A floating doctor mechanism for an automated screen printing machine

Abstract

The application belongs to the technical field of silk screen printing and specifically relates to a floating doctor blade mechanism of an automatic silk screen printing machine, which comprises a support and a mounting seat arranged on the support; a linear guide assembly and a synchronous transmission assembly are arranged on the mounting seat along the length direction of the mounting seat; a moving seat is slidably connected to the linear guide assembly; a double doctor blade assembly is arranged on the moving seat; second connecting shafts are symmetrically arranged on the two sides of the second doctor blade; a limiting ring is arranged on the top of the second connecting shaft; a second connecting block is movably arranged between the limiting ring and the moving seat; a preset gap is formed between the limiting ring and the second connecting block; and a second driving element is connected to the bottom of the second connecting block; when the second doctor blade contacts the surface of a printing substrate, the preset gap allows the second doctor blade to produce self-adapting displacement relative to the mounting seat to adhere to the surface of the printing substrate.

Description

Technical Field

[0001] This invention belongs to the field of screen printing technology, specifically relating to a floating squeegee mechanism for an automated screen printing machine. Background Technology

[0002] In the field of automated screen printing technology, the squeegee mechanism is one of the core components determining print quality. Existing automated screen printing machines generally employ a rigidly fixed squeegee structure. Its basic structure typically includes a mounting base, squeegee blades, and a transmission system (such as a motor with a synchronous belt or rack and pinion) that drives the squeegee's reciprocating motion. In these traditional designs, the squeegee is rigidly locked to the mounting base by bolts or clamps, ensuring absolute levelness and straightness during movement. To accommodate substrates of varying thicknesses, current technology typically controls the printing effect by adjusting the overall height of the squeegee or adjusting the pressure parameters between the squeegee and the screen. While some high-end equipment incorporates simple spring-return or pneumatic floating mechanisms, their primary purpose is to provide constant downward pressure, rather than adapting to the geometric deformation of the substrate surface. Furthermore, traditional maintenance methods often rely on completely disassembling the entire squeegee module, including loosening guide rail fixing screws, disconnecting air pipes and electrical connections, to replace the squeegee blades or perform deep cleaning.

[0003] However, the aforementioned existing technologies have significant limitations in practical applications: First, because the doctor blade is rigidly fixed, when the substrate surface is uneven (such as curved surfaces, steps, or minor bumps), the rigid doctor blade cannot adaptively conform to the surface, resulting in uneven ink pressure distribution. This easily leads to defects such as missed printing, inconsistent ink layer thickness, or even scratching the substrate, seriously affecting the printing yield. Second, existing simple floating structures often lack precise gap control or bidirectional adjustment capabilities, making it difficult to achieve effective surface adhesion while ensuring ink scraping accuracy. Finally, traditional maintenance methods are cumbersome, requiring complete disassembly of the module to replace the doctor blade or adjust its position, resulting in long equipment downtime, low production efficiency, and failing to meet the demands of modern automated production for rapid changeover and efficient maintenance. Therefore, there is an urgent need for a new type of floating doctor blade mechanism that can adapt to uneven surfaces, has flexible pressure adjustment, and is easy to maintain. Summary of the Invention

[0004] This invention discloses a floating squeegee mechanism for an automated screen printing machine, which mainly solves the problems of traditional screen printing squeegee mechanisms being unable to adapt to uneven surfaces, lacking flexible pressure adjustment, and being inconvenient to maintain.

[0005] To achieve the aforementioned objective, the present invention provides a floating squeegee mechanism for an automated screen printing machine, comprising a bracket and a mounting base disposed on the bracket; The mounting base is provided with a linear guide assembly and a synchronous transmission assembly along its length. A movable seat is slidably connected to the linear guide assembly, and the synchronous transmission assembly is used to drive the movable seat to reciprocate along the linear guide assembly. The movable base is provided with a dual scraper assembly, which includes a first scraper and a second scraper. The first scraper is connected to the first drive component via a rigid connector to control the raising and lowering of the first scraper; The second scraper is symmetrically provided with second connecting shafts on both sides. A limiting ring is sleeved on the top of the second connecting shaft. A second connecting block is movably arranged between the limiting ring and the moving seat. A preset gap is formed between the limiting ring and the second connecting block. A second driving component is connected to the bottom of the second connecting block. When the second squeegee contacts the surface of the substrate, the preset gap allows the second squeegee to make adaptive displacement relative to the mounting base to conform to the surface of the substrate.

[0006] Preferably, one end of the mounting base is rotatably connected to the bracket, and the other end is detachably fixed to the bracket by a fixing device; the fixing device includes a locking block and a bolt, the locking block has an adjustment slot, and the bolt passes through the adjustment slot to fix the locking block to the bracket, so that the mounting base can be flipped around the rotatable connection to the maintenance position.

[0007] Preferably, the preset gap is an axial gap with a single-sided width ranging from 0.05mm to 5mm; or, an elastic buffer pad is provided between the limiting ring and the second connecting block, and the elastic buffer pad is compressed by no more than 0.5mm when compressed.

[0008] Preferably, the second connecting shafts on both sides of the second scraper are fitted with detachable counterweights above the second connecting block; the weight range of the counterweights is 5N–20N, and the downward pressure of the second scraper can be adjusted by replacing the counterweights of different weights.

[0009] Preferably, the second driving component is a second telescopic cylinder with a stroke of 10mm–50mm and a working pressure of 0.4MPa–0.8MPa; the first driving component is a first telescopic cylinder, and the timing of their actions is configured such that the first scraper completes its action before the second scraper.

[0010] Preferably, the synchronous transmission assembly includes a motor, a synchronous toothed belt, and a gear. The motor drives the synchronous toothed belt to move, and the gear meshes with the synchronous toothed belt and is fixed inside the movable seat. The linear guide assembly includes two parallel guide rails, and the movable seat is sleeved on the outside of the guide rails.

[0011] Preferably, the bracket is also provided with a flip-limiting block. When the mounting base is flipped to the maintenance position, the limiting block abuts against the side of the base or the locking block, limiting the flip angle to 90°–180°.

[0012] Preferably, in the dual-blade assembly, the first blade is used for ink return, and the second blade is used for ink scraping.

[0013] Preferably, the first connecting shafts are symmetrically arranged on both sides of the first scraper. The tops of the two first connecting shafts are fixedly connected to the first connecting block by bolts. The bottoms of the first connecting shaft and the second connecting shaft are connected to the blade holder. The blade holder includes a first limiting plate and a second limiting plate. The first limiting plate and the second limiting plate are connected by bolts. The first limiting plate has a keyhole groove. A scraping strip is sandwiched between the first limiting plate and the second limiting plate. The scraping strip is provided with a positioning protrusion corresponding to the keyhole groove.

[0014] Preferably, an anti-gravity mechanism is provided on both sides of the bottom of the mounting base. The anti-gravity mechanism is fixedly connected to the mounting base via a connecting column. A first movable plate is provided in the middle of the first movable plate. A first fixed plate is provided on the top of the first movable plate. Two guide shafts are fixedly and symmetrically provided on both sides of the first fixed plate. A second fixed plate is sleeved on the outer side of the guide shaft below the first movable plate. A second movable plate is movably provided below the second fixed plate. The second movable plate is movably connected to the guide shaft, and the second fixed plate is fixedly connected to the guide shaft.

[0015] Preferably, a synchronous motor is also provided at the bottom of the mounting base. The motor is used to drive the screws of the anti-gravity mechanisms on both sides to rotate simultaneously. Rope pulleys are provided on both sides of the first fixed plate. Steel wire ropes are symmetrically arranged on both sides of the first movable plate on both sides of the screw. One end of the steel wire rope is fixedly connected to the movable plate. The other end of the steel wire rope passes upward through the rope pulley of the first fixed plate and then passes through the first movable plate and the second fixed plate in sequence and is fixedly connected to the second movable plate. A weight adjustment plate is also provided at the bottom of the second movable plate.

[0016] The technical solution provided by this invention has at least the following technical effects: In this invention, a single-sided axial gap is reserved between the inner hole of the limiting ring and the outer circle of the second connecting block. In practical applications, the gap size can be finely adjusted according to the roughness of the substrate, and this embodiment does not limit this. This implementation balances the flexibility of floating and the stability of movement by precisely defining the gap range or introducing elastic buffer, ensuring high-precision printing results even on uneven surfaces. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a top view of a partial structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the scraper assembly according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the scraper assembly from another angle according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the counterweight block according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the scraper holder according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the anti-gravity mechanism of the present invention; Key reference numerals in the attached drawings: 10, bracket; 20, mounting base; 21, click; 22, gear; 23, fixing device; 24, guide rail; 25, synchronous toothed belt; 26, rotating shaft; 30, double scraper assembly; 31, first scraper; 311, first connecting shaft; 312, first telescopic cylinder; 313, first connecting block; 32, second scraper; 321, second connecting shaft; 322, limiting ring; 323, second connecting block; 324, second telescopic cylinder; 325, counterweight; 33, movable joint; 34, first limiting plate; 35, second limiting plate; 341, keyhole groove; 41, connecting column; 42, first moving plate; 43, first fixed plate; 44, second fixed plate; 45, second moving plate; 46, rope pulley; 47, wire rope; 48, weight adjustment plate; 49, screw rod; Detailed Implementation Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated 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 intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0019] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention 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 the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] Please refer to Figures 1-6 This invention provides a floating squeegee mechanism for an automated screen printing machine, including a bracket 10 and a mounting base 20 disposed on the bracket 10; a linear guide assembly and a synchronous transmission assembly are disposed on the mounting base 20 along its length; a movable seat is slidably connected to the linear guide assembly, and the synchronous transmission assembly is used to drive the movable seat to reciprocate along the linear guide assembly; a double squeegee assembly 30 is provided on the movable seat, the double squeegee assembly 30 including a first squeegee 31 and a second squeegee 32; the first squeegee 31 is connected to a first driving member through a rigid connecting member to control the second squeegee 32. The first scraper 31 is raised and lowered; the second scraper 32 has symmetrical second connecting shafts 321 on both sides, and a limiting ring 322 is sleeved on the top of the second connecting shaft 321. A second connecting block 323 is movably connected between the limiting ring 322 and the moving seat, and a preset gap is formed between the limiting ring 322 and the second connecting block 323. A second driving component is connected to the bottom of the second connecting block 323. When the second scraper 32 contacts the surface of the substrate, the preset gap allows the second scraper 32 to generate adaptive displacement relative to the mounting seat 20 to conform to the surface of the substrate. In this embodiment, the bracket 10 is welded from high-strength aluminum alloy profiles, and the surface is anodized to prevent corrosion. In this embodiment, the linear guide assembly uses a high-precision linear guide rail 24 (model: HIWIN HGW25CA) to ensure smooth and wobbly movement of the moving seat; the synchronous transmission assembly includes a servo motor (model: Panasonic A6 series), a synchronous toothed belt 25 (model: MXL type), and a precision gear 22; in the double scraper assembly 30, the second connecting shafts 321 on both sides are made of stainless steel, the limiting ring 322 on the top is made of brass, and the second connecting block 323 is an aluminum alloy casting, with a 0.1mm axial gap reserved between them; the second drive component is a pneumatic telescopic cylinder (model: Festo MS6-LR).

[0022] In this embodiment, the weight of the counterweight 325 is transmitted to the fixing ring, which is locked to the outside of the second connecting shaft 321, thereby transmitting gravity to the second connecting shaft 321. The lower ends of the two second connecting shafts 321 are provided with movable joints 33, and finally the gravity is evenly transmitted to both sides of the second scraper 32, thereby realizing the force transmission of the floating constant pressure scraper.

[0023] The working principle is as follows: When the moving seat drives the dual-squeegee assembly 30 to reciprocate along the guide rail 24 above the substrate, if the substrate surface is flat, the second squeegee 32 presses down to print under the action of the second driving component; if there are protrusions on the substrate surface, the reaction force received by the squeegee at the moment of contact will push the second connecting block 323 to overcome gravity, causing a relative displacement between the limiting ring 322 and the connecting block, thereby allowing the second squeegee 32 to be partially raised or tilted, automatically adapting to surface undulations and maintaining a constant effective ink scraping angle and pressure. This implementation method, through a unique gap floating structure, completely solves the problem that rigid squeegees cannot adapt to uneven surfaces, significantly improving the printing yield. At the same time, the dual-squeegee design realizes independent control of ink return and ink scraping, optimizing the printing process.

[0024] In this embodiment, a rotating part is provided at the bottom of one end of the mounting base 20, and the rotating part has a rotating hole. The mounting base 20 is rotatably connected to the base via a rotating shaft 26. The other end is provided with a locking block, which is an L-shaped aluminum alloy part with an adjustment slot that is elongated, 20mm long and 8mm wide, for accommodating M6 bolts. After the bolt passes through the slot, tightening the nut locks the mounting base 20 in a horizontal working position. During maintenance, simply loosen the nut and rotate the entire mounting base 20 180 degrees around the hinge axis. At this time, the scraper assembly is exposed upwards, and the scraper blade or accumulated ink can be quickly replaced or cleaned without disassembling any air pipes or wires. In practical applications, the rotating connection can adopt a pin-shaft and bearing configuration, which is not limited to this embodiment. This implementation utilizes the cooperation of the rotating connection and the detachable locking block to achieve the overall flipping of the scraper mechanism, shortening the disassembly process that originally required several minutes to a few seconds, greatly improving equipment maintenance efficiency and downtime utilization.

[0025] In this embodiment, the axial gap on one side between the inner hole of the limiting ring 322 and the outer circle of the second connecting block 323 is set to 0.1mm. This value is the optimal value determined through numerous experiments: when it is less than 0.05mm, the coefficient of friction between metals increases, resulting in a sluggish response of the squeegee; when it is greater than 5mm, the squeegee will oscillate slightly during high-speed movement, causing fluctuations in ink layer thickness. As an alternative, a 5mm thick polyurethane elastic buffer pad is embedded between the limiting ring 322 and the connecting block. This material has excellent wear resistance and resilience, and the maximum compression under pressure is controlled within 0.4mm, providing both flexible support and ensuring rapid reset. In practical applications, the gap size can be finely adjusted according to the roughness of the substrate; this embodiment does not limit this. This implementation balances the flexibility of floating and the stability of movement by precisely defining the gap range or introducing elastic buffer, ensuring high-precision printing results even on uneven surfaces.

[0026] The counterweight 325 has a weight range of 5N–20N, and the downward pressure of the second scraper 32 can be adjusted by replacing the counterweight 325 with different weights. In this embodiment, the top of the second connecting block 323 is designed with a counterweight groove composed of threaded blind holes, into which a standard stainless steel counterweight 325 can be screwed. The counterweight 325 has four weight specifications: 5N, 10N, 15N, and 20N, which users can flexibly select according to the type of substrate (e.g., PCB boards require light pressure, while glass requires heavy pressure). For example, a 5N counterweight 325 is used when printing flexible circuit boards to avoid damaging the circuit; a 20N counterweight 325 is used when printing rigid acrylic boards to ensure sufficient ink transfer. In practical applications, the counterweight 325 can also be designed as a magnetic or snap-on type, which is not limited in this embodiment. This implementation, through modular counterweight design, gives the scraper mechanism broad adaptability, allowing it to cope with different working conditions without changing the cylinder or adjusting the air pressure parameters, significantly reducing equipment debugging costs and operating difficulty.

[0027] In this embodiment, the second telescopic cylinder 324 is a compact cylinder with a piston diameter of 25mm and a stroke set to 20mm, which is sufficient to cover the maximum height deviation of the substrate. The working pressure is set at 0.6MPa, which ensures sufficient ink-scraping force while avoiding mechanical impact caused by excessive pressure. The control system sets the timing through PLC: first, the first drive unit is activated, driving the first doctor blade 31 to complete the ink return action and reset; after the first doctor blade 31 confirms its position, the second drive unit is activated after a 100ms delay, driving the second doctor blade 32 to press down and scrape ink. This staggered timing strategy effectively prevents ink agitation or ink overflow that may be caused by the simultaneous action of the two doctor blades. In practical applications, the drive unit can also be an electric push rod, which is not limited in this embodiment. This implementation ensures the accuracy of the dual doctor blades working together through precise pneumatic parameter control and logical timing optimization, further improving the clarity and edge sharpness of the printed pattern.

[0028] In this embodiment, the synchronous toothed belt 25 is made of high-tensile polyester core belt, and the gear 22 has a module of 0.8mm and is made of tempered steel, ensuring smooth transmission and low noise. The moving seat has precision bearing holes machined inside and contains a wear-resistant bushing (made of oil-impregnated bronze). This bushing is directly fitted onto the outside of the two parallel guide rails 24 (model: THK SRH25), forming a rolling friction pair. The wear-resistant bushing not only reduces direct friction between the moving seat and the guide rails 24, extending the service life of the guide rails 24, but also automatically compensates for minor installation errors, ensuring that the moving seat maintains a strictly horizontal posture during long-stroke reciprocating motion and preventing the doctor blade from tilting. In practical applications, the wear-resistant bushing can also be replaced with an engineering plastic slider; this embodiment does not limit this. This implementation significantly improves the operating accuracy and durability of the equipment through an optimized transmission structure and wear-resistant guiding design, ensuring printing consistency during long-term continuous production.

[0029] In this embodiment, first connecting shafts 311 are symmetrically arranged on both sides of the first scraper 31. The tops of the two first connecting shafts 311 are fixedly connected to the first connecting block 313 by bolts. The bottoms of the first connecting shafts 311 and the second connecting shaft 321 are connected to a blade holder. The blade holder includes a first limiting plate 34 and a second limiting plate 35. The first limiting plate 34 and the second limiting plate 35 are connected by bolts. The first limiting plate 34 has a keyhole groove 341. A scraper strip is sandwiched between the first limiting plate 34 and the second limiting plate 35. The scraper strip is provided with positioning protrusions corresponding to the keyhole groove 341. When installing the scraper strip, the positioning protrusions on both sides of the scraper strip are first inserted into the large round hole of the keyhole groove 341, and then slid and clamped along the narrow groove to achieve initial fixation. Then, the first limiting plate 34 and the second limiting plate 35 are connected by bolts to completely fix the scraper strip.

[0030] According to a preferred embodiment of the present invention, the bracket 10 is further provided with a flipping limit block. When the mounting base 20 is flipped to the maintenance position, the limit block abuts against the side of the base or the locking block, limiting the flipping angle to 90°–180°.

[0031] Please refer to Figure 7 According to another preferred embodiment of the present invention, the mounting base 20 in this embodiment is provided with anti-gravity mechanisms on both sides of the bottom. The anti-gravity mechanisms are fixedly connected to the mounting base 20 via connecting columns 41. A first movable plate 42 is provided in the middle of the first movable plate 42. A first fixed plate 43 is provided on the top of the first movable plate 42. Two guide shafts are fixedly and symmetrically provided on both sides of the first fixed plate 43. A second fixed plate 44 is sleeved on the outer side of the guide shaft below the first movable plate 42. A second movable plate 45 is movably provided below the second fixed plate 44. The second movable plate 45 is movably connected to the guide shaft, and the second fixed plate 44 is fixedly connected to the guide shaft.

[0032] A synchronous motor is also provided at the bottom of the mounting base 20. The motor is used to drive the screw rods 49 of the anti-gravity mechanisms on both sides to rotate simultaneously. Rope pulleys 46 are provided on both sides of the first fixed plate 43. Steel wire ropes 47 are symmetrically arranged on both sides of the first moving plate 42. One end of the steel wire rope 47 is fixedly connected to the moving plate. The other end of the steel wire rope 47 passes upward through the rope pulleys 46 of the first fixed plate 43 and then passes through the first moving plate 42, the second fixed plate 44 and the second moving plate 45 in sequence and is fixedly connected. A weight adjustment piece 48 is also provided at the bottom of the second moving plate 45.

[0033] During operation, the synchronous single machine drives the spiral screws 49 on both sides to rotate, thereby driving the first moving plate 42 and the second moving plate 45 to move up and down, which in turn drives the mounting base 20 to move. The effect of gravity buffering is achieved through the steel wire rope 47 and the weight adjustment plate 48 at the bottom of the second moving plate 45.

[0034] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A floating squeegee mechanism for an automated screen printing machine, comprising a bracket (10) and a mounting base (20) disposed on the bracket (10); characterized in that: The mounting base (20) is provided with a linear guide assembly and a synchronous transmission assembly along its length; A movable seat is slidably connected to the linear guide assembly, and the synchronous transmission assembly is used to drive the movable seat to reciprocate along the linear guide assembly. The movable seat is provided with a double scraper assembly (30), which includes a first scraper (31) and a second scraper (32); The first scraper (31) is connected to the first drive member through a rigid connector to control the lifting and lowering of the first scraper (31); The second scraper (32) is symmetrically provided with second connecting shafts (321) on both sides. A limiting ring (322) is sleeved on the top of the second connecting shaft (321). A second connecting block (323) is movably arranged between the limiting ring (322) and the moving seat. A preset gap is formed between the limiting ring (322) and the second connecting block (323). A second driving member is connected to the bottom of the second connecting block (323). When the second scraper (32) contacts the surface of the substrate, the preset gap allows the second scraper (32) to generate an adaptive displacement relative to the mounting base (20) to conform to the surface of the substrate.

2. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: One end of the mounting base (20) is rotatably connected to the bracket (10), and the other end is detachably fixed to the bracket (10) by a fixing device (23). The fixing device (23) includes a locking block and a bolt. The locking block has an adjustment slot. The bolt passes through the adjustment slot to fix the locking block to the bracket (10), so that the mounting base (20) can be flipped around the rotatable connection to the maintenance position.

3. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: The preset gap is an axial gap with a single-sided width ranging from 0.05mm to 5mm; or, an elastic buffer pad is provided between the limiting ring (322) and the second connecting block (323), and the elastic buffer pad is compressed by no more than 0.5mm when under pressure.

4. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: The second connecting shafts (321) on both sides of the second scraper (32) are fitted with detachable counterweights (325) above the second connecting block (323); the weight range of the counterweights (325) is 5N–20N, and the downward pressure of the second scraper (32) can be adjusted by replacing the counterweights (325) of different weights.

5. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: The second driving component is a second telescopic cylinder (324), with a stroke of 10mm–50mm and a working pressure of 0.4MPa–0.8MPa; the first driving component is a first telescopic cylinder (312), and the timing of their actions is configured such that the first scraper (31) completes its action before the second scraper (32).

6. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: The synchronous transmission assembly includes a motor, a synchronous toothed belt (25), and a gear (22). The motor drives the synchronous toothed belt (25) to move, and the gear (22) meshes with the synchronous toothed belt (25) and is fixed inside the movable seat. The linear guide assembly includes two parallel guide rails (24), and the movable seat is sleeved on the outside of the guide rails (24).

7. The floating squeegee mechanism of an automated screen printing machine according to claim 2, characterized in that: The bracket (10) is also provided with a flipping limit block. When the mounting base (20) is flipped to the maintenance position, the limit block abuts against the side of the base or the card block, limiting the flipping angle to 90°–180°.

8. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: The first scraper (31) has symmetrical first connecting shafts (311) on both sides. The tops of the two first connecting shafts (311) are fixedly connected to the first connecting block (313) by bolts. The bottoms of the first connecting shaft (311) and the second connecting shaft (321) are connected to a blade holder. The blade holder includes a first limiting plate (34) and a second limiting plate (35). The first limiting plate (34) and the second limiting plate (35) are connected by bolts. A scraping strip is sandwiched between the first limiting plate (34) and the second limiting plate (35). The first limiting plate (34) has a keyhole groove (341). The scraping strip has a positioning protrusion corresponding to the keyhole groove (341).

9. The floating squeegee mechanism of an automated screen printing machine according to claim 1, characterized in that: The mounting base (20) is provided with anti-gravity mechanisms on both sides of the bottom. The anti-gravity mechanisms are fixedly connected to the mounting base (20) via connecting columns (41) and a first movable plate (42). A spiral screw (49) is provided in the middle of the first movable plate (42). A first fixed plate (43) is provided on the top of the first movable plate (42). Two guide shafts are fixedly and symmetrically arranged on both sides of the first fixed plate (43). A second fixed plate (44) is sleeved on the outer side of the guide shaft below the first movable plate (42). A second movable plate (45) is movably arranged below the second fixed plate (44). The second movable plate (45) is movably connected to the guide shaft, and the second fixed plate (44) is fixedly connected to the guide shaft.

10. The floating squeegee mechanism of an automated screen printing machine according to claim 9, characterized in that: A synchronous motor is also provided at the bottom of the mounting base (20). The motor is used to drive the screw rods (49) of the anti-gravity mechanism on both sides to rotate simultaneously. Rope pulleys (46) are provided on both sides of the first fixed plate (43). Steel wire ropes (47) are symmetrically arranged on both sides of the first moving plate (42) on both sides of the screw rod (49). One end of the steel wire rope (47) is fixedly connected to the moving plate. The other end of the steel wire rope (47) passes upward through the rope pulleys (46) of the first fixed plate (43) and then passes through the first moving plate (42), the second fixed plate (44), and is fixedly connected to the second moving plate (45). A weight adjustment piece (48) is also provided at the bottom of the second moving plate (45).

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