CN210257603U

CN210257603U - Screen printing machine

Info

Publication number: CN210257603U
Application number: CN201920746381.6U
Authority: CN
Inventors: 邱耀光
Original assignee: Shenzhen Scien Jc Printing Machinery Manufacturing Co ltd
Current assignee: Shenzhen Scien Jc Printing Machinery Manufacturing Co ltd
Priority date: 2019-05-22
Filing date: 2019-05-22
Publication date: 2020-04-07
Anticipated expiration: 2029-05-22

Abstract

The utility model discloses a screen printer, this screen printer include frame, print platform and positioning mechanism, and print platform connects in the frame and is located the front side of frame, and print platform is configured to accept the stock. The positioning mechanism is arranged on the printing platform and comprises a first positioning piece and a second positioning piece, the first positioning piece is arranged on the printing platform, the first side edge of a printing stock can be positioned by the first positioning piece, the second positioning piece is movably arranged on the printing platform, the second positioning piece can be used for positioning the second side edge of the printing stock, and the second positioning piece can push the printing stock to slide on the printing platform so that the first side edge of the printing stock is abutted against the first positioning piece. The sliding direction of the second positioning member is a direction inclined in the backward direction close to the first positioning member. The screen printer has the advantages of high printing stock positioning precision, high speed and good printing quality.

Description

Screen printing machine

Technical Field

The utility model relates to a lithography apparatus technical field especially relates to a screen printing machine.

Background

Currently, with the popularization and use of screen printing, screen printers are widely used in the printing industry. The existing screen printer mainly comprises a frame, and a control system, a printing platform, a printing mechanism and the like which are arranged on the frame, wherein an operator can start and control the operation of the printer by operating the control system. The repeated overprinting is an important link of the printing process, and the overprinting precision determines the effect quality of the copying reproduction of the printed product. The commonly used three-point positioning method in screen printing is that the adjacent vertical two side edges of the printing stock are fixed by fixed positioning sheets (or blocks, columns) against the printing stock before printing, and the same printing position is unchanged for a plurality of times, so that the screen printing pattern and the printing stock pattern are superposed in a ratio of 1:1, and the pattern printing, copying and conversion are realized through ink, thereby achieving the printing purpose. Because the single-sheet printing stock has the process of placing and taking materials, the general plane lithographic printing machine is provided with a placing space before and after printing, and a printing system is lifted up to vacate the placing and taking space position for manual work or a mechanical arm to place or take out the printing stock. Generally, a person presses two side edges of a printing stock (such as paper) against blue point positioning sheets in the X-axis direction and the Y-axis direction and then uses a screen to print. The manual positioning wastes time and energy, the precision is low, and when the mechanical arm is positioned, the paper is easy to fold or bounce, so that the screen printing plate pattern and the printing stock pattern cannot be completely overlapped, the number of defective products is increased, and the printing quality is low.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a screen printer, this screen printer's stock positioning accuracy is higher, and speed is very fast, and printing quality is better.

For realizing the technical effect, the utility model discloses a technical scheme of adoption as follows:

a screen printing machine comprising: a frame; a printing platform connected to the frame and located at a front side of the frame, the printing platform configured to receive a substrate; the printing mechanism is movably arranged on the machine frame; positioning mechanism, positioning mechanism establishes on the print platform, positioning mechanism includes: the first positioning piece is arranged on the printing platform and can be used for positioning a first side edge of the printing stock; the second positioning piece is movably arranged on the printing platform, the second positioning piece can position the second side edge of the printing stock, and the second positioning piece can push the printing stock to slide on the printing platform so that the first side edge of the printing stock is abutted against the first positioning piece; the sliding direction of the second positioning piece is a direction which is close to the first positioning piece in the backward direction and inclines.

In some embodiments, the sliding direction of the second positioning element and the left-right direction of the printing platform form an included angle α, and the included angle is that 0 degrees is more than α degrees and less than or equal to 70 degrees.

In some embodiments, the number of the second positioning parts is multiple, and the second positioning parts are uniformly distributed at intervals along the left-right direction of the printing platform.

In some specific embodiments, the cross section of each second positioning element is a parallelogram, and the abutting side of each second positioning element and the second side edge of the printing stock is parallel to the left-right direction of the printing platform.

In some more specific embodiments, a connecting line of the side edges of the plurality of second positioning members abutting against the second side edge of the printing stock is parallel to the left-right direction of the printing platform.

In some embodiments, the positioning mechanism further includes a driving mechanism configured to drive the second positioning element to move relative to the printing platform, and the driving mechanism is one of a linear motor, a ball screw, and a cylinder structure.

In some embodiments, the first locator is a cylinder.

In some embodiments, the printing platform is provided with a plurality of air holes, and the air holes are suitable for being connected with a vacuum adsorption system to generate negative pressure on the printing platform to adsorb the printing stock.

In some embodiments, the screen printer further comprises: the fixed cross beam is arranged on the machine frame in a sliding mode along the vertical direction, and the printing mechanism is arranged on the fixed cross beam in a sliding mode along the left-right direction.

In some specific embodiments, the screen printer further comprises: the two clamping mechanisms are positioned on two sides of the printing mechanism and are arranged on the fixed cross beam in a sliding mode, and the clamping mechanisms are configured to clamp the printing screen.

In some embodiments, the printing platform is further provided with a warning board, a warning sensor is arranged below the warning board, and when the warning sensor monitors that external force is applied to the warning board, the printing mechanism moves towards a direction far away from the printing platform.

The screen printer of the embodiment has the following advantages:

(1) the second positioning piece is adopted to push the printing stock to move, so that the first side edge of the printing stock is abutted against the first positioning piece, the automatic positioning of the printing stock is completed, the existing process flow and operation time are fully utilized, and the process time and the environmental space occupied by the process which is usually changed by additionally arranging a mechanism are avoided.

(2) Because the second positioning piece is not in collision contact with the printing stock, the defects that in the prior art, a folded edge is formed in the positioning process, a gap is generated by bouncing, and the like are avoided, and the positioning precision of the printing stock is improved.

(3) The printing platform is not moved all the time in the printing process, so that the possibility of offset of the printing stock is reduced, and the repeated printing precision of the screen printing machine is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic structural view of a screen printing machine according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a printing platform according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of another direction of the printing platform according to the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a clamping mechanism according to an embodiment of the present invention.

Fig. 5 is a schematic structural view of a printing mechanism according to an embodiment of the present invention.

Fig. 6 is an assembly diagram of the first fixing truss and the ink covering assembly according to the embodiment of the present invention.

Fig. 7 is an assembly view of the first fixed truss and the ink scraping assembly according to the embodiment of the present invention.

Reference numerals:

1. a frame;

2. a printing platform;

21. a printing rack; 22. a printing platform; 221. air holes; 23. a first adjustment assembly; 231. an adjusting handle, 232 and an adjusting top block; 24. a first locking member; 25. a warning board;

3. fixing the cross beam;

4. a printing mechanism; 41. a first fixed truss; 42. an ink covering component; 421. covering an ink knife; 422. an ink-coated driving member; 423. an ink-covering guide post; 43. a wiping assembly; 431. a doctor blade; 432. a wiping drive member; 433. a wiping guide post;

5. a clamping mechanism; 51. a second fixed truss; 52. a clamping assembly; 521. a clamping member; 522. adjusting the screw rod; 53. a second locking member;

6. a positioning mechanism; 61. a first positioning member; 62. a second positioning member;

7. a warning sensor;

8. and a travel sensor.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present specification, it is to be understood that the terms "left", "right", "front", "back", "upper", "lower", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

A specific structure of a screen printing machine according to an embodiment of the present invention will be described below with reference to fig. 1 to 7.

As shown in fig. 1-2, a screen printing machine according to an embodiment of the present invention includes a frame 1, a printing platform 2, and a positioning mechanism 6, wherein the printing platform 2 is connected to the frame 1 and located at a front side of the frame 1, and the printing platform 2 is configured to receive a printing material. Positioning mechanism 6 is established on printing platform 2, positioning mechanism 6 includes first setting element 61 and second setting element 62, first setting element 61 is established on printing platform 2, but first setting element 61 first side of stock is fixed a position, second setting element 62 is movably established on printing platform 2, second setting element 62 can be fixed a position the second side of stock, and second setting element 62 can promote the stock and slide so that the first side butt of stock on first setting element 61 on printing platform 2. The sliding direction of the second positioning member 62 is a direction inclined in the rearward direction near the first positioning member 61.

It can be understood that, after the printing material is placed on the printing platform 2, the second side edge of the printing material abuts against the second positioning member 62, and the second positioning member 62 can push the printing material to move, so that the first side edge of the printing material abuts against the first positioning member 61, thereby completing the automatic positioning of the printing material. Therefore, accurate and automatic positioning of the printing stock is realized. The existing process flow and operation time are fully utilized without manpower and mechanical hands, the process time and the environmental space occupied by the process which is usually changed by additionally arranging a mechanism are avoided, the time and the space are saved, and the printing production efficiency is improved. In addition, in terms of precision, the driving of the second positioning piece 62 is utilized in the process of the printing stock running leaning to the position, so that elastic collision contact is avoided, the defects that in the past, a folded edge is formed in the positioning process, a gap is formed in the bouncing-off process, and the like are avoided, and the aim of accurate positioning can be achieved.

Meanwhile, since the sliding direction of the second positioning member 62 is a direction inclined in the backward direction to be close to the first positioning member 61, that is, the force applied to the printing material by the second positioning member 62 is inclined and can be decomposed into a component force in the backward direction and in the horizontal direction to be close to the first positioning member 61 (the component force is directed leftward in fig. 2). This ensures that the second positioning element 62 can move the printing material, so that the printing material can be positioned accurately. Meanwhile, since the sliding direction of the second positioning member 62 is a direction inclined to be close to the first positioning member 61 in the backward direction, that is, the moving direction of the printing stock is a direction inclined to be close to the first positioning member 61 in the backward direction (as shown in fig. 2, the moving direction of the printing stock is the left-back direction), the speed of the printing stock can be decomposed into a moving speed towards the back and a moving speed towards the left, so that the moving speed of the printing stock towards the left is reduced, the collision between the first side edge of the printing stock and the first positioning member 61 is reduced, the curling of the printing stock is well avoided, and the printing accuracy of the screen printing machine is improved.

Furthermore, the printing platform 2 is fixed on the frame 1, and the printing mechanism 4 is movably arranged on the frame 1. Therefore, the printing platform 2 is not moved all the time in the printing process, the possibility of offset of the printing stock in the moving and resetting processes of the printing platform 2 is reduced, and the repeated printing precision of the screen printing machine is improved.

According to the utility model discloses screen printer, owing to adopt second setting element 62 to promote the stock motion, make the first side butt of stock on first setting element 61, thereby the automatic positioning of stock has been accomplished, the existing process flow and the activity duration of make full use of, avoided generally to take flow time and environment space because of the mechanism adds the change technology, and do not have the collision contact between second setting element 62 and the stock, avoid forming the hem in the positioning process and bounce off in the past and produce defects such as clearance, the positioning accuracy of stock has been improved. In addition, the printing platform 2 is not moved all the time in the printing process, so that the possibility of offset of printing stocks is reduced, and the repeated printing precision of the screen printing machine is improved.

In some embodiments, as shown in fig. 2, the second positioning element 62 is a plurality of second positioning elements 62, and the plurality of second positioning elements 62 are uniformly distributed at intervals along the left-right direction of the printing platform 2. It will be appreciated that the provision of a plurality of second locating members 62 enables better location of the substrate to be achieved, thereby ensuring the printing accuracy and overprinting accuracy of the screen printing machine.

In some embodiments, as shown in fig. 2, the cross section of each second positioning member 62 is a parallelogram, and the abutting side of each second positioning member 62 with the second side edge of the printing material is parallel to the left-right direction of the printing platform 2. This ensures that the second positioning element 62 has a contact surface with the printing material, and thus ensures to some extent the pushing action of the second positioning element 62 against the printing material.

In some embodiments, the included angle between the sliding direction of the second positioning element 62 and the left-right direction of the printing platform 2 is α, which satisfies that the relationship is that 0 ° < α ° and no more than 70 °, it can be understood that, through practical operation, when the included angle α between the sliding direction of the second positioning element 62 and the left-right direction of the printing platform 2 ranges from 0 ° to 70 °, the second positioning element 62 has a good pushing effect on the printing material, so that the positioning of the printing material is better achieved, and the overprinting precision of the screen printing machine is improved.

In some embodiments, as shown in fig. 2, a line connecting the side edges of the plurality of second positioning members 62 abutting the second side edge of the printing material is parallel to the left-right direction of the printing platform 2. Therefore, the second positioning pieces 62 can be contacted with the printing stock at the same time, the pushing effect of the second positioning pieces 62 on the printing stock is guaranteed, and the positioning accuracy of the printing stock is guaranteed, so that the overprinting accuracy of the screen printing machine is improved, and the printing quality of the screen printing machine is improved.

Of course, it should be noted that the cross-sectional shape of the second positioning member 62 is not limited to a parallelogram, and may also be a circle, an ellipse or other shapes, and the specific shape of the second positioning member 62 may be selected according to actual needs.

In some alternative embodiments, the positioning mechanism 6 further includes a driving mechanism (not shown) configured to drive the second positioning member 62 to move relative to the printing platform 2, and the driving mechanism is one of a linear motor, a ball screw, and a cylinder structure. Therefore, after the printing stock is placed on the printing platform 2, the automatic positioning of the printing stock can be realized, manpower and mechanical hands are not needed, the existing process flow and operation time are fully utilized, the process occupation time and the environment space caused by the fact that the mechanism is additionally arranged and changed are avoided, time and space are saved, and the printing efficiency is improved.

In some embodiments, the first positioning member 61 is a cylinder. Therefore, when the second positioning piece 62 pushes the printed material to move, and the first side edge of the printed material is stopped against the first positioning piece 61, the acting force of the first positioning piece 61 and the printed material is reduced, so that the printed material is prevented from curling, and the printing quality of the screen printing machine is improved. Of course, in other embodiments of the present invention, the first positioning member 61 may be formed in other shapes, and is not limited to a cylinder.

In some embodiments, as shown in fig. 2, the printing platform 2 is provided with a plurality of air holes 221, and the air holes 221 are adapted to be connected with a vacuum suction system to generate negative pressure to suck the printing material on the printing platform 2. Therefore, the printing stock can be stably placed on the printing platform 2, the possibility of the printing stock shifting is reduced, and the overprinting precision and the printing quality of the screen printing machine are further improved.

In some embodiments, as shown in fig. 1, the screen printer further includes a fixed beam 3, the printing platform 2 is connected to the frame 1, the printing platform 2 is configured to receive the printing material, the fixed beam 3 is slidably disposed on the frame 1 in the up-down direction, and the printing mechanism 4 is slidably disposed on the fixed beam 3 in the left-right direction. It can be understood that in the screen printing machine of the present invention, the printing platform 2 is fixed on the frame 1, and the printing mechanism 4 and the clamping mechanism 5 for clamping the printing screen are arranged on the fixed beam 3, and the fixed beam 3 can slide on the frame 1 along the up-and-down direction. Thus, during printing, the fixed cross-beam 3 carries the printing mechanism 4 towards the printing platform 2. When the printing screen plate contacts the printing stock, the printing mechanism 4 can transfer the pattern on the printing screen plate to the printing stock. In the whole printing process, the printing stock is always positioned on the printing platform 2 and the printing platform 2 is not moved, so that the possibility of offset of the printing stock is reduced, and the overprinting precision of the screen printing machine is improved.

In some embodiments, as shown in fig. 1, the screen printing machine further comprises two clamping mechanisms 5, two clamping mechanisms 5 are located on both sides of the printing mechanism 4 and are slidably disposed on the fixed beam 3, and the clamping mechanisms 5 are configured to clamp the printing screen. It can be understood that, since the clamping mechanisms 5 are slidably provided on the fixed beam 3, the screen printing machine of the present embodiment can adjust the distance between the two clamping mechanisms 5 according to the size of the printing screen, so that the screen printing machine can be suitable for printing on printing materials with various formats.

In some embodiments, as shown in fig. 2-3, the printing platform 2 comprises a printing table 21 and a printing support 22, the printing table 21 is connected to the frame 1, the printing support 22 is slidably disposed on the printing table 21, and the printing support 22 is configured to receive the printing material. It will be appreciated that the printing platform 2 comprises a printing table 21 connected to the frame 1 and a printing table 22 slidable relative to the printing table 21, so that the printing table 22 can be finely adjusted according to actual requirements during actual printing, and the relative position of the printing material and the printing screen can be finely adjusted by adjusting the position of the printing table 22 relative to the printing table 21 during printing, thereby further improving the overprinting accuracy of the screen printing machine.

In some alternative embodiments, as shown in fig. 3, the printing platform 2 further includes a first adjusting assembly 23 and a first locking member 24, the first adjusting assembly 23 is configured to drive the printing platform 22 to slide relative to the printing platform frame 21, the first adjusting assembly 23 includes a plurality of adjusting handles 231 provided on the printing platform frame 21 and an adjusting top block 232 provided on the printing platform frame 22 and corresponding to the plurality of adjusting handles 231, the first locking member 24 is provided on the printing platform frame 21, and the first locking member 24 is configured to lock the adjusting top block 232. It can be understood that when the relative position of the printing material and the printing screen needs to be adjusted, only the adjusting handle 231 needs to be rotated, and the adjusting handle 231 can push the adjusting top block 232 to slide, so as to drive the printing platform 22 to slide relative to the printing rack 21. The adjusting mode is very simple and convenient, and the relative position of the printing stock and the printing screen plate can be conveniently adjusted in the operation process. Advantageously, the adjustment handle 231 may be provided with a scale, so that an operator may precisely adjust the adjustment according to the adjustment requirement, and further ensure the overprinting precision of the screen printing machine. Of course, in other embodiments of the present invention, the first adjusting assembly 23 may also adopt an automatic adjusting structure driven by a motor or an air cylinder, or other manual adjusting structures, which are not illustrated herein.

Meanwhile, the adjusting top block 232 can be locked by the first locking piece 24, that is, the printing platform 22 can be locked by the first locking piece 24 on the printing rack 21, so that unnecessary shaking of the printing platform 22 in the printing process of the printing mechanism 4 is avoided, and the overprinting precision of the screen printing machine is ensured. It should be added that, in the present invention, the structure of the first locking member 24 can be various, the first locking member 24 can be a locking handle, a locking nut, or a locking buckle, and the specific form of the first locking member 24 is not limited herein, and the specific structure of the first locking member 24 can be selected according to actual situations.

In some alternative embodiments, as shown in fig. 2, a warning plate 25 is further disposed on the printing platform 2, a warning sensor 7 is disposed below the warning plate 25, and when the warning sensor 7 detects that an external force is applied to the warning plate 25, the printing mechanism 4 moves in a direction away from the printing platform 2. It can be understood that, in the printing process, if warning sensor 7 monitors that external force is exerted on warning board 25, it explains that there is the foreign matter on printing platform 2, perhaps operating personnel touched warning board 25 when having pressed printing platform 2, printing mechanism 4 moves towards the direction of keeping away from printing platform 2 this moment, can enough avoid printing mechanism 4 striking foreign matter to take place to damage like this, can avoid printing mechanism 4 to injure operating personnel again.

In some embodiments, as shown in fig. 5 to 7, the printing mechanism 4 includes a first fixed truss 41, an inking unit 42, and a wiping unit 43, the first fixed truss 41 is slidably disposed on the fixed beam 3 in the left-right direction, the inking unit 42 is slidably disposed on the first fixed truss 41 in the up-down direction, the inking unit 42 can spread the printing ink uniformly on the printing screen, the wiping unit 43 is slidably disposed on the first fixed truss 41 in the up-down direction, and the wiping unit 43 can wipe the printing ink off the printing screen. Thus, during printing, the inking assembly 42 first spreads the ink evenly over the printing screen, one portion of the ink falls through the printing screen onto the substrate and the other portion of the ink does not pass through the printing screen, and then the squeegee assembly 43 squeegees off excess printing ink and applies pressure to the printing screen so that the ink passing through the printing screen is better supported on the substrate. It should be noted here that the wiping unit 43 and the inking unit 42 are not operated simultaneously, and therefore are independent of each other on the first fixed truss 41.

In some alternative embodiments, as shown in fig. 1, a plurality of stroke sensors 8 are disposed on the fixed cross beam 3, the plurality of stroke sensors 8 are divided into two groups, and the two groups of stroke sensors 8 are respectively disposed on two sides of the first fixed truss 41. Therefore, the stroke sensor 8 can better monitor the movement range of the first fixed truss 41, namely, the stroke of the ink covering assembly 42 and the ink scraping assembly 43 is better controlled, so that the ink covering assembly 42 and the ink scraping assembly 43 can be better adapted to printing materials with different sizes. Alternatively, the stroke sensor 8 may be a proximity switch, or may be another type of sensor.

In some optional embodiments, as shown in fig. 6, the ink covering assembly 42 includes an ink covering blade 421, an ink covering driving member 422, and an ink covering guiding column 423, the ink covering driving member 422 is disposed on the first fixing truss 41, the ink covering driving member 422 can drive the ink covering blade 421 to move up and down relative to the first fixing truss 41, the ink covering guiding column 423 is disposed on the first fixing truss 41 in a penetrating manner, one end of the ink covering guiding column 423 is connected to the ink covering blade 421, and the other end of the ink covering guiding column 423 is connected to the ink covering driving member 422. It can be understood that the existence of the ink covering guide column 423 can prevent the ink covering blade 421 from shifting in the up-and-down movement process, and ensure that the ink covering blade 421 can be in close contact with the printing screen, thereby ensuring the printing effect of the screen printing machine. It should be additionally noted here that, in the embodiment of the present invention, the ink covering driving member 422 may be a linear motor, a motor-driven ball screw structure, or a cylinder-driven structure, where the specific type of the ink covering driving member 422 is not limited, and the specific type of the ink covering driving member 422 may be selected according to actual needs.

In some alternative embodiments, as shown in fig. 7, the ink scraping assembly 43 includes a scraping blade 431, a scraping driving member 432, and a scraping guiding column 433, the scraping driving member 432 is disposed on the first fixed truss 41, and the scraping driving member 432 can drive the scraping blade 431 to move up and down relative to the first fixed truss 41, the scraping guiding column 433 is disposed on the first fixed truss 41, one end of the scraping guiding column 433 is connected to the scraping blade 431, and the other end of the scraping guiding column 433 is connected to the scraping driving member 432. It can be understood that the existence of the wiping guide column 433 can prevent the wiping blade 431 from shifting in the up-and-down movement process, and ensure that the wiping blade 431 can be in close contact with the printing screen, thereby ensuring the printing effect of the screen printing machine. It should be additionally noted that, in the embodiment of the present invention, the wiping driving member 432 may be a linear motor, a motor-driven ball screw structure, or a cylinder-driven structure, where the specific type of the wiping driving member 432 is not limited, and the specific type of the wiping driving member 432 may be selected according to actual needs.

In some embodiments, as shown in fig. 4, each clamping mechanism 5 includes a second fixed truss 51, a clamping assembly 52 and a second locking member 53, the second fixed truss 51 is slidably disposed on the fixed beam 3 in the left-right direction, the clamping assembly 52 is movably disposed on the second fixed truss 51 in the up-down direction, the clamping assembly 52 is configured to clamp the printing screen, the second locking member 53 is disposed on the second fixed truss 51, and the second locking member 53 can lock the second fixed truss 51 to the fixed beam 3. Therefore, the clamping assembly 52 can move up and down relative to the second fixed truss 51, so that the distance between the printing screen clamped by the clamping assembly 52 and the printing platform 2 can be finely adjusted, the acting force between the printing screen and the printing stock can be finely adjusted, and the printing effect of the screen printing machine is ensured. Meanwhile, the existence of the second locking piece 53 can ensure that the second fixed truss 51 is fixed relative to the fixed cross beam 3 in the printing process, so that the printing screen is prevented from shaking, and the printing precision of the screen printing machine is ensured. It should be added that, in the present invention, the structure of the second locking member 53 can be various, the second locking member 53 can be a locking handle, a locking nut, or a locking buckle, the specific form of the second locking member 53 is not limited herein, and the specific structure of the second locking member 53 can be selected according to actual conditions.

In some embodiments, as shown in fig. 4, the clamping assembly 52 includes a clamping member 521 and an adjusting screw 522, the clamping member 521 is provided with a clamping slot for cooperating with the printing screen, one end of the adjusting screw 522 is connected to the clamping member 521, the other end of the adjusting screw 522 is rotatably provided on the second fixed truss 51, and the adjusting screw 522 rotates to drive the clamping member 521 to move up and down relative to the second fixed truss 51. It can be understood that when the distance between the printing screen and the printing stock needs to be adjusted, the adjusting screw 522 can be adjusted to push the clamping member 521 to move up and down relative to the second fixed truss 51, and such an adjustment manner is very simple and convenient, and facilitates adjustment by an operator.

Advantageously, the adjusting screw 522 is provided with scales, so that an operator can precisely adjust the moving distance of the clamping member 521 according to actual needs, thereby better realizing precise control of the distance between the printing screen and the printing stock. Of course, in other embodiments, the adjusting mechanism of the clamping member 521 can be formed in other forms, and is not limited to the above definition.

Example (b):

the following describes a specific structure of a screen printer according to an embodiment of the present invention with reference to fig. 1 to 7.

As shown in fig. 1, the utility model discloses a screen printer includes frame 1, print platform 2, fixed cross beam 3, printing mechanism 4, fixture 5 and positioning mechanism 6, print platform 2 connects in frame 1, print platform 2 is configured to accept the stock, fixed cross beam 3 establishes in frame 1 along upper and lower direction slidable, printing mechanism 4 establishes on fixed cross beam 3 along controlling direction slidable, fixture 5 is two, two fixture 5 are located printing mechanism 4's both sides and establish on fixed cross beam 3 slidable, fixture 5 is configured to centre gripping printing screen.

As shown in fig. 2-3, the printing platform 2 includes a printing table frame 21, a printing platform 22, a first adjusting assembly 23, a first locking member 24 and a warning plate 25, the printing table frame 21 is connected to the frame 1, the printing platform 22 is slidably disposed on the printing table frame 21, the printing platform 22 is provided with a plurality of air holes 221, and the air holes 221 are suitable for being connected with a vacuum suction system to generate negative pressure suction on the printing platform 2 to suck the printing stock. The first adjusting assembly 23 is configured to drive the printing platform 22 to slide relative to the printing table 21, and the first adjusting assembly 23 includes a plurality of adjusting handles 231 provided on the printing table 21 and an adjusting top block 232 provided on the printing platform 22 and corresponding to the three adjusting handles 231. Two of the adjustment handles 231 are used to adjust the back and forth movement of the printing platform 22, and the other handle is used to adjust the left and right movement of the printing platform 22. The first locking member 24 is provided on the printing stage 21, and the first locking member 24 is configured to lock the adjustment top block 232. And a warning sensor 7 is arranged below the warning board 25, and when the warning sensor 7 monitors that external force is applied to the warning board 25, the printing mechanism 4 moves towards the direction far away from the printing platform 2.

As shown in fig. 5 to 7, the printing mechanism 4 includes a first fixed truss 41, an ink coating unit 42, and a wiping unit 43, the first fixed truss 41 is slidably disposed on the fixed beam 3 in the left-right direction, the ink coating unit 42 is slidably disposed on the first fixed truss 41 in the up-down direction, the ink coating unit 42 can spread the printing ink uniformly on the printing screen, the wiping unit 43 is slidably disposed on the first fixed truss 41 in the up-down direction, and the wiping unit 43 can wipe the printing ink off the printing screen. Four stroke sensors 8 are arranged on the fixed cross beam 3, the four stroke sensors 8 are divided into two groups, and the two groups of stroke sensors 8 are respectively positioned on two sides of the first fixed truss 41. Cover black subassembly 42 including covering ink knife 421, cover black driving piece 422 and cover black guide post 423, cover black driving piece 422 and establish on first fixed truss 41, and cover black driving piece 422 and can drive and cover black knife 421 relative first fixed truss 41 activity from top to bottom, cover black guide post 423 and wear to establish on first fixed truss 41, cover one end of black guide post 423 and cover black knife 421 and link to each other, cover the other end of black guide post 423 and cover black driving piece 422 and link to each other. The ink scraping assembly 43 comprises a scraping blade 431, a scraping driving piece 432 and a scraping guide column 433, wherein the scraping driving piece 432 is arranged on the first fixed truss 41, the scraping driving piece 432 can drive the scraping blade 431 to move up and down relative to the first fixed truss 41, the scraping guide column 433 penetrates through the first fixed truss 41, one end of the scraping guide column 433 is connected with the scraping blade 431, and the other end of the scraping guide column 433 is connected with the scraping driving piece 432.

As shown in fig. 4, each of the clamping mechanisms 5 includes a second fixed truss 51, a clamping assembly 52 and a second locking member 53, the second fixed truss 51 is slidably disposed on the fixed beam 3 along the left-right direction, the clamping assembly 52 is movably disposed on the second fixed truss 51 along the up-down direction, the clamping assembly 52 is configured to clamp the printing screen, the second locking member 53 is disposed on the second fixed truss 51, and the second locking member 53 can lock the second fixed truss 51 on the fixed beam 3. The clamping assembly 52 comprises a clamping piece 521 and an adjusting screw 522, the clamping piece 521 is provided with a clamping groove matched with the printing screen, one end of the adjusting screw 522 is connected with the clamping piece 521, the other end of the adjusting screw 522 is rotatably arranged on the second fixed truss 51, and the adjusting screw 522 can drive the clamping piece 521 to move up and down relative to the second fixed truss 51 when rotating.

As shown in fig. 2, the positioning mechanism 6 is disposed on the printing platform 222, the positioning mechanism 6 includes a first positioning member 61, a second positioning member 62 and a driving structure, the first positioning member 61 is disposed on the printing platform 222, the first positioning member 61 can position a first side edge of the printing stock, the second positioning member 62 is movably disposed on the printing platform 222, the second positioning member 62 can position a second side edge of the printing stock, and the second positioning member 62 can push the printing stock to slide on the printing platform 222 so that the first side edge of the printing stock abuts against the first positioning member 61. The sliding direction of the second positioning member 62 is a direction approaching the first positioning member 61 in the rearward direction. The number of the second positioning members 62 is five, and a plurality of the second positioning members 62 are uniformly distributed at intervals along the left-right direction of the printing platform 222. The cross section of each second positioning member 62 is a parallelogram, and the abutting side of each second positioning member 62 and the second side edge of the printing stock is parallel to the left-right direction of the printing platform 222.

In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A screen printing machine, comprising:

a frame (1);

a printing platform (2), wherein the printing platform (2) is connected to the frame (1) and is positioned at the front side of the frame (1), and the printing platform (2) is configured to receive printing stocks;

the printing mechanism (4), the said printing mechanism (4) is movably set up on the said framework (1);

positioning mechanism (6), positioning mechanism (6) are established on printing platform (2), positioning mechanism (6) include:

a first positioning member (61), wherein the first positioning member (61) is arranged on the printing platform (2), and the first positioning member (61) can be used for positioning the first side edge of the printing stock;

the second positioning piece (62) is movably arranged on the printing platform (2), the second positioning piece (62) can position the second side edge of the printing stock, and the second positioning piece (62) can push the printing stock to slide on the printing platform (2) so that the first side edge of the printing stock is abutted against the first positioning piece (61); the sliding direction of the second positioning member (62) is a direction inclined in a backward direction close to the first positioning member (61).

2. The screen printing machine of claim 1, wherein the sliding direction of the second positioning member (62) and the left-right direction of the printing platform (2) form an angle α which satisfies the relationship of 0 ° < α ° or less than 70 °.

3. The screen printing machine of claim 1, wherein the second positioning members (62) are plural, and the plural second positioning members (62) are uniformly spaced apart in the left-right direction of the printing platform (2).

4. The screen printing machine according to claim 3, wherein each second positioning member (62) is parallelogram-shaped in cross section, and the abutting side of each second positioning member (62) with the second side edge of the printing stock is parallel to the left-right direction of the printing platform (2).

5. The screen printing machine of claim 4, wherein a line connecting the side edges of the plurality of second positioning members (62) abutting the second side edge of the substrate is parallel to the left-right direction of the printing table (2).

6. The screen printing machine of claim 1, wherein the positioning mechanism (6) further comprises a drive mechanism configured to drive the second positioning member (62) to move relative to the printing table (2), the drive mechanism being one of a linear motor, a ball screw, and a pneumatic cylinder arrangement.

7. The screen printing machine according to claim 1, wherein a plurality of air holes (221) are provided on the printing platform (2), said air holes (221) being adapted to be connected to a vacuum suction system for creating a negative pressure suction on the printing platform (2) to the substrate.

8. The screen printing machine of any one of claims 1 to 7, further comprising: the printing mechanism comprises a fixed cross beam (3), wherein the fixed cross beam (3) is slidably arranged on the rack (1) along the vertical direction, and the printing mechanism (4) is slidably arranged on the fixed cross beam (3) along the left-right direction.

9. The screen printing machine of claim 8, further comprising: the two clamping mechanisms (5) are arranged, the two clamping mechanisms (5) are positioned on two sides of the printing mechanism (4) and can be arranged on the fixed cross beam (3) in a sliding mode, and the clamping mechanisms (5) are configured to clamp the printing screen.

10. The screen printing machine according to claim 1, wherein a warning plate (25) is further disposed on the printing platform (2), a warning sensor (8) is disposed below the warning plate (25), and when the warning sensor (8) monitors that an external force is applied to the warning plate (25), the printing mechanism (4) moves in a direction away from the printing platform (2).