Transmission structure of screen printing machine

Abstract

The utility model relates to a transmission structure, in particular to a transmission structure of a screen printing machine, which is characterized in that a printing bearing roller, a screen frame part sleeve and a main transmission shaft are arranged between wallboards on two sides, a roller gear is arranged at the driving end of the printing bearing roller, carrier gears are sleeved at the driving end and the non-driving end of the printing bearing roller, and racks are arranged on two sides of the screen frame part sleeve. Transmission gears are arranged at the driving end and the non-driving end of the main transmission shaft, the transmission gears are meshed with the carrier gear, an output shaft of the second motor is connected with a second gear, and the second gear is meshed with the transmission gear at the driving end of the main transmission shaft. The second motor is arranged along the transmission gear at the driving end of the main transmission shaft in a radial moving and adjusting mode, an output shaft of the first motor is connected with a first gear, the first gear is meshed with the roller gear, the first motor is arranged along the roller gear in a radial moving and adjusting mode, and all tooth gaps can be adjusted with the central axis of the printing bearing roller as the reference.

Description

Technical Field

[0001] This utility model relates to transmission structures, and in particular to a transmission structure for a screen printing machine. Background Technology

[0002] Screen printing is a printing method that requires high precision. From a mechanical perspective, gears have a certain amount of backlash. However, in screen printing, the screen frame moves reciprocally, so the gear transmission needs to change direction in each cycle. If the backlash is large or uneven, it will lead to low printing accuracy. Therefore, it is necessary to minimize the backlash and adjust its uniformity. Utility Model Content

[0003] In view of the technical problems existing in the background art, the present invention aims to provide a transmission structure for a screen printing machine with uniform tooth gap and high printing accuracy.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: The transmission structure of this screen printing machine includes two side wall panels, wherein a printing support roller, a screen frame sleeve, and a main drive shaft are provided between the two side wall panels. The driving end of the printing support roller is provided with a roller gear. Both the driving and non-driving ends of the printing support roller are loosely fitted with bridging gears. The screen frame sleeve has racks on both sides, which mesh with the bridging gears. The racks are adjustable in height. Both the driving and non-driving ends of the main drive shaft are provided with transmission gears, which mesh with the bridging gears. The main drive shaft is adjustable in eccentric rotation. The machine also includes a first motor and a second motor. The output shaft of the second motor is connected to a second gear, which meshes with the transmission gear at the driving end of the main drive shaft. The second motor is adjustable in radial movement along the transmission gear at the driving end of the main drive shaft. The output shaft of the first motor is connected to a first gear, which meshes with the roller gear. The first motor is adjustable in radial movement along the roller gear.

[0005] In this scheme, two motors drive the printing carrier roller and the screen frame sleeve respectively. The second motor drives the screen frame sleeve through the main drive shaft and the bridge gear. The main drive shaft converts the single drive into a dual drive, which has good synchronization. The tooth gap is adjusted with the central axis of the printing carrier roller as the reference. The design is reasonable.

[0006] Preferably, the two side wall panels include a left wall panel and a right wall panel, the first motor is mounted on the left wall panel, the second motor is mounted on the right bracket, the drive end of the printing bearing roller is located on the left side, and the drive end of the main drive shaft is located on the right side.

[0007] In this design, the first and second motors are staggered to avoid mutual interference.

[0008] Preferably, the first motor is connected to a first flange, and the first flange is movable and adjustable on the left wall plate. The left wall plate is provided with a first elongated slot for the first flange to move and adjust. The extension direction of the first elongated slot is consistent with the extension direction of the line connecting the center of the first gear and the center of the roller gear.

[0009] In this scheme, the center distance between the first gear and the roller gear is changed by moving and adjusting the first flange, thereby controlling the tooth backlash.

[0010] Preferably, both the first motor and the second motor are servo motors.

[0011] In this solution, the servo motor control accuracy is high.

[0012] Preferably, the main drive shaft is provided with eccentric sleeves on both sides, and the eccentric sleeves are rotatably adjustable on the two side wall plates. The second motor is connected to a second flange, and the second flange is movably adjustable on the right wall plate. The right wall plate is provided with a second elongated slot for the second flange to move and adjust. The extension direction of the second elongated slot is consistent with the extension direction of the line connecting the center of the second gear and the center of the transmission gear at the drive end of the main drive shaft.

[0013] In this scheme, rotating the eccentric sleeve can adjust the center distance between the main drive shaft and the printing bearing roller. Based on this, moving and adjusting the second flange can change the center distance between the second gear and the transmission gear, thereby controlling the tooth backlash.

[0014] Preferably, the connection between the roller gear and the printing support roller, the connection between the output shaft of the first motor and the first gear, the connection between the main drive shaft and the transmission gear, and the connection between the output shaft of the second motor and the second gear are all expansion sleeve connections.

[0015] In this solution, the expansion sleeve connection is easy to install, has good connection stability, and has small assembly errors.

[0016] Preferably, the two side wall panels are provided with slide rails, and sliders are horizontally slidably arranged on the slide rails. The rack lifting adjustment is arranged on the sliders, and the rack is provided with a third long slot for the rack lifting adjustment.

[0017] In this design, the lifting and adjusting rack changes the center distance between the rack and the bridge gear, controls the backlash, and the slide rail and slider guide the movement of the mesh frame sleeve.

[0018] Preferably, the first motor and the second motor are located between the two side wall panels.

[0019] In this design, the first and second motors are positioned between the two side wall panels to avoid interference.

[0020] The beneficial effects of this utility model are that it transforms single-drive into dual-drive by the main drive shaft, resulting in good synchronization. With the central axis of the printing roller as a reference, all tooth gaps are adjustable, allowing for adjustment of the uniformity of the tooth gaps during installation and debugging, and maintaining a low level of tooth gap. Therefore, this utility model has substantial features and advancements compared to existing technologies. Attached Figure Description

[0021] The following description, in conjunction with the accompanying drawings, details the embodiments and working principles of this utility model.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention with the left wall panel removed.

[0024] Figure 3 This is a three-dimensional structural diagram of the first motor and the printing support roller in this utility model.

[0025] Figure 4 This is a three-dimensional structural diagram of the mesh frame, main drive shaft, and second motor in this utility model.

[0026] In the diagram: 1. Side wall panels; 2. Printing bearing roller; 3. Roller gear; 4. Bridge gear; 5. Frame sleeve; 6. Rack; 7. First motor; 8. First gear; 9. Main drive shaft; 10. Transmission gear; 11. Second motor; 12. Second gear; 13. Left wall panel; 14. Right wall panel; 15. Right bracket; 16. Slide rail; 17. Slider; 18. Eccentric sleeve; 19. Second flange. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the implementation of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0028] In the description of this application, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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 application.

[0029] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0030] See appendix Figure 1-4 The transmission structure of a screen printing machine in this embodiment includes two side wall panels 1, a first motor 7, and a second motor 11.

[0031] The two side wall panels 1 are provided with a printing support roller 2, a screen frame sleeve 5, a main drive shaft 9, and a slide rail 16. Both the first motor 7 and the second motor 11 are servo motors. The two side wall panels 1 include a left wall panel 13 and a right wall panel 14. The first motor 7 is mounted on the left wall panel 13, and the second motor 11 is mounted on the right support 15. The drive end of the printing support roller 2 is located on the left side, and the drive end of the main drive shaft 9 is located on the right side. The drive end of the printing support roller 2 is provided with a roller gear 3. Both the drive end and the non-drive end of the printing support roller 2 are loosely fitted with a bridging gear 4. The screen frame sleeve 5 has racks 6 on both sides, and the racks 6 mesh with the bridging gears 4. A slider 17 is horizontally slidably mounted on the slide rail 16. The racks 6 are adjusted for height on the slider 17. The racks 6 have a third elongated slot for height adjustment. The output shaft of the first motor 7 is connected to a first gear 8, which meshes with the roller gear 3. The first motor 7 is connected to a first... The first flange is adjustable on the left wall plate 13. The left wall plate 13 has a first elongated slot for adjusting the movement of the first flange. The extension direction of the first elongated slot is consistent with the extension direction of the line connecting the center of the first gear 8 and the center of the roller gear 3. The main drive shaft 9 has a transmission gear 10 on both the driving end and the non-driving end. The transmission gear 10 meshes with the bridge gear 4. The main drive shaft 9 has eccentric sleeves 18 on both sides. The eccentric sleeves 18 are rotatably adjustable on the two side wall plates 1. The second motor 11 is connected to the second flange. The second flange is adjustable on the right wall plate 14. The right wall plate 14 has a second elongated slot for adjusting the movement of the second flange. The extension direction of the second elongated slot is consistent with the extension direction of the line connecting the center of the second gear 12 and the center of the transmission gear 10 at the driving end of the main drive shaft 9. The output shaft of the second motor 11 is connected to the second gear 12. The second gear 12 meshes with the transmission gear 10 at the driving end of the main drive shaft 9.

[0032] In this embodiment, the output shaft of the first motor 7 drives the first gear 8 to rotate, which in turn drives the printing roller 2 to rotate via the roller gear 3. The output shaft of the second motor 11 drives the second gear 12 to rotate, which in turn drives the screen frame sleeve 5 to move via the transmission gear 10 of the main drive shaft 9, the bridge gear 4 at both ends of the printing roller 2, and the racks 6 on both sides of the screen frame sleeve 5. During adjustment, the first flange is moved and adjusted with the printing roller 2 as a reference, the main drive shaft 9 is rotated eccentrically, the second flange is moved and adjusted, and the racks 6 are moved and adjusted to complete the interaction between the first gear 8, the roller gear 3, and the transmission gear 12. The tooth backlash adjustment of the 0 and the bridge gear 4, the transmission gear 10 and the second gear 12, and the rack 6 and the bridge gear 4 is as follows: the connection between the flange and the long slot and the connection between the rack 6 and the slider 17 are all sliding positioning connections. The long slot allows the fastener to pass through. Tightening the fastener presses the flange (slider 17) and the long slot for fixation. Loosening the fastener allows the flange (slider 17) to move. The empty sleeve is a bearing set between the bridge gear 4 and the printing support roller 2. The bridge gear 4 can rotate freely and will not rotate with the printing support roller 2. The roller gear 3 and the bridge gear 4 are located on both sides of the left wall plate 13.

[0033] In other alternative embodiments, the adjustable slide rail 16 can be used to adjust the rack 6, the long slot can also be provided on the slider 17 and the flange, and the first motor 7 and the second motor 11 can be provided on the outer side of the two side wall panels 1.

[0034] Furthermore, the connections between the roller gear 3 and the printing support roller 2, the connection between the output shaft of the first motor 7 and the first gear 8, the connection between the main drive shaft 9 and the transmission gear 10, and the connection between the output shaft of the second motor 11 and the second gear 12 are all expansion sleeve connections.

[0035] In this embodiment, tightening the fasteners causes the inner and outer sleeves to undergo radial elastic deformation, thereby clamping the shaft and gear to form a firm connection. This facilitates easy installation and disassembly, allows for reuse, and only requires adjusting the tightness of the fasteners to release the pressure of the expansion sleeve, disengaging it from the shaft and gear. The load distribution on the shaft and gear is uniform. Because keyed or interference-fit connections are not required, the shear stress problems of keyed connections and the edge stress problems of interference-fit connections are avoided, improving the reliability and service life of the components. The relatively uniform load distribution and lack of stress concentration ensure high precision in the fit. The uniform clamping force of the expansion sleeve ensures the concentricity of the shaft and gear connection, reducing vibration and noise.

[0036] In other alternative implementations, the connection between the shaft and the gear can be a keyed connection or an interference fit.

[0037] The above description represents the preferred embodiment of this utility model. It should be noted that the protection scope of this utility model is not limited thereto. For those skilled in the art, various improvements, modifications, or equivalent substitutions can be made without departing from the equivalent inventive concept disclosed in this utility model, and these modifications and substitutions are also considered to be within the protection scope of this utility model.

Claims

1. A transmission structure for a screen printing machine, comprising two side wall panels (1), characterized in that: Between the two side wall panels (1) is a The printing support roller (2) has a roller gear (3) at its driving end, and the driving end and non-driving end of the printing support roller (2) are both fitted with a bridge gear (4). The mesh frame sleeve (5) has racks (6) on both sides, the racks (6) meshing with the bridge gear (4), and the racks (6) are adjustable in height; The main drive shaft (9) has a drive gear (10) on both its drive end and non-drive end. The drive gear (10) meshes with the bridge gear (4). The main drive shaft (9) is eccentrically rotated and adjusted. Also includes The first motor (7) has a first gear (8) connected to its output shaft. The first gear (8) meshes with the roller gear (3). The first motor (7) is adjusted to move radially along the roller gear (3). The second motor (11) has a second gear (12) connected to its output shaft. The second gear (12) meshes with the transmission gear (10) at the drive end of the main drive shaft (9). The second motor (11) is adjusted to move radially along the transmission gear (10) at the drive end of the main drive shaft (9).

2. The transmission structure of a screen printing machine as described in claim 1, characterized in that: The two side wall panels (1) include a left wall panel (13) and a right wall panel (14). The first motor (7) is installed on the left wall panel (13), and the second motor (11) is installed on the right bracket (15). The driving end of the printing bearing roller (2) is located on the left side, and the driving end of the main drive shaft (9) is located on the right side.

3. The transmission structure of a screen printing machine as described in claim 2, characterized in that: The first motor (7) is connected to a first flange, and the first flange is movable and adjustable on the left wall plate (13). The left wall plate (13) is provided with a first elongated slot for the first flange to move and adjust. The extension direction of the first elongated slot is perpendicular to the direction of the first flange. The line connecting the center of the first gear (8) and the center of the roller gear (3) extends in the same direction.

4. The transmission structure of a screen printing machine as described in claim 1, characterized in that: Both the first motor (7) and the second motor (11) are servo motors.

5. The transmission structure of a screen printing machine as described in claim 1, characterized in that: The main drive shaft (9) is provided with eccentric sleeves (18) on both sides. The eccentric sleeves (18) are rotatably adjustable on the two side wall plates (1). The second motor (11) is connected to a second flange. The second flange is rotatably adjustable on the right wall plate (14). The right wall plate (14) is provided with a second elongated slot for the second flange to rotatably adjust. The extension direction of the second elongated slot is perpendicular to the direction of rotation of the second flange. The line connecting the center of the second gear (12) and the center of the transmission gear (10) at the drive end of the main drive shaft (9) extends in the same direction.

6. The transmission structure of a screen printing machine as described in claim 1, characterized in that: The connection between the roller gear (3) and the printing bearing roller (2), the connection between the output shaft of the first motor (7) and the first gear (8), the connection between the main drive shaft (9) and the transmission gear (10), and the connection between the output shaft of the second motor (11) and the second gear (12) are all expansion sleeve connections.

7. The transmission structure of a screen printing machine as described in claim 1, characterized in that: The two side wall panels (1) are provided with slide rails (16), and sliders (17) are horizontally slidably arranged on the slide rails (16). The rack (6) is adjusted for lifting and lowering on the sliders (17). The rack (6) is provided with a third long slot for the rack (6) to be adjusted for lifting and lowering.

8. The transmission structure of a screen printing machine as described in claim 2, characterized in that: The first motor (7) and the second motor (11) are located between the two side wall panels (1).

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