A screen positioning mechanism of an automatic silk screen printing machine

Abstract

The utility model belongs to the screen printing technical field, concretely relates to a screen positioning mechanism of automatic silk screen printing machine, including support, the support top symmetry is provided with mounting seat, and the both sides mounting seat between detachably erects and has two positioning cross beams, the positioning mechanism still includes the adjusting mechanism of detachable installation, the bottom of screen frame is provided with extension piece, the adjusting mechanism includes micrometer screw, adjusting seat, moving block and the block that touches, adjusting seat passes through bolt and array distribution's mounting hole and is detachably fixed on mounting seat or positioning cross beam, micrometer screw passes through adjusting hole on adjusting seat and is fixedly connected with moving block, moving block is connected with the block that touches through bolt, the block that touches is used for abutting the extension piece to realize the secondary fine positioning of screen, still is equipped with elastic element in adjusting seat, elastic element is located between adjusting seat and moving block, is used for driving moving block reset.

Description

Technical Field

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

[0002] In the field of screen printing technology, accurate screen positioning is crucial for ensuring printing registration accuracy and quality. Existing screen positioning devices typically use integrated clamps or simple bolt tightening to directly fix the screen frame to the machine's positioning beam or mounting base. This traditional positioning method relies heavily on manual experience for rough adjustments, fixing the screen position by tightening bolts. However, in actual production, due to factors such as screen tensioning errors, machine vibration, or thermal expansion and contraction, the screen often experiences slight positional deviations. Current technology lacks effective fine-tuning methods; operators usually need to completely loosen all fixing bolts, reposition the screen, and re-tighten them. This process is not only time-consuming and labor-intensive but also fails to achieve millimeter-level positioning accuracy, severely impacting printing registration rate and product yield. Furthermore, traditional fixing methods are prone to wear and tear on the positioning holes or deformation of the frame due to repeated disassembly and reassembly when frequently changing screens, reducing the equipment's durability and lifespan.

[0003] However, the aforementioned existing technologies have significant limitations in practical applications: First, they lack a refined adjustment mechanism, making it impossible to achieve millimeter-level correction of the screen position, thus hindering high-precision printing; second, the positioning structures are mostly rigid clamping, lacking elastic buffering or rapid reset functions, requiring the loosening of bolts one by one when changing screens, resulting in cumbersome operation and low production efficiency; third, traditional single-point or simple multi-point fixing is difficult to adapt to the universal needs of screens of different sizes, resulting in poor versatility. Therefore, there is an urgent need to develop an automated screen printing machine screen positioning mechanism that can achieve a combination of rapid coarse positioning and precise fine adjustment, is easy to operate, and has high positioning accuracy. Utility Model Content

[0004] This utility model discloses a screen printing plate positioning mechanism for an automated screen printing machine, which mainly solves the problem of the lack of precision in the current traditional screen printing plate positioning mechanism.

[0005] To achieve the aforementioned objective, this utility model provides a screen printing plate positioning mechanism for an automated screen printing machine, comprising a bracket, wherein mounting seats are symmetrically arranged on the top of the bracket, and two positioning beams are detachably mounted between the two mounting seats, wherein the two ends of the positioning beams are connected to the mounting seats through connectors. It also includes a rectangular screen, the outer side of which is provided with a border, and the two sides of the border are symmetrically provided with fixing slots; Two positioning components are movably arranged in each side of the fixed slot. One end of each positioning component is provided with a bolt and a nut at the bottom. The positioning component is fixed in any position in the slot by the cooperation of the bolt and the nut. Two fasteners are provided above each of the positioning beams. The fasteners are detachably connected to the positioning beams by bolts, and a limit gap is provided between the fasteners and the positioning beams. The other end of the positioning component is clamped in the limiting gap between the fixing component and the positioning beam, thereby completing the four-point positioning of the screen. The positioning mechanism also includes an adjustment mechanism that can be detachably installed on the mounting base or the positioning beam, and an extension is provided at the bottom of the screen frame; The adjustment mechanism includes a micrometer screw, an adjustment seat, a moving block, and a contact block. The adjustment seat is detachably fixed to a mounting base or a positioning beam by bolts and an array of mounting holes. The micrometer screw passes through the adjustment hole on the adjustment seat and is fixedly connected to the moving block. The moving block is connected to the contact block by bolts. The contact block is used to abut against the extension to achieve secondary fine positioning of the screen. An elastic element is also sleeved inside the adjusting seat. The elastic element is located between the adjusting seat and the moving block and is used to drive the moving block to reset.

[0006] Preferably, the positioning member has an L-shaped structure, with one end extending through the fixing groove into the limiting gap. A bolt passes through the head of the positioning member, and a nut is tightened on the outside of the fixing groove to lock the position.

[0007] Preferably, both the adjusting seat and the moving block are U-shaped structures. Guide rods are symmetrically arranged on both sides of the adjusting seat, and guide holes corresponding to the guide rods are opened on the moving block. The guide rods are used to limit the movement trajectory of the moving block. The elastic element is a spring sleeved on the outside of the guide rod.

[0008] Preferably, a scale cylinder is sleeved on the outer side of the micrometer screw, the scale cylinder being used to display the extension length of the micrometer screw; the front end face of the abutment block is flat, for close contact with the end face of the extension member.

[0009] Preferably, the adjustment mechanism is configured in two sets. The first set of adjustment mechanisms is installed on the mounting base for adjusting the vertical position of the screen, and the second set of adjustment mechanisms is installed on the positioning beam for adjusting the horizontal position of the screen.

[0010] Preferably, the extension is a bolt, with its threaded end screwed into the threaded hole at the bottom of the screen frame, and the smooth end serving as the contact surface.

[0011] Preferably, the connector is located above the positioning beam, and the first end of the connector is detachably connected to the positioning beam by bolts, while the other end of the connector is fixedly connected to the mounting base.

[0012] The technical solution provided by this utility model has at least the following technical effects: Dual positioning for doubled accuracy: A pioneering segmented positioning mode combining "four-point slot coarse positioning + micrometer screw fine adjustment" is employed. First, the slots and sliding positioning components quickly fix the screen and ensure dimensional adaptation, eliminating large errors. Then, the micrometer screw pushes the contact block for millimeter-level fine adjustment, completely solving the problem of insufficient accuracy in traditional methods and significantly improving printing registration accuracy.

[0013] Highly efficient and convenient for rapid screen replacement: Utilizing a micrometer screw in conjunction with a spring reset mechanism, a smooth "adjustment-locking-reset" operation cycle is achieved. After releasing the micrometer screw, the spring automatically retracts the contact block, eliminating the need for manual reset. This significantly reduces screen replacement and adjustment time, greatly improving production efficiency and equipment utilization.

[0014] High versatility and flexible adaptation: The unique "slot + sliding positioning component" design allows the same mechanism to adapt to screen borders of different widths, simply by adjusting the position of the positioning component within the slot; at the same time, the adjustment mechanism can be flexibly installed on the mounting base or positioning beam to achieve fine-tuning in the up-down or left-right dimensions, meeting the all-round positioning needs under complex working conditions.

[0015] Sturdy structure and long service life: The U-shaped adjustment seat and guide rod design effectively prevent the moving block from deflecting under force, ensuring the stability of adjustment and repeatability of positioning accuracy; the application of elastic elements avoids hard collisions, protects the screen frame and adjustment components, and extends the service life of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the adjustment structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention with an adjustment structure installed on the side of the frame; Key reference numerals in the attached drawings: 10. Mounting base; 11. Positioning beam; 111. Fixing component; 12. Screen; 121. Frame; 122. Fixing slot; 123. Positioning component; 124. Extension component; 13. Connecting component; 14. Adjustment mechanism; 141. Adjustment seat; 142. Micrometer screw; 1421. Scale cylinder; 143. Guide rod; 144. Moving block; 145. Abutment block; 146. Spring; Detailed Implementation

[0018] 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 intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0019] In the description of the embodiments of this utility model, 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 drawings. They are only for the convenience of describing the embodiments of 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.

[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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] Please refer to Figures 1-2This utility model provides a screen printing plate positioning mechanism for an automated screen printing machine, including a bracket. The bracket has symmetrically arranged mounting seats 10 on its top, and two positioning beams 11 are detachably mounted between the two mounting seats 10. The two ends of the positioning beams 11 are connected to the mounting seats 10 via connectors 13. The machine also includes a rectangular screen, with a frame 121 on its outer side. The frame 121 has symmetrically arranged fixing slots 122 on both sides. Two positioning members 123 are movably arranged within each fixing slot 122. One end of each positioning member 123 is provided with a bolt and a nut at its bottom. The bolt and nut work together to fix the positioning member 123 in any position in the slot; two fixing members 111 are provided above each of the positioning beams 11, and the fixing members 111 are detachably connected to the positioning beams 11 by bolts, with a limit gap between the fixing members 111 and the positioning beams 11; the other end of the positioning member 123 is clamped in the limit gap between the fixing members 111 and the positioning beams 11, thereby completing the initial four-point positioning; it also includes an adjustment mechanism 14 that can be detachably installed on the mounting base 10, and extension members 124 are provided at the bottom of both sides of the frame 121. The extension 124 is a bolt; the adjustment mechanism 14 includes a micrometer screw 142 and an adjustment seat 141 fixedly connected to the micrometer screw 142. The bottom of the adjustment seat 141 has several mounting holes arranged in an array of two holes per group. The adjustment seat 141 is detachably connected to the mounting seat 10 via bolts and mounting holes. The micrometer screw 142 is fixedly connected to the adjustment seat 141 via a moving block 144. The moving block 144 is bolted to an abutment block 145. The adjustment seat 141 has an adjustment hole through which the micrometer screw 142 extends into the adjustment seat 141. Guide rods 143 are symmetrically arranged on both sides of the adjustment hole of the adjustment seat 141. Both the adjustment seat 141 and the moving block 144 are U-shaped structures. A fixing bolt for fixing the guide rod 143 is provided on one side of the adjustment seat 141. The other end of the guide rod 143 abuts against the inner wall of the other side of the adjustment seat 141. One side of the moving block 144 is located inside the adjustment seat 141. The part of the moving block 144 located inside the adjustment seat 141 has a guide hole corresponding to the guide rod 143. An elastic element is sleeved on the outside of the guide rod 143 between the moving block 144 and the adjustment seat 141. The elastic element is preferably a spring 146.

[0022] In this embodiment, a high-life compression spring 146 (wire diameter Φ1.5mm, stiffness coefficient 5N / mm) is selected as the elastic element; a precision ball screw (pitch 1mm) is selected as the micrometer screw 142, which is matched with a graduated cylinder 1421 (minimum graduation value 0.01mm). The working principle is as follows: First, the screen is placed between the two positioning beams 11, the sliding positioning member 123 is moved to the appropriate position and locked, so that the end of the positioning member 123 is inserted into the limiting gap to achieve four-point coarse positioning; then, the micrometer screw 142 is rotated to push the moving block 144 to drive the abutment block 145 to move forward. The end face of the abutment block 145 abuts against the screen extension member 124. Millimeter-level displacement adjustment is achieved through the precision transmission ratio of the micrometer screw 142, while the spring 146 provides a constant preload to eliminate the gap; after the adjustment is completed, the micrometer screw 142 is released, and the spring force of the spring 146 automatically pushes the moving block 144 to reset, which facilitates quick disassembly of the screen. This implementation method achieves rapid clamping and high-precision fine-tuning of the screen printing plate through a dual positioning mechanism, solving the pain points of poor accuracy and low efficiency of traditional equipment.

[0023] In this embodiment, the positioning element 123 is a rectangular block structure. In practical applications, the positioning element 123 can also be designed as an L-shaped or T-shaped structure, as long as it can slide within the slot and be inserted into the gap. This embodiment does not limit this. This implementation method, through reasonable geometric design, ensures the stability and flexibility of the coarse positioning stage, laying a solid foundation for subsequent fine-tuning.

[0024] In this embodiment, the guide rod 143 is connected to the adjusting seat 141 at both ends via bearings or bushings to reduce frictional resistance. The U-shaped adjusting seat 141 and the moving block 144 provide good torsional stiffness, ensuring that the moving block 144 can only move linearly along the axial direction and will not tilt. The preload of the spring 146 is set to 10N, which ensures that the contact block 145 fits tightly against the extension 124 and can quickly reset when the screw is released. In practical applications, the elastic element can also be a rubber buffer pad or a disc spring 146, which is not limited in this embodiment. This implementation ensures the smoothness, accuracy, and ease of operation of the fine-tuning process through the synergistic effect of guidance and reset.

[0025] In this embodiment, the micrometer screw 142 has a pitch of 0.5 mm, and each division of the scale cylinder 1421 represents 0.01 mm, allowing the operator to clearly read the adjustment values. The front surface of the contact block 145 is ground to a roughness Ra≤0.4μm, ensuring a large-area surface contact with the extension member 124 and avoiding stress concentration or slippage caused by point contact. In practical applications, the scale cylinder 1421 can also be replaced with a digital display or a laser rangefinder sensor; this embodiment does not limit this. This implementation greatly improves the accuracy and repeatability of the adjustment and reduces human error through the visual reading function.

[0026] Please refer to Figure 3 According to another preferred embodiment of the present invention, in this embodiment, the adjustment mechanism 14 is configured in two sets. The first set of adjustment mechanisms 14 is mounted on the mounting base 10 for adjusting the vertical position of the screen, and the second set of adjustment mechanisms 14 is mounted on the positioning beam 11 for adjusting the horizontal position of the screen. In this embodiment, the two sets of adjustment mechanisms 14 are completely independently controlled and do not interfere with each other. The adjustment mechanism 14 on the mounting base 10 acts vertically on the bottom extension 124 of the screen to achieve fine adjustment of the Y-axis; the adjustment mechanism 14 on the positioning beam 11 acts horizontally on the side extension 124 of the screen to achieve fine adjustment of the X-axis. In practical applications, a single or double set configuration can be selected according to actual needs, or even a Z-axis adjustment mechanism 14 can be added. This embodiment does not limit this. This implementation achieves high-precision positioning of the screen in the entire plane through a flexible bidirectional layout, meeting the needs of complex printing processes.

[0027] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screen positioning mechanism for an automated screen printing machine, comprising a bracket, wherein mounting seats (10) are symmetrically arranged on the top of the bracket, and two positioning beams (11) are detachably mounted between the two mounting seats (10), wherein the two ends of the positioning beams (11) are connected to the mounting seats (10) through connectors (13); Its features are: It also includes a rectangular screen, the outer side of which is provided with a frame (121), and the two sides of the frame (121) are symmetrically provided with fixing slots (122); Two positioning members (123) are movably arranged in the fixed slot (122) on each side. One end of the positioning member (123) is provided with a bolt and a nut at the bottom. The positioning member (123) is fixed in any position in the slot by the cooperation of the bolt and the nut. Two fasteners (111) are provided above each of the positioning beams (11). The fasteners (111) and the positioning beams (11) are detachably connected by bolts. A limit gap is provided between the fasteners (111) and the positioning beams (11). The other end of the positioning member (123) is clamped in the limiting gap between the fixing member (111) and the positioning beam (11), thereby completing the four-point positioning of the screen. The positioning mechanism also includes an adjustment mechanism (14) that can be detachably installed on the mounting base (10) or the positioning beam (11), and an extension (124) is provided at the bottom of the frame (121); The adjustment mechanism (14) includes a micrometer screw (142), an adjustment seat (141), a moving block (144), and a contact block (145). The adjustment seat (141) is detachably fixed to the mounting seat (10) or the positioning beam (11) by bolts and an array of mounting holes. The micrometer screw (142) passes through the adjustment hole on the adjustment seat (141) and is fixedly connected to the moving block (144). The moving block (144) is bolted to the contact block (145). The contact block (145) is used to abut against the extension member (124) to achieve secondary fine positioning of the screen. An elastic element is also sleeved inside the adjusting seat (141). The elastic element is located between the adjusting seat (141) and the moving block (144) and is used to drive the moving block (144) to reset.

2. The screen printing positioning mechanism according to claim 1, characterized in that: The positioning element (123) has an L-shaped structure. One end of it passes through the fixing slot (122) and extends into the limiting gap. The positioning element (123) is locked in position by bolts through the head of the positioning element (123) and nuts are tightened on the outside of the fixing slot (122).

3. The screen printing positioning mechanism according to claim 1, characterized in that: Both the adjusting seat (141) and the moving block (144) are U-shaped structures. The adjusting seat (141) is symmetrically provided with guide rods (143) on both sides. The moving block (144) is provided with guide holes corresponding to the guide rods (143). The guide rods (143) are used to limit the movement trajectory of the moving block (144). The elastic element is a spring (146) sleeved on the outside of the guide rods (143).

4. The screen printing positioning mechanism according to claim 1, characterized in that: The micrometer screw (142) is fitted with a scale cylinder (1421) on its outer side, which is used to display the extension length of the micrometer screw (142); the front end face of the abutment block (145) is flat, which is used to fit tightly with the end face of the extension member (124).

5. The screen printing positioning mechanism according to claim 1, characterized in that: The adjustment mechanism (14) is configured in two sets. The first set of adjustment mechanism (14) is installed on the mounting base (10) for adjusting the vertical position of the screen, and the second set of adjustment mechanism (14) is installed on the positioning beam (11) for adjusting the horizontal position of the screen.

6. The screen printing positioning mechanism according to claim 1, characterized in that: The extension member (124) is a bolt, the threaded end of which is screwed into the threaded hole at the bottom of the frame (121), and the smooth end serves as the contact surface.

7. The screen printing positioning mechanism according to claim 1, characterized in that: The connector (13) is located above the positioning beam (11). The first end of the connector (13) is detachably connected to the positioning beam (11) by bolts, and the other end of the connector (13) is fixedly connected to the mounting base (10).

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