A printing head for a printing machine

Abstract

This utility model discloses a printing head for a printing machine, including a printing head beam, a first end of which is hinged to the top of the printing head beam, and a second end of the inclined arm equipped with an inclined cylinder for connecting to the printing machine. Two guide rails are installed side-by-side along the length of the printing head beam. A drive wheel and a driven wheel are installed at opposite ends of the printing head beam. The drive wheel is connected to a reduction wheel installed on one side of the printing head beam, and the reduction wheel is connected to a printing head motor installed at the top of the printing head beam via a transmission belt. A synchronous belt is installed between the drive wheel and the driven wheel, and a doctor blade assembly is installed on the synchronous belt. An inner screen frame assembly and an outer screen frame assembly are installed at opposite ends of the doctor blade assembly. The inner screen frame assembly and the doctor blade assembly can be slidably mounted on the two guide rails. This utility model is relatively simple to operate, convenient to use, has better stability, and has multiple adjustment functions.

Description

Technical Field

[0001] This utility model relates to the field of printing machine technology, and specifically to a printing head for a printing machine. Background Technology

[0002] A printing machine is a widely used piece of equipment in industries such as textiles, clothing, home furnishings, and advertising. It is mainly used to print patterns, text, or logos on the surface of various materials. An oval printing machine is a type of printing machine whose core feature is its printing platform designed with elliptical (or circular) guide rails, distinguishing it from traditional flat or roller-type structures.

[0003] The print head is the component of a printing press that enables precise printing of patterns. It is the actuator of the printing press, transferring ink onto the substrate via inkjet or squeegee methods. Existing print heads are complex to operate, inconvenient to use, and have poor stability. Utility Model Content

[0004] In order to overcome at least one of the technical problems existing in the prior art, this utility model provides a printing head for a printing machine that is simple to operate, easy to use, more stable, and has multiple adjustment functions.

[0005] A printing head for a printing machine includes a printing head beam, a first end of which is hinged to the top of the printing head beam, and a second end of the inclined arm is equipped with an inclined cylinder, which can be used to connect to the printing machine.

[0006] Two guide rails are installed side by side along the length of the inside of the printing head beam. A drive wheel and a driven wheel are installed at the two ends of the printing head beam respectively. The drive wheel is connected to a reduction wheel installed on one side of the printing head beam. The reduction wheel is connected to the printing head motor installed on the top of the printing head beam through a transmission belt.

[0007] A timing belt is installed between the drive wheel and the driven wheel. A doctor blade assembly is installed on the timing belt. An inner screen frame assembly and an outer screen frame assembly are installed at both ends of the doctor blade assembly. The inner screen frame assembly and the doctor blade assembly can be slidably installed on two guide rails.

[0008] When the synchronous belt rotates, it drives the doctor blade assembly to slide along two guide rails. The inner and outer screen frame assemblies are used to install the screen. The inner screen frame assembly can slide along the two guide rails to adjust the spacing between the inner and outer screen frame assemblies.

[0009] In some embodiments, the doctor blade assembly includes a doctor blade mounting plate, a doctor blade slide plate is mounted on the top of the doctor blade mounting plate, a timing belt clamp is mounted on the doctor blade slide plate and is fixedly connected to a timing belt, a doctor blade cylinder is mounted on the top of the doctor blade mounting plate, the cylinder shaft of the doctor blade cylinder passes through the doctor blade mounting plate and is connected to a doctor blade rod, a doctor blade clamp is mounted on the doctor blade rod, a doctor blade plate is mounted on the doctor blade clamp, and a doctor blade is mounted on the doctor blade plate.

[0010] In some embodiments, the inner mesh frame assembly includes an inner mesh frame slide plate, an inner mesh frame lifting cylinder is installed at the bottom of the inner mesh frame slide plate, a top pressure cylinder is installed on the side wall of the inner mesh frame lifting cylinder, a top pressure plate is installed on the telescopic shaft of the top pressure cylinder, and top pressure blocks are installed at the top of both ends of the top pressure plate; an inner mesh frame adjusting assembly is installed at the lower end of the lifting shaft of the inner mesh frame lifting cylinder.

[0011] In some embodiments, the outer mesh frame assembly includes an outer mesh frame housing, an outer mesh frame lifting cylinder is installed at the lower end of the outer mesh frame housing, an outer mesh frame guide block is installed at the upper end of the lifting shaft of the outer mesh frame lifting cylinder, the outer mesh frame guide block is sleeved on two parallel guide rods, the two ends of the two guide rods extend from the two ends of the outer mesh frame housing, and an outer mesh frame translation motor and an outer mesh frame adjustment assembly are installed at the two ends of the two guide rods respectively, the outer mesh frame translation motor is threadedly connected to a first nut installed on the outer mesh frame guide block through a first screw.

[0012] In some embodiments, both the inner and outer mesh frame adjustment components include a fixed plate and a sliding plate slidably connected to the fixed plate. A fine-tuning motor and a reducer are mounted on one end of the fixed plate. The reducer is connected to one end of a second screw via a coupling. The other end of the second screw is connected to a second nut mounted on the sliding plate. An adjustable screen hanging rod seat is mounted on the sliding plate. A screen hanging rod is mounted on the screen hanging rod seat. Screen adjusting seats are mounted side by side on the sliding plates at both ends of the screen hanging rod seat. An adjusting block is connected to the lower end of the screen adjusting seat via a third screw. A screen magnet is mounted on the adjusting block.

[0013] In some embodiments, a set of concentric track wheels and a set of eccentric track wheels are installed on both the scraper slide and the inner frame slide.

[0014] In some embodiments, the first end of the diagonal arm is movably connected to a mounting base fixed to the top of the printhead beam via a pin, and a control panel, control screen, and indicator lights are mounted on the diagonal arm.

[0015] In some embodiments, sensors are installed on the doctor blade assembly, the inner screen frame assembly, and the outer screen frame assembly, and printhead sensor plates are installed on both sides of the printhead beam.

[0016] Compared with the prior art, the technical solution of this utility model has the following advantages:

[0017] 1. The first end of the printing head beam is connected to the upper end of the printing machine via a diagonal cylinder on the diagonal arm, and the second end of the printing head beam is connected to the lower end of the printing machine via a spring steel plate; the diagonal cylinder can counteract vibration or offset and maintain uniform pressure on the printing head; the spring steel plate reduces the impact of mechanical vibration on printing accuracy;

[0018] 2. The scraper cylinder is used to control the scraper to rise or fall; the inner mesh frame lifting cylinder is used to control the lifting of the two top pressure blocks. After the two top pressure blocks rise, they can hold the bottom of the two guide rails to prevent the inner mesh frame assembly from sliding.

[0019] 3. The inner mesh frame lifting cylinder is used to control the lifting of the inner mesh frame adjusting component. The inner mesh frame adjusting component is used to install the mesh and adjust the height and level of the mesh. The outer mesh frame translation motor can control the adjustment of the distance between the outer mesh frame adjusting component and the inner mesh frame adjusting component.

[0020] IV. The height of the screen hanging rod and the adjusting block from the ground can be adjusted. The adjusting block is equipped with a screen magnet to hold the screen in place and prevent it from jumping during printing. When the fine-tuning motor is working, it drives the reducer and the second screw to rotate. When the second screw rotates, it drives the sliding plate to slide along the fixed plate to adjust the position of the screen. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of this application when installed on a printing machine;

[0023] Figure 2 This is a frontal stereoscopic structural diagram of this application;

[0024] Figure 3 This is a rear-view stereoscopic structural diagram of this application;

[0025] Figure 4 This is a structural diagram after removing components such as the diagonal brace and the stamping beam;

[0026] Figure 5 This is a three-dimensional structural diagram of the doctor blade assembly;

[0027] Figure 6 This is a front-view 3D structural diagram of the inner frame component;

[0028] Figure 7 This is a rear-view 3D structural diagram of the inner frame component;

[0029] Figure 8 This is a front-view 3D structural diagram of the outer frame component;

[0030] Figure 9 yes Figure 8 A schematic diagram of the structure after removing the outer frame shell;

[0031] Figure 10 This is a rear-view 3D structural diagram of the outer frame component;

[0032] Figure 11 Yes, yes Figure 10 A schematic diagram of the structure after removing the outer mesh frame shell.

[0033] Figure label:

[0034] Imprint beam 1, spring steel plate 1a;

[0035] 2. Diagonal arm;

[0036] Pin 200, mounting base 201, control board 202, control panel 203, indicator light 204;

[0037] 3. Inclined cylinder; 4. Printing machine; 5. Guide rail; 6. Drive wheel; 7. Driven wheel; 8. Reducer wheel; 9. Print head motor; 10. Synchronous belt.

[0038] Squeegee assembly 11;

[0039] Scraper mounting plate 1100, scraper slide plate 1101, timing belt clamp 1102, scraper cylinder 1103, scraper rod 1104, scraper clamp 1105, scraper plate 1106, scraper 1107;

[0040] Inner frame component 12;

[0041] Inner mesh frame slide plate 1200, inner mesh frame lifting cylinder 1201, top pressure cylinder 1202, top pressure plate 1203, top pressure block 1204, inner mesh frame adjusting assembly 1205;

[0042] External frame component 13;

[0043] Outer mesh frame housing 1300, outer mesh frame lifting cylinder 1301, outer mesh frame guide block 1302, guide rod 1303, outer mesh frame translation motor 1304, outer mesh frame adjustment assembly 1305, first screw 1306, first nut 1307, elongated through hole 1308;

[0044] 14. Screen printing plate; 15. Sensor; 16. Print head sensor sheet.

[0045] Fixed plate 500, sliding plate 501, fine-tuning motor 502, reducer 503, coupling 504, second screw 505, second nut 506, screen hanging rod seat 507, screen hanging rod 508, screen adjusting seat 509, third screw 510, adjusting block 511, screen magnet 512;

[0046] Concentric track wheel 600, eccentric track wheel 601. Detailed Implementation

[0047] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0048] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0049] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] Reference Figures 1-11 A printing head for a printing machine includes a printing head beam 1 and a diagonal arm 2 with its first end hinged to the top of the printing head beam 1. A diagonal cylinder 3, preferably an adjustable damping cylinder, is installed at the second end of the diagonal arm 2. The diagonal cylinder 3 is used to connect to the printing machine 4. The other end of the printing head beam 1 can be connected to the printing machine 4 through a spring steel plate 1a.

[0052] Two cylindrical guide rails 5 are installed side by side along the length of the imprint beam 1. A drive wheel 6 and a driven wheel 7 are installed at both ends of the imprint beam 1. The drive wheel 6 is connected to a reduction wheel 8 installed on one side of the imprint beam 1. The reduction wheel 8 is connected to the imprint motor 9 installed on the top of the imprint beam 1 through a transmission belt. The imprint beam 1 can also be equipped with cable trays, air passages, synchronous belts, guide rail mounting positions, etc., to facilitate layout and installation.

[0053] A timing belt 10 is installed between the driving wheel 6 and the driven wheel 7. A doctor blade assembly 11 is installed on the timing belt 10. An inner screen frame assembly 12 and an outer screen frame assembly 13 are installed at both ends of the doctor blade assembly 11. The inner screen frame assembly 12 and the doctor blade assembly 11 can be slidably installed on two guide rails 5.

[0054] When the synchronous belt 10 rotates, it drives the doctor blade assembly 11 to slide along the two guide rails 5. The inner screen frame assembly 12 and the outer screen frame assembly 13 are used to install the screen 14. The inner screen frame assembly 12 can slide along the two guide rails 5 to adjust the distance between the inner screen frame assembly 12 and the outer screen frame assembly 13.

[0055] In use, the first end of the printing head beam 1 is connected to the upper end of the printing machine 4 via the inclined cylinder 3 on the inclined arm 2, and the second end of the printing head beam 1 is connected to the lower end of the printing machine 4 via the spring steel plate. The extension and retraction of the cylinder is converted into the vertical or inclined movement of the printing head beam 1 through the inclined arm 2, which can counteract the vibration or offset generated when the screen 14 contacts the substrate during the printing process, keeping the pressure of the printing head uniform. The rigidity of the inclined arm 2 can prevent the printing head from swinging due to inertia, while the buffering capacity of the cylinder absorbs mechanical impact. During the printing process, the printing head beam 1 will generate impact force due to frequent up and down movement. The elastic characteristics of the spring steel plate can absorb some vibration energy, reduce the impact of mechanical vibration on printing accuracy, disperse the pressure of the printing head beam 1 through elastic deformation, avoid local stress concentration, and protect the hinge points and cylinder connection parts.

[0056] The screen 14 is installed and fixed between the inner screen frame assembly 12 and the outer screen frame assembly 13. During printing rotation, when the printing table reaches the workstation, the computer instructs the inner and outer screen frame adjustment components to adjust their positions. Then, the doctor blade cylinder drives the doctor blade to descend to a suitable position with the screen 14. The printhead motor 9 drives the reduction wheel 8, the drive wheel 6, the driven wheel 7, and the synchronous belt 10 to rotate via the transmission belt. When the synchronous belt 10 rotates, it drives the doctor blade assembly 11 to move forward linearly along the two guide rails 5. The surface of the screen 14 is then... The photosensitive plate-making process creates a cutout pattern (the non-patterned areas are sealed by an adhesive layer). Ink is printed onto the substrate (such as fabric or paper) only through the cutout areas, achieving precise pattern reproduction. The printing squeegee moves under pressure on the surface of the screen 14, squeezing the ink through the cutout areas to achieve complete pattern transfer. Then, the printing squeegee and screen 14 are raised, the ink return squeegee is lowered, and the print head motor 9 drives the ink return squeegee to move in the opposite direction, scraping the residual ink on the screen 14 back to the starting position to ensure uniform ink distribution in the next printing.

[0057] In some embodiments, the doctor blade assembly 11 includes a doctor blade mounting plate 1100, a doctor blade slide plate 1101 mounted on the top of the doctor blade mounting plate 1100, a timing belt clip 1102 mounted on the doctor blade slide plate 1101, the timing belt clip 1102 being fixedly connected to the timing belt 10, two sets of doctor blade cylinders 1103 mounted on the top of the doctor blade mounting plate 1100, the cylinder shaft of each set of doctor blade cylinders 1103 passing through the doctor blade mounting plate 1100 and connected to a doctor blade rod 1104, a doctor blade clamp 1105 mounted on each doctor blade rod 1104, and a doctor blade 1106 mounted on each doctor blade clamp 1105. A squeegee 1107 is installed on 1106, and a squeegee cylinder 1103 is used to control the squeegee 1107 to rise or fall. As needed, both squeegees 1107 can be printing squeegees, or one can be a printing squeegee and the other can be a back-ink squeegee. The printing squeegee applies pressure and moves (usually forward) on the screen 14, squeezing the ink through the cutout pattern area of ​​the screen 14, so that the pattern is accurately transferred to the substrate (such as fabric or plastic). After the main squeegee finishes printing, the back-ink squeegee moves in the opposite direction (usually backward) to scrape the ink remaining on the screen 14 back to the starting position, ensuring that the ink is evenly distributed in the next printing.

[0058] In some embodiments, the inner mesh frame assembly 12 includes an inner mesh frame slide plate 1200, an inner mesh frame lifting cylinder 1201 installed at the bottom of the inner mesh frame slide plate 1200, a top pressure cylinder 1202 installed on the side wall of the inner mesh frame lifting cylinder 1201, a top pressure plate 1203 installed on the telescopic shaft of the top pressure cylinder 1202, and top pressure blocks 1204 installed side by side at the top of both ends of the top pressure plate 1203. The inner mesh frame lifting cylinder 1201 is used to control the lifting and lowering of the two top pressure blocks 1204. After the two top pressure blocks 1204 rise, they can press against the bottom of the two guide rails 5 to prevent the inner mesh frame assembly 12 from sliding. An inner mesh frame adjusting assembly 1205 is installed at the lower end of the lifting shaft of the inner mesh frame lifting cylinder 1201. The inner mesh frame lifting cylinder 1201 is used to control the lifting and lowering of the inner mesh frame adjusting assembly 1205. The inner mesh frame adjusting assembly 1205 is used to install the mesh plate 14 and adjust the height, level, etc. of the mesh plate 14.

[0059] In some embodiments, the outer mesh frame assembly 13 includes an outer mesh frame housing 1300. An outer mesh frame lifting cylinder 1301 is mounted on the lower end of the outer mesh frame housing 1300. An outer mesh frame guide block 1302 is mounted on the upper end of the lifting shaft of the outer mesh frame lifting cylinder 1301. The outer mesh frame guide block 1302 is sleeved on two parallel guide rods 1303. The two ends of the two guide rods 1303 extend from both ends of the outer mesh frame housing 1300. An outer mesh frame translation motor 1304 and an outer mesh frame adjustment assembly 1305 are correspondingly mounted on both ends of the two guide rods 1303. The outer mesh frame translation motor 1304 is threadedly connected to a first nut 1307 mounted on the outer mesh frame guide block 1302 via a first screw 1306. Three corresponding openings are provided on both sides of the outer mesh frame housing 1300. A long, narrow through-hole 1308 allows the first screw 1306 and two guide rods 1303 to move up and down. The outer mesh frame lifting cylinder 1301 drives the outer mesh frame guide block 1302, the outer mesh frame translation motor 1304, and the outer mesh frame adjusting assembly 1305 to move up and down synchronously, thereby adjusting the ground clearance of the outer mesh frame adjusting assembly 1305. When the outer mesh frame translation motor 1304 rotates, it drives the first screw 1306 to rotate. Because the outer mesh frame guide block 1302 is fixed, when the first screw 1306 rotates, the outer mesh frame translation motor 1304 and the outer mesh frame adjusting assembly 1305 will move forward or backward synchronously, realizing the adjustment of the distance between the outer mesh frame adjusting assembly 1305 and the inner mesh frame adjusting assembly 1205. An emergency stop switch and a pressure regulating valve are also provided on the outer mesh frame housing 1300.

[0060] In some embodiments, both the inner frame adjustment assembly 1205 and the outer frame adjustment assembly 1305 include a fixed plate 500 and a sliding plate 501 slidably connected to the fixed plate 500. The two are slidably connected by a dovetail groove structure. A fine-tuning motor 502 and a reducer 503 are installed at one end of the fixed plate 500. The reducer 503 is connected to one end of a second screw 505 via a coupling 504. The other end of the second screw 505 is connected to a second nut 506 installed on the sliding plate 501. An adjustable screen hanging rod seat 507, which is L-shaped, is installed on the sliding plate 501 by screws or bolts. A vertically arranged screen hanging rod 508 is threaded onto the screen hanging rod seat 507 for hanging the screen 14. The two ends of the screen hanging rod seat 507 are... A screen adjusting seat 509 is mounted side by side on the sliding plate 501. The lower end of the screen adjusting seat 509 is connected to an adjusting block 511 via a third screw 510. The height of the screen hanging rod 508 and the adjusting block 511 from the ground can be adjusted. A screen magnet 512 is installed on the adjusting block 511 to hold the screen 14 and prevent it from jumping during printing. When the fine-tuning motor 502 is working, it drives the reducer 503 and the second screw 505 to rotate. When the second screw 505 rotates, it drives the sliding plate 501 to slide along the fixed plate 500, thereby adjusting the position of the screen 14. The inner screen frame assembly 12 and the outer screen frame assembly 13 can realize the vertical and horizontal adjustment of the screen 14, and can be used to install screens 14 of different specifications, thus having better applicability.

[0061] In some embodiments, a set of concentric track wheels 600 and a set of eccentric track wheels are installed on both the doctor blade slide plate 1101 and the inner frame slide plate 1200. Both sets include at least two track wheels, and grooves are provided circumferentially on the outer walls of each concentric track wheel 600 and eccentric track wheel 601, which are adapted to the shape of the two guide rails 5. The concentric track wheel 600 serves as the main support wheel, ensuring that the sliding component moves linearly along the guide rail 5, bearing the main load and reducing friction. The eccentric track wheel 601 can be rotated to adjust its contact position with the guide rail 5, which is used to compensate for assembly tolerances, wear compensation, and preload control.

[0062] In some embodiments, the first end of the inclined arm 2 is movably connected to the mounting base 201 fixed on the top of the print head beam 1 via a pin 200, resulting in a stable structure. The inclined arm 2 is equipped with a control board 202, a control screen 203, and an indicator light 204 for easy intelligent control. The control board 202 is equipped with switches such as a scraper switch and a print head lifting switch. The control screen 203 can be a touch screen, which can be used to control fine-tuning of the printing plate. The indicator light 204 is used to indicate the working status and fault prompts.

[0063] In some embodiments, sensors 15 are installed on the doctor blade assembly 11, the inner screen frame assembly 12, and the outer screen frame assembly 13, and printing head sensing plates 16 are installed on both sides of the printing head beam 1 to facilitate automatic intelligent control. The sensors 15 can be used to detect the position signal of the printing head sensing plates 16 to ensure that each color plate is accurately aligned during multi-color printing. The sensors 15 monitor the movement speed of the printing head or screen 14 in real time and link with the control system to maintain uniform printing speed. The sensing plates trigger the limit sensors 15 to prevent the printing head from moving beyond its travel range. The sensing plates mark the printing start / end points to ensure that the actions of the doctor blade and the ink return blade are synchronized with the movement of the printing head.

[0064] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A printing head for a printing machine, comprising a printing head beam, a first end hinged to the top of the printing head beam, and a second end of the inclined arm equipped with an inclined cylinder for connection to a printing machine, characterized in that: Two guide rails are installed side by side along the length of the inside of the printing head beam. A drive wheel and a driven wheel are installed at the two ends of the printing head beam respectively. The drive wheel is connected to a reduction wheel installed on one side of the printing head beam. The reduction wheel is connected to the printing head motor installed on the top of the printing head beam through a transmission belt. A timing belt is installed between the drive wheel and the driven wheel. A doctor blade assembly is installed on the timing belt. An inner screen frame assembly and an outer screen frame assembly are installed at both ends of the doctor blade assembly. The inner screen frame assembly and the doctor blade assembly can be slidably installed on two guide rails. When the synchronous belt rotates, it drives the doctor blade assembly to slide along two guide rails. The inner and outer screen frame assemblies are used to install the screen. The inner screen frame assembly can slide along the two guide rails to adjust the spacing between the inner and outer screen frame assemblies.

2. The printing head of the printing machine as described in claim 1, characterized in that: The doctor blade assembly includes a doctor blade mounting plate, a doctor blade slide plate mounted on the top of the doctor blade mounting plate, a timing belt clamp mounted on the doctor blade slide plate, the timing belt clamp being fixedly connected to the timing belt, a doctor blade cylinder mounted on the top of the doctor blade mounting plate, the cylinder shaft of the doctor blade cylinder passing through the doctor blade mounting plate and connected to the doctor blade rod, a doctor blade clamp mounted on the doctor blade rod, a doctor blade plate mounted on the doctor blade clamp, and a doctor blade mounted on the doctor blade plate.

3. The printing head of the printing machine as described in claim 2, characterized in that: The inner mesh frame assembly includes an inner mesh frame slide plate, an inner mesh frame lifting cylinder is installed at the bottom of the inner mesh frame slide plate, a top pressure cylinder is installed on the side wall of the inner mesh frame lifting cylinder, a top pressure plate is installed on the telescopic shaft of the top pressure cylinder, and top pressure blocks are installed at the top of both ends of the top pressure plate; an inner mesh frame adjustment assembly is installed at the lower end of the lifting shaft of the inner mesh frame lifting cylinder.

4. The printing head of the printing machine as described in claim 3, characterized in that: The outer mesh frame assembly includes an outer mesh frame housing. An outer mesh frame lifting cylinder is installed at the lower end of the outer mesh frame housing. An outer mesh frame guide block is installed at the upper end of the lifting shaft of the outer mesh frame lifting cylinder. The outer mesh frame guide block is sleeved on two parallel guide rods. The two ends of the two guide rods extend from the two ends of the outer mesh frame housing. An outer mesh frame translation motor and an outer mesh frame adjustment assembly are installed at the two ends of the two guide rods respectively. The outer mesh frame translation motor is threadedly connected to the first nut installed on the outer mesh frame guide block through a first screw.

5. The printing head of the printing machine as described in claim 4, characterized in that: Both the inner and outer screen frame adjustment components include a fixed plate and a sliding plate slidably connected to the fixed plate. A fine-tuning motor and a reducer are installed at one end of the fixed plate. The reducer is connected to one end of a second screw via a coupling. The other end of the second screw is connected to a second nut installed on the sliding plate. An adjustable screen hanging rod seat is installed on the sliding plate. A screen hanging rod is installed on the screen hanging rod seat. Screen adjustment seats are installed side by side on the sliding plates at both ends of the screen hanging rod seat. An adjustment block is connected to the lower end of the screen adjustment seat via a third screw. A screen magnet is installed on the adjustment block.

6. The printing head of the printing machine as described in claim 5, characterized in that: Both the scraper slide and the inner mesh frame slide are equipped with a set of concentric track wheels and a set of eccentric track wheels.

7. The printing head of the printing machine as described in any one of claims 1 to 6, characterized in that: The first end of the diagonal arm is movably connected to the mounting base fixed on the top of the printing head beam via a pin. The diagonal arm is equipped with a control board, control panel and indicator lights.

8. The printing head of the printing machine as described in claim 7, characterized in that: Sensors are installed on the doctor blade assembly, inner screen frame assembly, and outer screen frame assembly, and print head sensor plates are installed on both sides of the print head beam.

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