A high-precision turntable for ink pad printing on display screen frames and a pad printing method thereof

Abstract

This invention discloses a high-precision turntable for ink pad printing on display screen bezels, comprising a turntable body with multiple printing stations arranged along its circumference. Each printing station is equipped with a platform assembly for carrying products, which can move vertically relative to the turntable body. Below each printing station is a lifting assembly for raising the platform assembly, which includes a rotatable pad printing platform. The lifting assembly includes a support plate and a driving assembly for moving the support plate vertically. A first height adjusting bolt is provided at the top of the support rod of the support plate. This invention also discloses a method for ink pad printing on display screen bezels. By setting a set of lifting assemblies below the pad printing stations of the turntable body, the product can be lifted to a certain tilt angle, ensuring effective control of the printing accuracy for each print and ensuring ink pad printing on the side bezels.

Description

Technical Field

[0001] This invention relates to a high-precision turntable for ink transfer printing on display screen bezels and a transfer printing method thereof, belonging to the field of automation equipment technology. Background Technology

[0002] Currently, the black light-shielding area at the bezel of LCD screen products is usually made of black ink. There are generally two ways to complete this process: inkjet printing and ink pad printing.

[0003] In the pad printing method, when printing large-sized products, the large rotation diameter of the turntable makes it easy for the edges of the turntable to warp, making it difficult to guarantee flatness. At the same time, in order to ensure the stability of printing accuracy, the height and flatness of each station platform need to be consistent, which is difficult to guarantee by processing, installation and debugging alone. Moreover, since the pad printing process requires the silicone head to press the product, the force on the edge of the turntable will cause the entire structure to deform, affecting the printing effect. If the deformation is severe, it will also affect other stations.

[0004] The prior application with application number 202210269095.1, entitled "A Floating Turntable Mechanism," uses a suction plate assembly that can float and rise independently. A suction plate lifting mechanism is set below the suction plate assembly. The suction plate lifting mechanism can control the suction plate assembly to rise to a certain height, making the suction plate assembly more pressure-bearing and preventing the turntable from deforming.

[0005] Although this patent uses an independent lifting mechanism to ensure that the suction plate assembly does not apply additional pressure to the turntable when under pressure, thus preventing the turntable from deforming, it is designed for the preparation of battery cells. The precision requirements for the lifting height of the suction plate assembly are not high. Moreover, its lifting mechanism is driven by a cylinder. When the suction plate assembly is under pressure, the cylinder will have a certain amount of rebound, which will cause a slight change in the lifting height of the suction plate assembly. This may not affect the preparation of battery cells, but for LCD screen products with extremely high printing precision requirements, this slight change is enough to lead to printing defects.

[0006] When pad printing is applied to the bezel of a display screen, existing printing platforms are usually set horizontally. It is difficult to completely cover the sides of the product with ink by simply squeezing and deforming the pad printing head downwards. This results in localized ink loss on the sides of the product, leading to defective products. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a high-precision turntable and its printing method for ink transfer printing on the bezel of a display screen. By setting a set of lifting components below the printing station of the turntable body, and with precise and controllable lifting height, the product can be lifted to a certain tilt angle. Combined with the corresponding printing process, the accuracy of each printing can be effectively controlled, and the ink transfer printing on the side bezel can be ensured.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0009] A high-precision turntable for pad printing ink on display screen bezels includes a turntable body with multiple printing stations arranged along its circumference. Each printing station has a platform assembly for carrying products that can move vertically relative to the turntable body. Below each printing station is a lifting assembly for raising the platform assembly. The platform assembly includes a hollow base that can move vertically relative to the turntable body, and a pad printing platform that can rotate relative to the hollow portion of the base is arranged therein. The lifting assembly includes a support plate and a drive assembly for driving the support plate to move vertically. The upper surface of the support plate is provided with a support rod for driving the pad printing platform to rotate and lift, and the top of the support rod is provided with a first height adjustment bolt.

[0010] The aforementioned high-precision turntable for ink pad printing on display screen bezels is characterized in that: multiple first linear bearing assemblies passing through the main body of the turntable are arranged below the pad printing platform, and the position and number of the support rods correspond to the first linear bearing assemblies.

[0011] The aforementioned high-precision turntable for ink pad printing on display screen bezels is characterized in that: a circular guide rail that can rotate relative to the central control section of the hollow base is provided, the pad printing platform is fixed on the circular guide rail, and a second height adjustment bolt is provided on the top of the first linear bearing assembly.

[0012] The aforementioned high-precision turntable for ink pad printing on display screen bezels is characterized in that: the lower surface of the support plate is provided with a plurality of second linear bearing assemblies and a plurality of rollers; the driving assembly includes a sliding plate disposed below the support plate and capable of horizontal movement relative to it, and a servo motor assembly for driving the sliding plate to move horizontally; the sliding plate is provided with lifting blocks corresponding to the position and number of the rollers, and the top surface of the lifting blocks contacts the rollers, and the top surface is an inclined curved surface structure.

[0013] The aforementioned high-precision turntable for ink pad printing on display screen bezels is characterized in that: the inclined curved surface structure includes a first horizontal surface, a curved surface, an inclined surface, and a second horizontal surface connected in sequence, and a limit block is also provided on the second horizontal surface.

[0014] The aforementioned high-precision turntable for ink pad printing on display screen bezels is characterized in that: a first reset spring is connected to the support plate, and a second reset spring and a buffer are provided between the pad printing platform and the turntable body.

[0015] A method for ink transfer printing on display screen bezels, characterized by comprising the following steps:

[0016] (1) According to the position of the display screen frame to be printed at different printing stations, adjust the different first height adjustment bolts of the lifting components under the corresponding printing stations to their respective set positions, and place the four products on the pad printing platform of the corresponding stage components respectively.

[0017] (2) The support plate is lifted by the servo motor assembly. During the lifting process, the first height adjustment bolt of each lifting assembly at a higher position lifts the first linear bearing assembly at the corresponding position, thereby causing the pad printing platform to rotate, so that one edge of the product to be printed at this station is in an upward tilted state. When all the first height adjustment bolts are in contact with their respective first linear bearing assemblies, the servo motor assembly continues to drive the support plate to lift, causing the entire stage assembly to rise and separate from the turntable body to the set height.

[0018] (3) Control the corresponding pad printing device of each station to press down, transfer the ink to the inclined upward side frame of the product of the corresponding station, and after the pad printing is completed, the lifting component is reset, the platform component is reset to the turntable body, and the pad printing platform is synchronously reset under the action of the second reset spring.

[0019] (4) After the turntable body rotates 90°, repeat steps (2) and (3). After the transfer printing is completed, the turntable body continues to rotate 90° until all four edges of the product are transferred and then unloaded.

[0020] The aforementioned method for ink transfer printing on the bezel of a display screen is characterized in that: before step (1), the second height adjustment bolt is adjusted to ensure that the transfer printing platform is initially in a horizontal position, and the absolute height value of the stage assembly of each processing station on the turntable body is measured. Based on the measured absolute height value of each stage assembly, the corresponding servo motor assembly drives the support plate to lift the corresponding height value when the corresponding stage assembly rotates to the top of the lifting assembly, so as to ensure that each stage assembly is lifted to the set transfer printing height.

[0021] The aforementioned method for ink transfer printing on the border of a display screen is characterized in that: in step (1), after the product is placed on the transfer printing platform, the edge of the product protrudes 1mm-2mm beyond the edge of the transfer printing platform.

[0022] The beneficial effects of this invention are:

[0023] 1. By setting the pad printing platform to a rotatable structure and adjusting the height of each support rod through the first height adjustment bolt, the pad printing platform is ensured to complete the required angle of rotation before being lifted. This ensures that after the pad printing platform is lifted, the product is tilted, making it easier for the pad printing device to complete the pad printing on the upward tilted side of the frame, thus ensuring the printing effect.

[0024] 2. First, the absolute height of each stage component is measured. Then, during printing, the servo motor component automatically compensates and adjusts the lifting height of the lifting component each time to ensure that each pad printing platform 21 of the product is lifted to the set height, so as to ensure printing accuracy.

[0025] 3. By designing the top surface of the lifting block as a structure consisting of a first horizontal surface, a curved surface, an inclined surface, and a second horizontal surface connected in sequence, the top surface, combined with rollers, drives the support plate to lift, ensuring precise control of the lifting height of the stage assembly and stability during printing. Attached Figure Description

[0026] Figure 1 This is a side view of a high-precision turntable for ink pad printing on display screen bezels according to the present invention;

[0027] Figure 2 This is a cross-sectional view of a high-precision turntable for ink pad printing on display screen bezels according to the present invention.

[0028] Figure 3 This is a front view of a lifting assembly for a high-precision turntable used for ink pad printing on display screen bezels according to the present invention.

[0029] Figure 4 This is a side view of a lifting assembly for a high-precision turntable for ink pad printing on a display screen bezel, according to the present invention.

[0030] Figure 5 This is a side view of the lifting block of a high-precision turntable for ink pad printing on the border of a display screen, according to the present invention. Implementation

[0031] The present invention will now be further described with reference to the accompanying drawings.

[0032] like Figures 1-5As shown, a high-precision turntable for ink pad printing on the bezel of a display screen includes a turntable body 10. Multiple printing stations 20 are arranged along the circumference of the turntable body 10. Each printing station 20 is equipped with a platform assembly for carrying products, which can move vertically relative to the turntable body 10. A lifting assembly 30 for raising the platform assembly is located below each printing station 20. The platform assembly includes a hollow base 22 that can move vertically relative to the turntable body 10. A pad printing platform 21 that can rotate relative to the hollow portion of the base 22 is arranged within the hollow portion of the base 22. The lifting assembly 30 includes a support plate 31 and a driving assembly for driving the support plate 31 to move vertically. A support rod 33 for driving the pad printing platform 21 to rotate and lift is arranged on the upper surface of the support plate 31. A first height adjusting bolt 331 is arranged at the top of the support rod 33.

[0033] In this embodiment, multiple first linear bearing assemblies 24 passing through the turntable body 10 are arranged below the pad printing platform 21. The positions of the support rods 33 correspond to the first linear bearing assemblies 24, and there are four of them, arranged in a rectangular pattern. According to the rotation angle requirements of the pad printing platform 21 at the corresponding printing station, the first height adjusting bolts 331 on the two support rods 33 on the same side of the support plate 31 of each set of lifting components 30 are adjusted so that the four support rods 33 present two sets of support heights with different configurations. Figure 1 and Figure 2 As shown.

[0034] During the process of lifting the lifting assembly 30 by the drive assembly, the two higher support rods 33 first contact the first linear bearing assembly 24 on the stage assembly corresponding to their positions, causing the pad printing platform 21 to rotate relative to the base 22. As the lifting assembly 30 continues to lift, after all four support rods 33 contact the first linear bearing assembly 24, the entire stage assembly is lifted to the set height, and then the pad printing equipment performs pad printing on an upwardly tilted border on the pad printing platform 21.

[0035] At this point, the border of the product to be printed is tilted upwards. During the pad printing process, the vertical downward pressure of the pad printing head can effectively cover the border, ensuring the printing effect and preventing any partial defects.

[0036] The hollow base 22 has a central control section with a rotatable annular guide rail 23. The pad printing platform 21 is fixed on the annular guide rail 23. The top of the first linear bearing assembly 24 is provided with a second height adjustment bolt 25. The support height of the pad printing platform 21 at different positions can be adjusted by the second height adjustment bolt 25 to ensure that it is in a horizontal state. This reduces the processing difficulty and assembly requirements of the pad printing platform 21, and also facilitates the control of the lifting height of the pad printing platform 21 by the drive assembly in the later stage, thereby ensuring the pad printing accuracy.

[0037] The lower surface of the support plate 31 is provided with a plurality of second linear bearing assemblies 32 and a plurality of rollers 311. The driving assembly includes a sliding plate 34 disposed below the support plate 31 and capable of horizontal movement relative to it, and a servo motor assembly 35 for driving the sliding plate 34 to move horizontally. The sliding plate 34 is provided with lifting blocks 341 corresponding to the position and number of the rollers 311, and the top surface of the lifting block 341 contacts the rollers 311, and the top surface is an inclined curved surface structure.

[0038] The servo motor assembly 35 can precisely control the movement distance of the sliding plate 34, thereby controlling the height of the lifting block 341 driving the roller 311 to lift, ensuring that the lifting height of the pad printing platform 21 is precisely controllable each time. Furthermore, based on the absolute height value of the stage assembly itself, the servo motor assembly can automatically compensate and adjust the lifting height of the lifting assembly each time, ensuring that the product is lifted to the set height each time, which is convenient for ensuring printing accuracy.

[0039] The inclined curved surface structure includes a first horizontal surface 343, a curved surface 344, an inclined surface 345, and a second horizontal surface 346 connected in sequence. This specific inclined curved surface structure ensures precise control of the stage assembly's lifting height and stability during printing. A limit block 342 is also provided on the second horizontal surface 346 to prevent the roller 311 from disengaging from the lifting block 341.

[0040] A first return spring 36 is connected to the support plate 31 to facilitate the reset of the support plate 31. A second return spring 26 and a buffer 27 are provided between the pad printing platform 21 and the turntable body 10 to facilitate the reset of the pad printing platform 21.

[0041] A pad printing method for ink on display screen bezels includes the following steps:

[0042] (1) According to the position of the display screen frame to be printed at different printing stations, adjust the different first height adjustment bolts 331 of the lifting component 30 below the corresponding printing station to their respective set positions, and place the four products on the pad printing platform 21 of the corresponding stage component respectively. The edge of the product protrudes 1mm-2mm from the edge of the pad printing platform 21 to ensure that the ink will not touch the pad printing platform 21 during the pad printing process and affect the next printing.

[0043] (2) The support plate 31 is lifted by the servo motor assembly 35. During the lifting process, the first height adjustment bolt 331 of each set of lifting components 30 at the higher position lifts the first linear bearing assembly 24 at the corresponding position, thereby driving the pad printing platform 21 to rotate, so that one edge of the product to be printed at this station is in an upward tilted state. When all the first height adjustment bolts 331 are in contact with their respective first linear bearing assemblies 24, the servo motor assembly 35 continues to drive the support plate 31 to lift, driving the entire stage assembly to rise and separate from the turntable body 10 to the set height; at this time, the four edges of the four products in different directions at the four stations are lifted into an tilted state.

[0044] (3) Control the corresponding pad printing device of each station to press down and transfer the ink to the inclined upward side frame of the product of the corresponding station. After the pad printing is completed, the lifting component 30 is reset, the platform component is reset to the turntable body 10, and the pad printing platform 21 is synchronously reset under the action of the second reset spring 26.

[0045] (4) After the turntable body 10 rotates 90°, repeat steps (2) and (3). After the transfer printing is completed, the turntable body 10 continues to rotate 90° until all four edges of the product are transferred and then unloaded.

[0046] Before step (1), the second height adjustment bolt 25 is adjusted to ensure that the pad printing platform 21 is in a horizontal position in the initial state. The absolute height value of the stage assembly of each processing station on the turntable body 10 is measured. Based on the measured absolute height value of each stage assembly, the corresponding servo motor assembly 35 drives the support plate 31 to lift the corresponding height value when the corresponding stage assembly rotates to the top of the lifting assembly 30, so as to ensure that each stage assembly is lifted to the same pad printing height. In this printing method, only the turntable body 10 drives the stage assembly to rotate, while the lifting assembly 30 and the pad printing device are fixed. Therefore, when the absolute height value of the turntable body 10 and the stage assembly changes due to factors such as processing and assembly, in order to ensure that the stage assemblies of different stations are lifted to the same height when they reach the same lifting assembly 30 (to ensure printing accuracy), the absolute height value of the stage assembly of each processing station is measured in advance, and then the servo motor assembly 35 compensates according to the measured absolute height value. This can effectively solve the aforementioned problem and reduce the processing and assembly requirements of the turntable body 10 and the stage assembly.

[0047] In summary, the present invention provides a high-precision turntable and its method for ink transfer printing on the bezel of a display screen. By setting a set of lifting components below the printing station of the turntable body, and with precise and controllable lifting height, the product can be lifted to a certain tilt angle. Combined with the corresponding printing process, the accuracy of each printing can be effectively controlled, and the ink transfer printing on the side bezel can be ensured.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision turntable for ink pad printing on display screen bezels, comprising a turntable body (10), wherein a plurality of printing stations (20) are arranged along the circumference of the turntable body (10), characterized in that: Each printing station (20) is provided with a platform assembly for carrying products, which can move up and down relative to the turntable body (10). Below each printing station (20) is a lifting assembly (30) for raising the platform assembly. The stage assembly includes a hollow base (22) that can move up and down relative to the turntable body (10), and a pad printing platform (21) that can rotate relative to the hollow part of the hollow base (22) is provided. The lifting assembly (30) includes a support plate (31) and a drive assembly for driving the support plate (31) to move up and down. The upper surface of the support plate (31) is provided with a support rod (33) for driving the pad printing platform (21) to rotate and lift. The top of the support rod (33) is provided with a first height adjustment bolt (331). Below the pad printing platform (21), there are multiple first linear bearing assemblies (24) passing through the turntable body (10), and the position and number of the support rods (33) correspond to the first linear bearing assemblies (24).

2. The high-precision turntable for ink pad printing on display screen bezels according to claim 1, characterized in that: The hollow base (22) has a central control section with a rotatable annular guide rail (23) inside. The pad printing platform (21) is fixed on the annular guide rail (23). The top of the first linear bearing assembly (24) is provided with a second height adjustment bolt (25).

3. A high-precision turntable for ink pad printing on display screen bezels according to claim 1, characterized in that: The lower surface of the support plate (31) is provided with a plurality of second linear bearing assemblies (32) and a plurality of rollers (311). The driving assembly includes a sliding plate (34) disposed below the support plate (31) and capable of horizontal movement relative to it, and a servo motor assembly (35) for driving the sliding plate (34) to move horizontally. The sliding plate (34) is provided with lifting blocks (341) corresponding to the position and number of the rollers (311), and the top surface of the lifting block (341) is in contact with the rollers (311), and the top surface is an inclined curved surface structure.

4. A high-precision turntable for ink pad printing on display screen bezels according to claim 3, characterized in that: The inclined curved surface structure includes a first horizontal surface (343), a curved surface (344), an inclined surface (345), and a second horizontal surface (346) connected in sequence. A limit block (342) is also provided on the second horizontal surface (346).

5. A high-precision turntable for ink pad printing on display screen bezels according to claim 4, characterized in that: A first return spring (36) is connected to the support plate (31), and a second return spring (26) and a buffer (27) are provided between the pad printing platform (21) and the turntable body (10).

6. A pad printing method using a high-precision turntable for ink pad printing on display screen bezels as described in any one of claims 1-5, characterized in that: Includes the following steps: (1) According to the position of the display screen frame to be printed at different printing stations, adjust the different first height adjustment bolts (331) of the lifting component (30) below the corresponding printing station to their respective set positions, and place the four products on the pad printing platform (21) of the corresponding stage component respectively. (2) The support plate (31) is lifted by the servo motor assembly (35). During the lifting process, the first height adjustment bolt (331) of each set of lifting components (30) at the higher position lifts the first linear bearing assembly (24) at the corresponding position, thereby driving the pad printing platform (21) to rotate, so that one edge of the product to be printed at this station is in an upward tilted state. When all the first height adjustment bolts (331) are in contact with their respective first linear bearing assemblies (24), the servo motor assembly (35) continues to drive the support plate (31) to lift, driving the entire stage assembly to rise and separate from the turntable body (10) to the set height. (3) Control the corresponding pad printing device of each station to press down and transfer the ink to the inclined upward side frame of the product of the corresponding station. After the pad printing is completed, the lifting component (30) is reset, the platform component is reset to the turntable body (10), and the pad printing platform (21) is synchronously reset under the action of the second reset spring (26). (4) After the turntable body (10) rotates 90°, repeat the actions of steps (2) and (3). After the transfer printing is completed, the turntable body (10) continues to rotate 90° until all four edges of the product are transferred and then unloaded.

7. The method for ink transfer printing on a display screen bezel according to claim 6, characterized in that: Before step (1), the second height adjustment bolt (25) is adjusted to ensure that the pad printing platform (21) is in a horizontal position in the initial state. The absolute height value of the stage assembly of each processing station on the turntable body (10) is measured. Based on the measured absolute height value of each stage assembly, the corresponding servo motor assembly (35) drives the support plate (31) to lift the corresponding height value when the corresponding stage assembly rotates to the top assembly (30), so as to ensure that each stage assembly is lifted to the set pad printing height.

8. The method for ink transfer printing on a display screen bezel according to claim 7, characterized in that: In step (1), after the product is placed on the pad printing platform (21), the edge of the product protrudes 1mm-2mm beyond the edge of the pad printing platform (21).

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