A top frame machine for balancing screen printing plates

Abstract

A top frame machine for balancing screen printing stencils is disclosed, relating to the technical field of screen printing equipment. A push plate is positioned on the upper side of a base plate and connected to the base plate via a push mechanism. A limiting plate is connected to a side plate via a drive mechanism. Several connecting springs are fixed to the lower surface of an abutment plate, embedded and fixed within cylindrical grooves on the push plate. Pressure sensors are fixed at the four corners of the upper surface of the abutment plate, and abutment rods are fixed at each of the four corners of the lower surface of the abutment plate. Abutment discs abut against the lower ends of the abutment rods, inserted into the four corners of the push plate, with the upper sides of the abutment discs inclined. The output shaft of an adjusting motor is fixedly connected to the center of the lower surface of the abutment discs, and the adjusting motor is connected to the pressure sensors via a controller. Through the linkage of the pressure sensors and the adjusting motor, the pressure at the four corners of the stencil is automatically balanced, ensuring uniform stencil tension, improving printing accuracy and stencil life, while reducing manual adjustments and making operation simple and efficient.

Description

Technical Field

[0001] This utility model relates to the field of screen printing equipment technology, specifically to a top frame machine for balancing screen printing plates. Background Technology

[0002] In screen printing, the tension balance of the screen directly affects print quality. Traditional screen tensioning methods rely heavily on manual screw adjustments or mechanical frame machines, which suffer from uneven tension, cumbersome operation, and low efficiency, easily leading to screen deformation or distorted printed patterns. While existing frame machines can improve efficiency, they generally lack automatic balancing functions, still requiring repeated manual adjustments, making it difficult to ensure uniform pressure at all four corners. Especially in high-precision printing fields (such as electronic circuits and glass decoration), even slight tension differences can cause printing defects. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings and deficiencies of the existing technology by providing a reasonably designed and easy-to-use top frame machine for balanced screen printing plates, which can effectively solve the aforementioned defects in the existing technology.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: it comprises a base plate, side plates, and abutment plates; side plates are fixed to both sides of the upper surface of the base plate, and a positioning plate is provided on the upper side of the side plate adjacent to the center of the base plate; it further comprises:

[0005] A push plate is disposed on the upper side of the base plate and is connected to the base plate through a push mechanism;

[0006] The limiting plates are two in number and are respectively disposed on the upper side of the side plates on both sides. The limiting plates are connected to the side plates through a driving mechanism.

[0007] The contact plate is disposed on the upper side of the push plate, and several connecting springs are fixed in a matrix on the lower surface of the contact plate. The connecting springs are embedded and fixed in the cylindrical grooves on the push plate.

[0008] The pressure sensor consists of four sensors, which are respectively fixed at the four corners of the upper surface of the contact plate, and each of the four corners of the lower surface of the contact plate is fixed with an abutment rod.

[0009] The contact plate consists of four plates, each corresponding to the lower end of the contact rod. The contact plates are inserted into the four corners of the push plate, and the upper side of the contact plate is inclined.

[0010] The adjustable motors consist of four motors, which are respectively embedded and fixed in the four corners of the push plate. The output shaft of the adjustable motor is fixedly connected to the center of the lower surface of the contact plate. The adjustable motor is connected to the pressure sensor through a controller.

[0011] The above technical solution involves placing the mesh frame on the positioning plate, then using a drive mechanism to move the limiting plate downwards, thus limiting the mesh frame between the limiting plate and the positioning plate. A pushing mechanism then moves the pushing plate upwards until the pressure sensors on the contact plate contact the four corners of the mesh frame. When the pressure at the four corners is uneven, the corresponding pressure sensor transmits a signal to the adjusting motor via the controller. The adjusting motor rotates the contact plate, and the tilted surface of the contact plate pushes the contact rod until the pressure on all four pressure sensors is the same, ensuring uniform pressure.

[0012] As a further improvement of this utility model, an annular slide rail is fixed on the lower surface of the contact plate, and the annular slide rail is slidably arranged in the annular groove on the push plate.

[0013] The above technical solution can increase the stability of the contact plate during rotation.

[0014] As a further improvement of this utility model, the driving mechanism includes:

[0015] The push link consists of several push links, which are grouped in pairs and connected by a shaft. The push links on the left and right are staggered. The other end of the push link is connected to the lower surface of the push plate and the strip groove on the base plate by a hinge seat.

[0016] The connecting rod consists of two rods, which are symmetrically connected to the two sides of the base plate via bearings. The two ends of the connecting rods are respectively fixedly connected to the front and rear symmetrical push rods on the lower side.

[0017] The push rod is screwed into the base plate via bearings. Both ends of the push rod are connected to the connecting rods on both sides via worm gear pairs. The middle end of the push rod is connected to a push motor via a bevel gear pair. The push motor is embedded and fixed in the base plate.

[0018] The above technical solution starts the drive motor, which drives the drive rod to rotate through the bevel gear pair. The drive rod drives the connecting rods on both sides to rotate through the worm gear pair. The connecting rod drives the lower drive link to rotate, and the lower drive link drives the upper drive link to rotate. When the drive link rotates, it can drive the push plate to move up and down.

[0019] As a further improvement of this utility model, the driving mechanism includes:

[0020] The internally threaded tubes consist of four tubes, which are symmetrically connected to the side plate in pairs via bearings. Each internally threaded tube has a screw threaded into it. The upper end of the screw passes through the upper end of the internally threaded tube and is fixed to the lower surface of the corresponding limiting plate.

[0021] There are four rotating rods, each fixed to the bottom end of the internally threaded tube. The rotating rods are screwed into the side plate through bearings, and the lower end of the rotating rods is screwed into the bottom plate through bearings.

[0022] The linkage rod consists of two rods, which are symmetrically connected to the two sides of the base plate via bearings. The two linkage rods are connected by a synchronous wheel transmission assembly, and the two ends of the linkage rods are respectively connected to the rotating rods on both sides via worm gear pairs.

[0023] The drive motor is embedded in one side of the base plate, and the output shaft of the drive motor is connected to one end of one of the linkage rods.

[0024] With the above technical solution, the drive motor is started, which drives the connected linkage rod to rotate. This linkage rod drives another linkage rod to rotate through the synchronous wheel transmission assembly. The two linkage rods drive the corresponding rotating rods to rotate through the worm gear pair. The rotating rods drive the internal threaded tube to rotate, and the internal threaded tube drives the screw to move up and down. The screw drives the limit plate to move up and down.

[0025] As a further improvement of this utility model, anti-slip pads are fixed on the lower surface of the limiting plate and the upper surface of the positioning plate, and the outer peripheral wall of the anti-slip pads is set to abut against the outer peripheral wall of the limiting plate and the positioning plate.

[0026] The above technical solution can increase the friction between the wire frame and the limiting plate and positioning plate.

[0027] As a further improvement of this utility model, a mounting plate is fixed to the side of the lower side wall of the positioning plate adjacent to the side plate, and the mounting plate is connected to the side plate by bolts.

[0028] The height of the positioning plate can be adjusted according to the thickness of the wire mesh frame using the above technical solution.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows: The top frame machine for balancing screen printing plates described in this utility model automatically balances the pressure at the four corners of the screen frame through the linkage of pressure sensor and adjusting motor, ensuring uniform screen tension, improving printing accuracy and screen life, while reducing manual adjustment, and is simple and efficient to operate. This utility model has the advantages of reasonable settings and low manufacturing cost. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 This is an exploded view of the structure of this utility model.

[0032] Figure 3This is an exploded view of the contact plate, push plate, push mechanism, and contact disc in this utility model.

[0033] Figure 4 for Figure 3 Enlarged view of section A.

[0034] Figure 5 This is an exploded view of the drive mechanism in this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Base plate; 2. Side plate; 3. Positioning plate; 4. Pushing plate; 5. Pushing mechanism; 5-1. Pushing rod; 5-2. Connecting rod; 5-3. Pushing motor; 5-4. Limiting plate; 6. Drive mechanism; 7. Internal threaded tube; 7-1. Screw; 7-2. Rotating rod; 7-3. Linkage rod; 7-4. Drive motor; 7-5. Contact plate; 8. Connecting spring; 9. Pressure sensor; 10. Contact rod; 11. Contact plate; 12. Adjusting motor; 13. Circular slide rail; 14. Anti-slip pad; 15. Mounting plate; 16. Detailed Implementation

[0037] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Example

[0038] like Figures 1-5 As shown, this embodiment includes a base plate 1, side plates 2, and a positioning plate 3. Side plates 2 are welded and fixed to both sides of the upper surface of the base plate 1. A positioning plate 3 is provided on the upper side wall of the side plate 2 adjacent to the center of the base plate 1. A mounting plate 16 is welded and fixed to the lower side wall of the positioning plate 3 adjacent to the side plate 2. The mounting plate 16 is connected to the side plate 2 by bolts, and the height of the positioning plate 3 can be adjusted according to the thickness of the mesh frame. It also includes:

[0039] Push plate 4, which is disposed on the upper side of base plate 1, and is connected to base plate 1 through push mechanism 5;

[0040] Two limiting plates 6 are respectively disposed on the upper side of the side plates 2 on both sides. The limiting plates 6 are connected to the side plates 2 through the driving mechanism 7. Anti-slip pads 15 are glued and fixed on the lower surface of the limiting plates 6 and the upper surface of the positioning plates 3. The outer peripheral wall of the anti-slip pads 15 is set to abut against the outer peripheral wall of the limiting plates 6 and the positioning plates 3, which can increase the friction between the wire frame and the limiting plates 6 and the positioning plates 3.

[0041] The contact plate 8 is disposed on the upper side of the push plate 4. Several connecting springs 9 are welded and fixed in a matrix on the lower surface of the contact plate 8. The connecting springs 9 are embedded in and welded and fixed in the cylindrical grooves on the push plate 4.

[0042] Pressure sensor 10, there are four pressure sensors 10, and they are respectively fixed at the four corners of the upper surface of the contact plate 8. The four corners of the lower surface of the contact plate 8 are all welded and fixed with contact rods 11.

[0043] The abutment discs 12 are four in number, and each abuts against the lower end of the abutment rod 11. The abutment discs 12 are inserted into the four corners of the push plate 4, and the upper side of the abutment discs 12 is inclined. An annular slide rail 14 is welded and fixed on the lower surface of the abutment disc 12. The annular slide rail 14 is slidably disposed in the annular groove on the push plate 4, which can increase the stability of the abutment disc 12 when rotating.

[0044] There are four regulating motors 13, which are respectively embedded in the four corners of the push plate 4 and fixed with bolts. The output shaft of the regulating motor 13 is fixedly connected to the center of the lower surface of the contact plate 12. The regulating motor 13 is connected to the pressure sensor 10 through the controller. Example

[0045] See Figure 1-3 As shown, based on Embodiment 1, the pushing mechanism 5 includes:

[0046] Pushing link 5-1, there are several pushing links 5-1, and they are in pairs and connected by shafts. The left and right adjacent pushing links 5-1 are staggered. The other end of the pushing link 5-1 is connected to the lower surface of the pushing plate 4 and the strip groove on the bottom plate 1 respectively through the hinge seat.

[0047] Connecting rod 5-2, there are two connecting rods 5-2, and they are symmetrically connected to the two sides of the base plate 1 by bearings. The two ends of the connecting rod 5-2 are respectively fixedly connected to the front and rear symmetrical push connecting rods 5-1 on the lower side.

[0048] The push rod 5-3 is screwed into the base plate 1 via bearings. The two ends of the push rod 5-3 are connected to the connecting rods 5-2 on both sides via worm gear pairs. The middle end of the push rod 5-3 is connected to the push motor 5-4 via a bevel gear pair. The push motor 5-4 is embedded and fixed in the base plate 1. Example

[0049] See Figure 2 , Figure 5 As shown, based on Embodiment 1, the driving mechanism 7 includes:

[0050] There are four internally threaded tubes 7-1, and they are symmetrically connected to the side plate 2 in pairs through bearings. Each internally threaded tube 7-1 has a screw 7-2 screwed into it through a thread. The upper end of the screw 7-2 passes through the upper end of the internally threaded tube 7-1 and is welded and fixed to the lower surface of the corresponding limiting plate 6.

[0051] Rotating rod 7-3, there are four rotating rods 7-3, and they are fixed one by one to the bottom end of the internal threaded tube 7-1. The rotating rod 7-3 is screwed into the side plate 2 through bearings, and the lower end of the rotating rod 7-3 is screwed into the bottom plate 1 through bearings.

[0052] Linkage rod 7-4, there are two linkage rods 7-4, which are symmetrically connected to the two sides of the base plate 1 by bearings. The two linkage rods 7-4 are connected by a synchronous wheel transmission assembly. The two ends of the linkage rod 7-4 are respectively connected to the rotating rods 7-3 on both sides by worm gear pairs.

[0053] The drive motor 7-5 is embedded in the left side of the base plate 1, and the output shaft of the drive motor 7-5 is connected to the front end of the linkage rod 7-4 on the left side.

[0054] When using this invention, the mesh frame is placed on the positioning plate 3, and then the drive motor 7-5 is started. The drive motor 7-5 drives the connected linkage rod 7-4 to rotate. This linkage rod 7-4 drives another linkage rod 7-4 to rotate through the synchronous wheel transmission assembly. The two linkage rods 7-4 respectively drive the corresponding rotating rod 7-3 to rotate through the worm gear pair. The rotating rod 7-3 drives the internal threaded tube 7-1 to rotate. The internal threaded tube 7-1 drives the screw 7-2 to move up and down. The screw 7-2 drives the limiting plate 6 to move up and down, so that the limiting plate 6 and the positioning plate 3 limit the mesh frame. Then, the push motor 5-4 is started, and the push motor 5-4 drives the push rod 5-3 to rotate through the bevel gear pair. The push rod 5-3 drives the connecting rods 5-2 on both sides to rotate through the worm gear pair. The connecting rod 5-2 drives the lower push rod 5-1 to rotate, and the lower push rod 5-1 drives the upper push rod 5-1 to rotate. When the push rod 5-1 rotates, it can drive the push plate 4 to move up and down until the pressure sensor 10 on the contact plate 8 touches the four corners of the mesh frame. When the pressure at the four corners is different, the corresponding pressure sensor 10 transmits the signal to the regulating motor 13 through the controller. The regulating motor 13 drives the contact plate 12 to rotate. The inclined surface of the contact plate 12 pushes the contact rod 11 until the pressure on the four pressure sensors 10 is the same, thus ensuring uniform pressure.

[0055] Compared with the prior art, the beneficial effects of this specific embodiment are as follows:

[0056] 1. The four corner pressure sensors 10, together with the adjusting motor 13, drive the tilting contact plate 12 to balance the force on the screen frame in real time, avoid deformation and displacement, and improve printing accuracy. It is especially suitable for high-precision screen printing operations.

[0057] 2. The linkage rod 7-4 and the worm gear control the lifting of the limit plate 6, combined with the anti-slip pad 15, adapt to different mesh frame thicknesses, ensure stable fixation, prevent sliding damage, and are easy to operate and durable;

[0058] 3. The bolt-connected positioning plate 3 is height-adjustable, and the pushing mechanism 5 adopts staggered connecting rods 5-1, which can adapt to various mesh frame specifications, improve the equipment versatility, and reduce mold change time;

[0059] 4. The contact plate 12 and the ring slide rail 14 enhance rotational stability. The worm gear and bevel gear transmission ensure self-locking and anti-fall during lifting, guaranteeing rigidity and reliability during high-speed operation.

[0060] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A top frame machine for balancing screen printing plates, comprising a base plate (1), side plates (2) and a positioning plate (3), wherein side plates (2) are fixed on both sides of the upper surface of the base plate (1), and a positioning plate (3) is provided on the upper side of one side wall of the side plate (2) adjacent to the center of the base plate (1); characterized in that: It also includes: a push plate (4), which is disposed on the upper side of the base plate (1) and is connected to the base plate (1) through a push mechanism (5); two limit plates (6), which are respectively disposed on the upper side of the side plates (2) on both sides and are connected to the side plates (2) through a drive mechanism (7); a contact plate (8), which is disposed on the upper side of the push plate (4) and has several connecting springs (9) fixed in a matrix on the lower surface of the contact plate (8), the connecting springs (9) being embedded and fixed in the cylindrical grooves on the push plate (4); and four pressure sensors (10). And they are respectively fixed at the four corners of the upper surface of the contact plate (8), and the four corners of the lower surface of the contact plate (8) are fixed with contact rods (11); contact discs (12), there are four contact discs (12), and they are respectively attached to the lower end of the contact rods (11). The contact discs (12) are inserted in the four corners of the push plate (4), and the upper side of the contact discs (12) is inclined; adjustment motors (13), there are four adjustment motors (13), and they are respectively embedded and fixed in the four corners of the push plate (4). The output shaft of the adjustment motor (13) is fixedly connected to the center of the lower surface of the contact disc (12). The adjustment motor (13) is connected to the pressure sensor (10) through the controller.

2. The top frame machine for balancing screen printing plates according to claim 1, characterized in that: An annular slide rail (14) is fixed on the lower surface of the contact plate (12), and the annular slide rail (14) is slidably disposed in the annular groove on the push plate (4).

3. The top frame machine for balancing screen printing plates according to claim 1, characterized in that: The pushing mechanism (5) includes: several pushing rods (5-1), which are arranged in pairs and connected by a shaft. The adjacent pushing rods (5-1) are staggered. The other end of the pushing rods (5-1) is connected by a hinge seat to the lower surface of the pushing plate (4) and the slot on the base plate (1); and two connecting rods (5-2), which are symmetrically connected to the base plate (1) by bearings. On both sides of the inner, the two ends of the connecting rod (5-2) are fixedly connected to the front and rear symmetrical push rods (5-1) on the lower side respectively; the push rod (5-3) is screwed into the bottom plate (1) through the bearing, and the two ends of the push rod (5-3) are connected to the connecting rods (5-2) on both sides through the worm gear pair respectively. The middle end of the push rod (5-3) is connected to the push motor (5-4) through the bevel gear pair. The push motor (5-4) is embedded and fixed in the bottom plate (1).

4. The top frame machine for balancing screen printing plates according to claim 1, characterized in that: The drive mechanism (7) includes: four internally threaded tubes (7-1), which are symmetrically connected to the side plate (2) in pairs via bearings. Each internally threaded tube (7-1) has a screw (7-2) threaded inside it. The upper end of the screw (7-2) passes through the upper end of the internally threaded tube (7-1) and is fixed to the lower surface of the corresponding limiting plate (6); and four rotating rods (7-3), which are fixed to the bottom end of the internally threaded tube (7-1) in a corresponding manner. The rotating rods (7-3) are connected to the side plate (2) via bearings. Inside, the lower end of the rotating rod (7-3) is screwed into the base plate (1) through a bearing; there are two linkage rods (7-4), which are symmetrically screwed into the two sides of the base plate (1) through bearings. The two linkage rods (7-4) are connected by a synchronous wheel transmission assembly. The two ends of the linkage rod (7-4) are respectively connected to the rotating rods (7-3) on both sides through a worm gear pair; the drive motor (7-5) is embedded in one side of the base plate (1), and the output shaft of the drive motor (7-5) is connected to one end of one of the linkage rods (7-4).

5. A top frame machine for balancing screen printing plates according to claim 1, characterized in that: Anti-slip pads (15) are fixed on the lower surface of the limiting plate (6) and the upper surface of the positioning plate (3). The outer peripheral wall of the anti-slip pads (15) is set to abut against the outer peripheral wall of the limiting plate (6) and the positioning plate (3).

6. A top frame machine for balancing screen printing plates according to claim 1, characterized in that: The positioning plate (3) has a mounting plate (16) fixed on the side of its lower side wall adjacent to the side plate (2). The mounting plate (16) is connected to the side plate (2) by bolts.

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