and limiting block 319 is fixed on the equipment frame, and the fixing block 312 passing through the adjusting block 311 is fixed on the front guiding and limiting block 319 by bolts.

[0045] The opening of the rear guiding and limiting block 322 is in a flared shape. The rotary positioning pin 321 has a structure with a larger diameter in the middle than at both ends, and the rotary positioning pin 321 is arc-shaped from top to bottom. When the nozzle plate is pushed into the equipment frame, it will not get stuck.

[0046] A concave point mark 3110 is arranged at the head of the adjusting setscrew 314. It can be used as a reference point during adjustment, which is convenient for the operator to record the number of turns of adjustment.

[0047] When adjusting the horizontal position of the nozzle plate 200, rotate the two adjusting setscrews 314. Under the combined action of the adjusting setscrew 314, the setscrew nut 316 and the second spring 315, the setscrew nut 316 is installed in the adjusting block 311. Under the action of the second spring 315, and subjected to the outward acting force of the adjusting setscrew 314, the setscrew nut 316 is in a stepped shape with reasonable force, and the adjusting block 311 can move back and forth, left and right. Since the adjusting block 311 is installed on the nozzle plate 200, and the nozzle plate 200 is also affected by the limiting and rotating device 320 at the rear end, it can only deflect along the axis of the rotary positioning pin 321 and move back and forth along the inner groove of the rear guiding and limiting block 322. Since this horizontal adjustment mechanism is provided for each color bar assembly and each equipment frame, the nozzle plates 200 on all color bar assemblies can be adjusted to keep the nozzle plates 200 parallel to each other and aligned front and back, meeting the printing requirements. After the adjustment is completed, use the second pressing bolt 3111 and the second pressing block 317 to fix the nozzle plate 200. The second pressing bolt 3111 is fastened on the middle adjusting block 311.

[0048] As Figure 11-14 shown, the height adjustment mechanism 400 includes height adjustment devices 410 installed at both ends between the nozzle plate 100 and the color bar frame 500, and a height auxiliary adjustment device 420 located in the middle. The height auxiliary adjustment devices 420 are arranged at intervals in the middle of the nozzle plate 100 and the color bar frame 500.

[0049] The height adjustment device 410 includes a first adjustment bolt 411, a first nut 412, and a first spring 413. The first adjustment bolt 411 penetrates the nozzle plate 100 from bottom to top and is threadedly connected to the bottom plate 510 of the color bar frame 500. The first adjustment bolt 411 fastens the nozzle plate 100 and the color bar frame 500 through the first nut 412 at its free end. The first spring 413 is arranged between the nozzle plate 100 and the bottom plate 510 and sleeved on the first adjustment bolt 411. The height auxiliary adjustment device 420 includes a gasket 421, a second nut 422, and a second adjustment bolt 423. The second adjustment bolt 423 passes through the square tube cross beam 530 of the color bar frame 500 and is threadedly locked and fixed to the nozzle plate 100. Two gaskets 421 and two second nuts 422 are provided and sleeved on the second adjustment bolt 423. The two gaskets 421 are locked to the upper and lower end faces of the square tube cross beam 530 through the second nuts 422.

[0050] Reinforcing ribs 110 are provided on the nozzle plate 100. The second adjustment bolt 423 is threadedly connected to the reinforcing ribs 110 of the nozzle plate 100, ensuring the connection strength of the second adjustment bolt 423.

[0051] The height auxiliary adjustment devices 420 are located on both sides of the nozzle plate 100. At least two height auxiliary adjustment devices 420 are provided on each side and are evenly spaced. The height auxiliary adjustment devices located on both sides of the nozzle mounting plate can better ensure the flatness of the nozzle mounting plate.

[0052] A rivet nut 520 is integrally formed on the upper end face of the bottom plate 510. The first adjustment bolt 411 passes through the rivet nut 520 in a threaded manner and is locked and fixed through the first nut 412. This enables the bottom plate of the color bar frame to better achieve threaded cooperation with the first adjustment bolt.

[0053] When adjusting the height adjustment device 410, rotate the first adjustment bolt 411 to change the heights of the four corners of the nozzle plate 100, ensuring that the heights of the four corners of the nozzle plate 100 are the same and reaching the predetermined height value. Then lock the first nut 412 at the topmost part of the first adjustment bolt 411 to ensure that the height remains fixed.

[0054] When adjusting the height auxiliary adjustment device 420, at the beginning of the adjustment, the lower gasket 421 and second nut 422 are not in contact with the square tube and maintain a certain distance, while the upper gasket 421 and second nut 422 are in contact with the square tube. By rotating the upper second nut 422, the height of the nozzle plate 100 is driven to change upward. After adjustment, ensure that the middle of the nozzle plate 100 does not sag. After completion, lock the lower second nut 422.

[0055] Heating tapes 120 are provided on both sides of the nozzle plate 100. The heating tapes 120 are arranged inside the reinforcing ribs 110 on both sides of the nozzle plate 100 and are used to heat the nozzle plate 100. Finally, through the conduction of the nozzle plate 100, the temperature of the nozzles 200 installed on the nozzle plate 100 is increased. A temperature sensor 130 is provided on the nozzle plate 100, and the temperature sensor 130 is connected to a controller. The temperature sensor 130 is responsible for detecting the temperature of the nozzles 200 and maintaining a constant temperature through the corresponding controller.

[0056] A nozzle protection plate 600 is provided below the nozzles 200. A mylar film 700 is provided between the nozzles 200 and the nozzle protection plate 600. Square holes corresponding to the nozzles 200 are provided on the mylar film 700. The thickness of the mylar film 700 is 0.2 mm. Square holes are provided on the mylar film 700 according to the arrangement of each nozzle 200, and the size of the single side of the square hole is 0.1 mm smaller than the outer size of the nozzle 200, so that the nozzles 200 can pass through.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A nozzle adjustment system for a digital inkjet printer, comprising a plurality of mutually parallel nozzle plates (100), with a plurality of nozzles (200) mounted on each of the nozzle plates (100), wherein some of the nozzles (200) are fixed on the nozzle plates (100), characterized in that: A nozzle adjustment mechanism (800) is provided on the nozzle plate (100) near each of the remaining nozzles (200). A horizontal adjustment mechanism (300) for adjusting the horizontal position of the nozzle plate (100) is provided between the nozzle plate (100) and the equipment frame, and a height adjustment mechanism (400) is provided between the nozzle plate (100) and the color bar frame (500). Each of the nozzle adjustment mechanisms (800) includes a nozzle adjustment device (810) and a spring piece (820). There are three nozzle adjustment devices (810), which are respectively located at three corners of the nozzle (200). Each corner is provided with a right-angled groove (210), which can drive the nozzle (200) to move back and forth and left and right on the nozzle plate (100). The nozzle adjustment device (810) includes a preloading bolt (811), an adjusting bolt (812), a first pressing bolt (813), a first pressing block (814), and an adjustment mounting bracket (815). The preloading bolt (811) passes through the nozzle (200) and penetrates into the nozzle plate (100) and is threadedly connected to a preloading nut (816) inside the nozzle plate (100). The preloading nut (816) can rotate inside the nozzle plate (100) and move along the thickness direction of the nozzle plate (100). A preloading spring (817) is sleeved on the preloading bolt (811) inside the nozzle plate (100) and is pressed against by the preloading nut (816). The elastic force of the preloading spring (817) forces the preloading bolt (811) to press the nozzle (200) against the nozzle plate (100), and there is a gap between the preloading bolt (811) and the nozzle (200). The adjusting bolt (812) passes through the nozzle plate (100). The shaft of the adjusting bolt (812) is in close fit with the nozzle plate (100) and can rotate relatively. An adjustment pressing spring (818) is sleeved on the adjusting bolt (812) passing through the nozzle plate (100). The adjustment pressing spring (818) is limited by a spring sleeve (819) threadedly connected to the tail of the adjusting bolt (812). The adjustment pressing spring (818) presses the head of the adjusting bolt (812) against the nozzle plate (100). The head of the adjusting bolt (812) is an eccentric structure and is provided with an internal hexagonal hole. The head of the adjusting bolt (812) abuts against the side surface of the right-angled groove (210) of the nozzle (200). The adjustment mounting bracket (815) is fixed on the nozzle plate (100). The first pressing bolt (813) threadedly passes through the nozzle plate (100) and is threadedly connected and fixed to the first pressing block (814). One end of the first pressing block (814) is clamped on the adjustment mounting bracket (815), and the other end presses the spring sleeve (819). It also includes a central nozzle, which is a nozzle fixed by an adjusting bolt with a non-eccentric structure. The center axis of the head and the shaft of the adjusting bolt with a non-eccentric structure coincide. When adjusting the nozzles, first determine a central nozzle. The nozzle fixed by the non-eccentric structure adjusting bolt is the central nozzle. First adjust the central nozzle and then fix it in place. The other nozzles are adjusted accordingly based on the position of the central nozzle. Then determine another central nozzle, and the remaining nozzles are adjusted according to the second central nozzle.

2. The nozzle adjustment system of the digital inkjet printer according to claim 1, wherein: The spring pieces (820) are located at one of the remaining corners of the nozzle (200) and one of the corners adjacent to this corner. There are two spring pieces (820) located at one of the remaining corners and are arranged staggeredly. The free ends of the spring pieces (820) are in close contact with the two adjacent sides of this corner, forcing the nozzle (200) to closely abut against three nozzle adjusting devices (810).

3. The nozzle adjustment system of the digital inkjet printer according to claim 1, characterized in that: The horizontal adjustment mechanism (300) includes a deflection alignment adjustment device (310) and a limit rotation device (320). The rear end of the nozzle plate (100) is rotatably connected to the equipment frame through the limit rotation device (320) and can move relatively. The front end of the nozzle plate (100) is connected to the equipment frame through the deflection alignment adjustment device (310), and can control the front end of the nozzle plate (100) to move in the front-back and left-right directions.

4. The nozzle adjustment system of the digital inkjet printer according to claim 3, characterized in that: The limit rotation device (320) includes a rotation positioning pin (321) and a rear guiding limit block (322). The rear guiding limit block (322) is fixed on the equipment frame. The rear guiding limit block (322) is U-shaped. The rotation positioning pin (321) is clamped in the rear guiding limit block (322), and the two can rotate relative to each other and move relatively. The rotation positioning pin (321) is connected to the rear end of the nozzle plate (100); The deflection alignment adjustment device (310) includes an adjustment block (311), a fixed block (312), a limit bolt (313), and an adjustment set screw (314). The adjustment block (311) is fixedly installed below the front end of the nozzle plate (100). The adjustment block (311) has a frame-like structure. The fixed block (312) is fixed on the equipment frame and is located inside the adjustment block (311). There is a gap between the fixed block (312) and the adjustment block (311). There are two limit bolts (313) which are threadedly connected to the two adjacent sides of the adjustment block (311). There are two adjustment set screws (314) which are threadedly connected to the remaining two adjacent sides of the adjustment block (311). The two adjustment set screws (314) and the two limit bolts (313) respectively abut against the fixed block (312).

5. The nozzle adjustment system of the digital inkjet printer according to claim 3, characterized in that: The height adjustment mechanism (400) includes height adjustment devices (410) installed at both ends between the nozzle plate (100) and the color bar frame (500), and a height auxiliary adjustment device (420) located in the middle. The height auxiliary adjustment device (420) is arranged at intervals in the middle of the nozzle plate (100) and the color bar frame (500).

6. The nozzle adjustment system of the digital inkjet printer according to claim 5, characterized in that: The height adjustment device (410) includes a first adjustment bolt (411), a first nut (412), and a first spring (413). The first adjustment bolt (411) penetrates the nozzle plate (100) from bottom to top and is threadedly connected to the bottom plate (510) of the color bar frame (500). The first adjustment bolt (411) fastens the nozzle plate (100) and the color bar frame (500) through the first nut (412) at its free end. The first spring (413) is arranged between the nozzle plate (100) and the bottom plate (510) and sleeved on the first adjustment bolt (411). The height auxiliary adjustment device (420) includes a gasket (421), a second nut (422), and a second adjustment bolt (423). The second adjustment bolt (423) passes through the square tube cross beam (530) of the color bar frame (500) and is threadedly locked and fixed to the nozzle plate (100). There are two gaskets (421) and two second nuts (422), both of which are sleeved on the second adjustment bolt (423). The two gaskets (421) are locked to the upper and lower end faces of the square tube cross beam (530) through the second nuts (422).

7. The nozzle adjustment system of the digital inkjet printer according to claim 1, characterized in that: Heating tapes (120) are arranged on both sides of the nozzle plate (100). The heating tapes (120) are arranged inside the reinforcing ribs (110) on both sides of the nozzle plate (100). A temperature sensor (130) is arranged on the nozzle plate (100), and the temperature sensor (130) is connected to the controller.

8. The nozzle adjustment system of the digital inkjet printer according to claim 1, wherein: A nozzle protection plate (600) is arranged below the nozzle (200). A mylar film (700) is arranged between the nozzle (200) and the nozzle protection plate (600). Square holes corresponding to the nozzles (200) are arranged on the mylar film (700).

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