Precise positioning mechanism for printing direction of screen printing plate

Abstract

The invention discloses a screen printing plate printing direction precise positioning mechanism which comprises a machine table and a rack fixedly arranged on the rear side of the top of the machine table, and a printing platform is fixedly arranged on the portion, located on the front side of the rack, of the machine table. A transversely-arranged printing cross beam is fixedly installed on the front side of the rack. The defects that due to the fact that manual alignment or a single mechanical positioning structure is mostly adopted for positioning of an existing silk-screen printing plate, the positioning efficiency is low, and the direction of the screen printing plate deviates easily are overcome, magnetic attraction is adopted for auxiliary positioning, the positioning speed is greatly increased, meanwhile, up-down hydraulic locking positioning and clamping positioning cooperation from the two sides are adopted, and the positioning precision is greatly improved. Therefore, after long-term use, the situation of positioning looseness caused by mechanical clearance or vibration can be avoided, the long-term stability of the printing direction is greatly guaranteed, the percent of pass and the production efficiency of printed products are guaranteed, the problems that manual alignment is slow and easy to shift are solved, the structure is simple, and the practicability is high. And popularization and use are facilitated.

Description

Technical Field

[0001] This invention relates to the field of printing positioning technology, and in particular to a precise positioning mechanism for screen printing plate direction. Background Technology

[0002] In screen printing, the precise positioning of the screen is crucial to the printing quality, as its positioning accuracy directly affects the matching degree between the printing direction of the pattern and the substrate.

[0003] Currently, screen printing stencil positioning mostly employs manual alignment or a single mechanical positioning structure. Manual alignment relies on operators visually observing and adjusting the relative position of the stencil to a positioning reference. This is not only inefficient but also highly susceptible to human experience and operational conditions, easily leading to skewing of the stencil and resulting in distorted printed patterns. While single mechanical positioning (such as the interaction of positioning pins and holes) can achieve a certain degree of positioning, frequent adjustments to the positioning components are required when changing to different stencil sizes, making the operation cumbersome and lacking adaptability. Furthermore, long-term use can lead to loosening of the positioning due to mechanical clearances or vibrations, making it difficult to guarantee the long-term stability of the printing direction, thus affecting the pass rate and production efficiency of printed products.

[0004] To address the issues of slow and prone-to-misalignment during manual alignment, this invention proposes a precise positioning mechanism for screen printing direction. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a precise positioning mechanism for screen printing plate printing direction.

[0006] This invention proposes a precise positioning mechanism for screen printing, comprising a machine base and a frame fixedly mounted on the rear side of the top of the machine base. A printing platform is fixedly mounted on the machine base located on the front side of the frame. A horizontally arranged printing beam is fixedly installed on the front side of the frame. A slide groove is provided on the front side of the printing beam. A displacement adjustment mechanism is provided in the slide groove. Two sliding housings are movably installed in the slide groove through the displacement adjustment mechanism. Screen clamping fasteners are fixedly connected to the front sides of the two sliding housings through support frames. Each of the two screen clamping fasteners has a U-shaped clamping groove on the side closest to each other for clamping the screen printing mesh frame. A screen printing mesh sheet is fixedly connected to the inner bottom of the screen printing mesh frame. A mechanical locking composite fixing mechanism is provided in the U-shaped clamping groove for clamping and fixing the screen printing mesh frame. A magnetic suction auxiliary positioning mechanism is also provided in the U-shaped clamping groove for magnetic suction auxiliary positioning of the screen printing mesh frame.

[0007] The displacement adjustment mechanism includes a lead screw fixedly installed in the slide groove, a lead screw transmission tube rotatably installed in the sliding housing, the lead screw transmission tube being sleeved on the lead screw and threadedly connected to the lead screw; a servo motor is fixedly installed on the inner wall of the top side of the sliding housing by a mounting bracket, a drive gear is fixedly sleeved on the output shaft of the servo motor, a driven gear is fixedly sleeved on the lead screw transmission tube, and the drive gear and the driven gear are engaged in transmission.

[0008] The mechanical locking composite fixing mechanism includes a clamping and fixing head disposed in a U-shaped clamping groove, and the clamping and fixing head is used to clamp and fix the screen printing mesh frame; an electro-hydraulic cylinder is fixedly installed on the top of the mesh clamp fixing component, and the piston end of the electro-hydraulic cylinder moves through the U-shaped clamping groove and is fixedly connected to the clamping and fixing head.

[0009] As a further part of the present invention, the magnetic suction auxiliary positioning mechanism includes an embedding groove at the corner of the inner wall of the bottom of the U-shaped clamping groove, an electromagnet is fixedly installed in the embedding groove, and a groove is provided at the bottom corner of the screen printing frame, an iron block is fixedly embedded in the groove, and the electromagnet and the iron block are pre-set to be corresponding positioning references at the top and bottom and are positioned and cooperated by magnetic suction.

[0010] As a further embodiment of the present invention, the mechanical locking composite fixing mechanism further includes two adapters fixedly mounted on the side wall of the U-shaped clamping groove. Each adapter is rotatably connected to a locking bracket for locking and positioning the side of the clamping and fixing head, and the two locking brackets are arranged obliquely and symmetrically. A limiting ball head is also movably mounted between the two locking brackets. An auxiliary hydraulic cylinder is also fixedly mounted on the side wall of the U-shaped clamping groove through a placement groove. A piston push rod is movably mounted on the auxiliary hydraulic cylinder, and the other end of the piston push rod is fixedly connected to the limiting ball head. A fixing frame is fixedly mounted on the adapter, and a reset spring is provided between the fixing frame and the locking bracket. The electro-hydraulic cylinder and the auxiliary hydraulic cylinder are also connected through a hydraulic pipeline, and a solenoid valve is provided on the hydraulic pipeline.

[0011] As a further part of the present invention, a through hole is provided on the top inner wall of the placement groove, and a hydraulic pipe passes through the through hole.

[0012] As a further part of the present invention, mounting holes are provided on both sides of the inner wall of the sliding housing, and bearings are fixedly installed in the mounting holes. The two ends of the lead screw transmission tube are respectively rotatably mounted on the two bearings.

[0013] As a further part of the present invention, guide sliders are provided on the top and bottom sides of the sliding housing, and guide grooves are provided on the top and bottom inner walls of the slide groove, and the guide sliders are slidably installed in the guide grooves in the horizontal direction.

[0014] As a further aspect of the present invention, the support frame is generally L-shaped, with the top side of the L-shape of the support frame connected to the sliding housing, and the bottom side of the L-shape of the support frame fixedly connected to the top of the mesh clamp fixing member.

[0015] As a further part of the present invention, the machine base is equipped with a controller, which is electrically connected to the servo motor, the electro-hydraulic cylinder, the auxiliary hydraulic cylinder, and the solenoid valve.

[0016] The beneficial effects of this invention are:

[0017] 1. In this invention, by setting a displacement adjustment mechanism, the relative position between the two screen printing frame clamps can be adjusted according to the width of the screen printing frame, so that the screen printing frame can be placed relatively quickly and accurately in the U-shaped clamping groove of the two screen printing frame clamps.

[0018] 2. In this invention, by setting up a magnetic auxiliary positioning mechanism, when the screen printing frame is placed in the U-shaped groove, an electromagnet is embedded at the positioning reference point of the bottom inner wall corner of the U-shaped groove, and an iron block is embedded at the corresponding position of the positioning reference point of the bottom corner of the screen printing frame. When the screen printing frame approaches, the electromagnet generates magnetism after being energized and magnetically attracts the iron block. This can achieve pre-positioning of the screen printing frame and quickly find the correct direction.

[0019] 3. In this invention, by setting up a mechanical locking composite fixing mechanism, not only can the piston end of the electro-hydraulic cylinder extend hydraulically, allowing the clamping and fixing head to press and fix the screen printing mesh frame from the top; also, by extending the piston push rod on the auxiliary hydraulic cylinder hydraulically, the limiting ball head is moved to the right, thereby causing the locking bracket to rotate and open outward based on the adapter and compressing the reset spring. This allows the two locking brackets to clamp the screen printing mesh frame from both sides after they are rotated open, preventing loosening from the side. This not only takes into account the positioning speed but also ensures the stability of the positioning direction, solving the problems of slow and easy deviation in manual alignment in the past.

[0020] In summary, this invention avoids the drawbacks of existing screen printing stencils, which often rely on manual alignment or a single mechanical positioning structure, resulting in low positioning efficiency and a tendency for stencil orientation deviation. By employing magnetic-assisted positioning, the positioning speed is greatly improved. Furthermore, the use of upper and lower hydraulic locking and clamping positioning from both sides ensures more secure positioning and reduces the likelihood of deviation. This prevents loosening due to mechanical gaps or vibrations over long-term use, significantly ensuring the long-term stability of the printing direction, guaranteeing the pass rate of printed products and production efficiency. It also solves the problems of slow and easily misaligned manual alignment, and its simple structure facilitates widespread adoption. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the structure of a screen printing plate precision positioning mechanism proposed in this invention;

[0022] Figure 2 This is a partial structural schematic diagram of the present invention;

[0023] Figure 3 For the present invention Figure 2 Enlarged structural diagram of section A;

[0024] Figure 4 This is a cross-sectional view of the printed crossbeam and sliding housing of the present invention.

[0025] Figure 5 For the present invention Figure 4 Enlarged structural diagram of part B.

[0026] In the diagram: 1. Machine base; 2. Machine frame; 3. Printing platform; 4. Printing beam; 401. Slide groove; 402. Lead screw; 5. Sliding housing; 501. Servo motor; 502. Drive gear; 503. Driven gear; 504. Lead screw transmission pipe; 505. Bearing; 506. Guide slider; 507. Guide slide groove; 6. Support frame; 7. Screen clamp fixing component; 701. U-shaped clamping groove; 702. Electromagnet; 703. Placement groove; 704. Through hole; 8. Screen printing screen frame; 801. Screen printing screen; 802. Iron block; 9. Electro-hydraulic cylinder; 10. Clamping fixing head; 11. Auxiliary hydraulic cylinder; 12. Piston push rod; 13. Limit ball head; 14. Locking bracket; 15. Reset spring; 16. Adapter; 17. Fixing frame; 18. Hydraulic pipeline; 19. Solenoid valve; 20. Controller. Detailed Implementation

[0027] The present invention will be further explained below with reference to specific embodiments.

[0028] Example

[0029] refer to Figure 1-5This embodiment proposes a screen printing plate printing direction precision positioning mechanism, including a machine base 1 and a frame 2 fixedly installed on the top rear side of the machine base 1. A printing platform 3 is fixedly installed on the machine base 1 located in front of the frame 2. A horizontally arranged printing beam 4 is fixedly installed on the front side of the frame 2. A slide groove 401 is provided on the front side of the printing beam 4. A displacement adjustment mechanism is provided in the slide groove 401. Two sliding housings 5 ​​are movably installed in the slide groove 401 through the displacement adjustment mechanism. The front sides of the two sliding housings 5 ​​are respectively fixedly connected to screen clamp fixing members 7 through support frames 6. The two screen clamp fixing members 7 are each provided with a U-shaped clamping groove 701 for clamping the screen printing screen frame 8 on the side close to each other. A screen printing screen sheet 801 is fixedly connected to the inner bottom of the screen printing screen frame 8. A mechanical locking composite fixing mechanism is provided in the U-shaped clamping groove 701 for clamping and fixing the screen printing screen frame 8. A magnetic suction auxiliary positioning mechanism is also provided in the U-shaped clamping groove 701 for magnetic suction auxiliary positioning of the screen printing screen frame 8.

[0030] like Figure 2 , 4 In section 5, the displacement adjustment mechanism includes a lead screw 402 fixedly installed in the slide groove 401, a lead screw transmission tube 504 rotatably installed in the sliding housing 5, the lead screw transmission tube 504 being sleeved on the lead screw 402 and threadedly connected to the lead screw 402; a servo motor 501 is fixedly installed on the inner wall of the top side of the sliding housing 5 by a mounting bracket, the output shaft of the servo motor 501 is fixedly sleeved with a drive gear 502, and a driven gear 503 is fixedly sleeved on the lead screw transmission tube 504, and the drive gear 502 and the driven gear 503 are engaged in transmission.

[0031] like Figure 3 In the mechanical locking composite fixing mechanism, there is a clamping and fixing head 10 disposed in the U-shaped clamping groove 701, and the clamping and fixing head 10 is used to clamp and fix the screen printing frame 8; the top of the screen clamp fixing member 7 is fixedly installed with an electro-hydraulic cylinder 9, and the piston end of the electro-hydraulic cylinder 9 moves through the U-shaped clamping groove 701 and is fixedly connected to the clamping and fixing head 10.

[0032] like Figure 3 In the middle, the magnetic auxiliary positioning mechanism includes an embedding groove at the corner of the bottom inner wall of the U-shaped clamping groove 701, an electromagnet 702 is fixedly installed in the embedding groove, and a groove is provided at the bottom corner of the screen printing frame 8, an iron block 802 is fixedly embedded in the groove, and the electromagnet 702 and the iron block 802 are both pre-set as corresponding positioning references and are positioned and cooperated by magnetic attraction.

[0033] like Figure 3The mechanical locking composite fixing mechanism further includes two adapters 16 fixedly mounted on the side wall of the U-shaped clamping groove 701. Each adapter 16 is rotatably connected to a locking bracket 14 for locking and positioning the side of the clamping head 10. The two locking brackets 14 are arranged symmetrically at an angle. A limiting ball head 13 is also movably mounted between the two locking brackets 14. An auxiliary hydraulic cylinder 11 is also fixedly mounted on the side wall of the U-shaped clamping groove 701 through a placement groove 703. A piston push rod 12 is movably mounted on the auxiliary hydraulic cylinder 11. The other end of the piston push rod 12 is fixedly connected to the limiting ball head 13. A fixing frame 17 is fixedly mounted on the adapter 16. A reset spring 15 is provided between the fixing frame 17 and the locking bracket 14. The electro-hydraulic cylinder 9 and the auxiliary hydraulic cylinder 11 are also connected through a hydraulic pipe 18. A solenoid valve 19 is provided on the hydraulic pipe 18. A through hole 704 is provided on the inner wall of the top side of the placement groove 703. The hydraulic pipe 18 passes through the through hole 704.

[0034] like Figure 4 In the sliding housing 5, mounting holes are provided on both sides of the inner wall, and bearings 505 are fixedly installed in the mounting holes. The two ends of the lead screw transmission tube 504 are respectively rotatably installed on the two bearings 505. Guide sliders 506 are provided on the top and bottom sides of the sliding housing 5. Guide grooves 507 are provided on the top and bottom inner walls of the slide groove 401. The guide sliders 506 are slidably installed in the guide grooves 507 in the horizontal direction.

[0035] The support frame 6 has an overall L-shaped structure. The top side of the L-shaped support frame 6 is connected to the sliding housing 5, and the bottom side of the L-shaped support frame 6 is fixedly connected to the top of the mesh clamp fixing member 7. The machine base 1 is equipped with a controller 20, which is electrically connected to the servo motor 501, the electro-hydraulic cylinder 9, the auxiliary hydraulic cylinder 11, and the solenoid valve 19.

[0036] See Figure 1-5The screen printing plate precision positioning mechanism shown in the diagram utilizes a servo motor 501 in the displacement adjustment mechanism to drive the drive gear 502 to rotate and mesh with the driven gear 503, thereby driving the lead screw transmission tube 504 to rotate based on the bearing 505 on the sliding housing 5. This allows the two sliding housings 5 ​​to move closer or further apart via the lead screw transmission tube 504 along the lead screw 402. As the two sliding housings 5 ​​move, they also move closer or further apart via the support frame 6, adjusting the relative position between the two screen clamping members 7 according to the width of the screen printing frame 8. The screen printing frame 8 is then placed into the U-shaped grooves 701 of the two screen clamping members 7. Simultaneously, due to the magnetic auxiliary positioning mechanism, during the placement of the screen printing frame 8 into the U-shaped grooves 701, an electromagnet 702 is embedded at the positioning reference point at the corner of the bottom inner wall of the U-shaped groove 701. (The positioning surface is a magnetic adsorption area). An iron block 802 is embedded at the positioning reference position at the bottom corner of the screen printing frame 8. When the screen printing frame 8 approaches, the electromagnet 702 generates magnetism after being energized and magnetically attracts the iron block 802. This can achieve pre-positioning of the screen printing frame 8 and quickly find the correct direction. Then, the piston end of the electro-hydraulic cylinder 9 in the mechanical locking composite fixing mechanism is hydraulically extended, so that the clamping fixing head 10 presses and fixes the screen printing frame 8 from the top. At the same time, the piston push rod 12 on the auxiliary hydraulic cylinder 11 is hydraulically extended, which drives the limit ball head 13 to move to the right, so that the locking bracket 14 is rotated and opened outward based on the adapter 6 and the reset spring 15 is compressed. This allows the two locking brackets 14 to clamp the screen printing frame 8 from both sides after being rotated and opened, so as to prevent loosening from the side. This not only takes into account the positioning speed, but also ensures the stability of the positioning direction, and solves the problems of slow and easy deviation in manual alignment.

[0037] In summary, this invention avoids the drawbacks of existing screen printing stencils, which often rely on manual alignment or a single mechanical positioning structure, resulting in low positioning efficiency and a tendency for stencil orientation deviation. By employing magnetic-assisted positioning, the positioning speed is greatly improved. Furthermore, the use of upper and lower hydraulic locking and clamping positioning from both sides ensures more secure positioning and reduces the likelihood of deviation. This prevents loosening due to mechanical gaps or vibrations over long-term use, significantly ensuring the long-term stability of the printing direction, guaranteeing the pass rate of printed products and production efficiency. It also solves the problems of slow and easily misaligned manual alignment, and its simple structure facilitates widespread adoption.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A screen printing plate printing direction precision positioning mechanism, comprising a machine base (1) and a frame (2) fixedly disposed on the rear side of the top of the machine base (1), wherein a printing platform (3) is fixedly disposed on the machine base (1) located on the front side of the frame (2); characterized in that, A horizontally arranged printing beam (4) is fixedly installed on the front side of the frame (2). A slide groove (401) is provided on the front side of the printing beam (4). A displacement adjustment mechanism is provided in the slide groove (401). Two sliding shells (5) are movably installed in the slide groove (401) through the displacement adjustment mechanism. The front sides of the two sliding shells (5) are respectively fixedly connected to the screen clamp fixing parts (7) through the support frame (6). The two screen clamp fixing parts (7) are provided with U-shaped clamping grooves (701) for clamping the screen printing frame (8) on the side that is close to each other. A screen printing screen sheet (801) is fixedly connected to the bottom inner side of the screen printing frame (8). A mechanical locking composite fixing mechanism for clamping and fixing the screen printing frame (8) is provided in the U-shaped clamping groove (701). A magnetic suction auxiliary positioning mechanism for magnetic suction auxiliary positioning of the screen printing frame (8) is also provided in the U-shaped clamping groove (701). The displacement adjustment mechanism includes a lead screw (402) fixedly installed in the slide groove (401), a lead screw transmission tube (504) rotatably installed in the sliding housing (5), the lead screw transmission tube (504) is sleeved on the lead screw (402) and threadedly connected to the lead screw (402); a servo motor (501) is fixedly installed on the inner wall of the top side of the sliding housing (5) by a mounting bracket, the output shaft of the servo motor (501) is fixedly sleeved with a drive gear (502), and a driven gear (503) is fixedly sleeved on the lead screw transmission tube (504), and the drive gear (502) and the driven gear (503) are engaged in transmission. The mechanical locking composite fixing mechanism includes a clamping and fixing head (10) disposed in the U-shaped clamping groove (701), and the clamping and fixing head (10) is used to clamp and fix the screen printing frame (8); an electro-hydraulic cylinder (9) is fixedly installed on the top of the screen clamp fixing member (7), and the piston end of the electro-hydraulic cylinder (9) moves through the U-shaped clamping groove (701) and is fixedly connected to the clamping and fixing head (10).

2. The screen printing plate printing direction precision positioning mechanism according to claim 1, characterized in that, The magnetic suction auxiliary positioning mechanism includes an embedding groove at the corner of the inner wall of the bottom of the U-shaped clamping groove (701), an electromagnet (702) is fixedly installed in the embedding groove, and a groove is provided at the bottom corner of the screen printing frame (8), an iron block (802) is fixedly embedded in the groove, and the electromagnet (702) and the iron block (802) are both pre-set to be corresponding positioning references and are positioned and cooperated by magnetic suction.

3. The screen printing plate printing direction precision positioning mechanism according to claim 1, characterized in that, The mechanical locking composite fixing mechanism further includes two adapters (16) fixedly mounted on the side wall of the U-shaped clamping groove (701). Each adapter (16) is rotatably connected to a locking bracket (14) for locking and positioning the side of the clamping fixing head (10). The two locking brackets (14) are arranged symmetrically at an angle. A limiting ball head (13) is also movably provided between the two locking brackets (14). The side wall of the U-shaped clamping groove (701) is also fixedly installed via a placement groove (703). An auxiliary hydraulic cylinder (11) is provided, on which a piston push rod (12) is movably mounted, and the other end of the piston push rod (12) is fixedly connected to a limiting ball head (13); a fixing bracket (17) is fixedly mounted on the adapter (16), and a reset spring (15) is provided between the fixing bracket (17) and the locking bracket (14); the electro-hydraulic cylinder (9) and the auxiliary hydraulic cylinder (11) are also connected through a hydraulic pipeline (18), and a solenoid valve (19) is provided on the hydraulic pipeline (18).

4. The screen printing plate printing direction precision positioning mechanism according to claim 3, characterized in that, The placement groove (703) has a through hole (704) on the top inner wall, and the hydraulic pipe (18) passes through the through hole (704).

5. The screen printing plate printing direction precision positioning mechanism according to claim 1, characterized in that, The sliding housing (5) has mounting holes on both sides of its inner wall. Bearings (505) are fixedly installed in the mounting holes. The two ends of the lead screw transmission tube (504) are respectively rotatably installed on the two bearings (505).

6. The screen printing plate printing direction precision positioning mechanism according to claim 1, characterized in that, The sliding housing (5) is provided with guide sliders (506) on both the top and bottom sides, and guide grooves (507) are provided on both the top and bottom inner walls of the slide groove (401). The guide sliders (506) are slidably installed in the guide grooves (507) in the horizontal direction.

7. The screen printing plate printing direction precision positioning mechanism according to claim 1, characterized in that, The support frame (6) is L-shaped in general. The top side of the L-shaped support frame (6) is connected to the sliding housing (5), and the bottom side of the L-shaped support frame (6) is fixedly connected to the top of the mesh clamp fixing member (7).

8. The screen printing plate printing direction precision positioning mechanism according to claim 1, characterized in that, The machine tool (1) is equipped with a controller (20), which is electrically connected to the servo motor (501), the electro-hydraulic cylinder (9), the auxiliary hydraulic cylinder (11), and the solenoid valve (19).

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