Compact screen printing machine

Abstract

The invention discloses a compact screen printing machine which comprises a rack, a truss, a frame and a scraper device, the truss is arranged on the rack in a lifting mode through four guide assemblies, the truss can ascend and descend, the frame is arranged on the truss and surrounds the four guide assemblies, a left screen frame and a right screen frame are arranged on the frame, and the scraper device is arranged on the left screen frame and the right screen frame. The left net frame and the right net frame are respectively connected with the left and right ends of the net frame; the scraper device comprises a cross beam, two second lifting driving mechanisms, two third lifting driving mechanisms, a knife rest and a scraper, the output end of the first front-back driving mechanism is connected with two switching mechanisms, the two second lifting driving mechanisms are used for driving the cross beam to ascend and descend, and the two third lifting driving mechanisms are used for driving the knife rest and the scraper to ascend and descend. The left screen frame can be close to the two guide assemblies on the left as far as possible, the right screen frame can be close to the two guide assemblies on the right as far as possible, the clamping space of the screen frame is widened, and the screen printing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of screen printing machines, and particularly relates to an efficient compact screen printing machine. Background Art

[0002] The compact screen printing machine is smaller in width, height and overall volume than the ordinary screen printing machine, so as to reduce the space occupied by the equipment, reduce the weight and facilitate handling. However, the excessive pursuit of reducing the size and volume leads to the reduction of the size of the screen frame and the size of the workpieces that can be screen printed by the screen frame. Moreover, due to the reduction of the size and weight of some components, the structural strength and load-bearing capacity of the screen printing machine are reduced, and further the debugging and maintenance space of the equipment is reduced, which is not convenient for the assembly, debugging and maintenance of the equipment, and the screen printing efficiency is reduced. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the present invention provides a compact screen printing machine that can screen print workpieces with larger sizes and has higher efficiency.

[0004] A compact screen printing machine according to an embodiment of the present invention includes: a frame, a truss, a frame and a squeegee device. The frame is provided with a first lifting drive mechanism, four guiding components and a workbench that moves in the front-rear direction. The four guiding components are distributed in a rectangle; the truss is arranged on the frame in a lifting manner through the four guiding components. The first lifting drive mechanism is used to drive the truss to lift, and a first front-rear drive mechanism is arranged on the truss; the frame is arranged on the truss and surrounds the four guiding components. The frame is provided with a left screen frame and a right screen frame, and the left screen frame and the right screen frame are respectively used to connect the left and right ends of the screen frame; the squeegee device includes a cross beam, two second lifting drive mechanisms, two third lifting drive mechanisms, a tool rest and a squeegee. The output end of the first front-rear drive mechanism is connected with two transfer mechanisms. The first front-rear drive mechanism is used to drive the two transfer mechanisms to move in the front-rear direction. The two transfer mechanisms are respectively connected with the two ends of the cross beam through the two second lifting drive mechanisms. The two second lifting drive mechanisms are used to drive the cross beam to lift. The two ends of the cross beam are respectively connected with the two ends of the tool rest through the two third lifting drive mechanisms. The two third lifting drive mechanisms are used to drive the tool rest to lift. The squeegee is arranged on the tool rest, and the length of the squeegee extends in the left-right direction.

[0005] It has at least the following beneficial effects: The left mesh frame can be as close as possible to the two left guiding components, and the right mesh frame can be as close as possible to the two right guiding components, which broadens the clamping space of the mesh frame, enables the length and width dimensions of the mesh frame to be set larger, and enables the mesh frame to screen-print workpieces with larger dimensions. The second lifting drive mechanism drives the crossbeam to lift by a height that is the working stroke of the crossbeam, and the third lifting drive mechanism drives the squeegee to lift by a height that is the working stroke of the squeegee. The working stroke of the crossbeam and the working stroke of the squeegee are completed by different lifting drive mechanisms, reducing the idle stroke time of the squeegee lift and improving the screen-printing efficiency.

[0006] According to some embodiments of the present invention, the two transfer mechanisms include a first transfer plate, a second transfer plate, and a first fastener. The output end of the first front-back drive mechanism is connected to the first transfer plate, the second transfer plate is connected to the end of the crossbeam, the second transfer plate is provided with a first long circular hole with an axial direction in the up-down direction, the two first long circular holes are arc-shaped and have the same center of circle, the first fastener passes through the first long circular hole and connects the second transfer plate and the first transfer plate together, and the first fastener can move along the length direction of the first long circular hole so that the included angle between the tool holder and the left-right direction can be adjusted.

[0007] According to some embodiments of the present invention, the third lifting drive mechanism is arranged at the end of the crossbeam. The output end of the third lifting drive mechanism is connected with a mounting plate and a second fastener through a lifting adjustment assembly. A connecting plate is provided at the end of the tool holder, and a second long circular hole with an axial direction in the left-right direction is provided on the connecting plate. The second long circular hole is arc-shaped. The second fastener passes through the second long circular hole and connects the mounting plate and the connecting plate together. The second fastener can move along the length direction of the second long circular hole so that the included angle between the tool holder and the mesh frame can be adjusted.

[0008] According to some embodiments of the present invention, the output end of the lifting adjustment assembly is connected to the mounting plate through a pin shaft. The axial direction of the pin shaft is in the front-back direction, and the mounting plate can rotate around the pin shaft to adjust the horizontal state of the squeegee.

[0009] According to some embodiments of the present invention, an angle scale is provided on the mounting plate, and a pointer is provided on the connecting plate. The angle scale and the pointer are correspondingly arranged.

[0010] According to some embodiments of the present invention, the front end of the frame is connected to the truss through a hinge shaft. The length direction of the hinge shaft extends along the left-right direction. The rear end of the frame is connected to the truss through a frame-lifting mechanism. The frame-lifting mechanism is used to lift the frame so that the frame can swing up and down around the hinge shaft.

[0011] According to some embodiments of the present invention, the frame lifting mechanism includes a pull rod, a rotation drive mechanism, a rotating shaft, and a swing arm arranged on the rotating shaft. The rotation drive mechanism and the rotating shaft are both arranged on the truss, the rotation drive mechanism is transmission-connected to the rotating shaft, the free end of the swing arm is hinged to one end of the pull rod, and the other end of the pull rod is hinged to the rear end of the frame.

[0012] According to some embodiments of the present invention, the left net frame includes a left side plate, a longitudinal plate arranged on the left side of the left side plate and a left supporting plate connected to the lower end of the left side plate, and the longitudinal plate is provided with a fourth lifting drive mechanism and a pressure block, and the output end of the fourth lifting drive mechanism is connected to the pressure block, and the fourth lifting drive mechanism is used to drive the pressure block to press the left end of the net frame down to the right end of the left supporting plate.

[0013] According to some embodiments of the present invention, a connecting seat is provided at both the front and rear ends of the left side plate, and a clamping cylinder and a first U-shaped groove are provided on the connecting seat. The clamping cylinder is used to press the frame against the inner wall of the first U-shaped groove to connect the connecting seat and the frame together.

[0014] According to some embodiments of the present invention, a left limit member is further included, one end of which is provided with a second U-shaped groove, and the frame is provided with a protruding structure extending into the second U-shaped groove so that the left limit member is connected to the frame, and the other end of the left limit member is used to abut against the left side surface of the left net frame to limit the position of the left net frame in the left and right directions.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the embodiment of the present invention after the frame, the workbench and the scraper device are hidden; Figure 3 It is a schematic structural diagram of a scraper device, a switching mechanism and a lifting and lowering adjustment assembly according to an embodiment of the present invention; Figure 4 for Figure 3 A local enlarged schematic diagram of the middle A; Figure 5 It is a structural schematic diagram of a frame, a left net frame, a right net frame and a connecting seat according to an embodiment of the present invention; Figure Number: Net frame 1, frame 11, guide assembly 111, workbench 112, truss 12, first front and rear drive mechanism 121, frame 13, left net frame 131, left side plate 1311, longitudinal plate 1312, left support plate 1313, fourth lifting drive mechanism 1314, pressing block 1315, right net frame 132, scraper device 14, crossbeam 141, second lifting drive mechanism 142, third lifting drive mechanism 143, knife holder 144, scraper 145, adapter Mechanism 15, first adapter plate 151, second adapter plate 152, first oblong hole 1521, first fastener 153, lifting adjustment assembly 16, mounting plate 161, angle scale 1611, second fastener 162, connecting plate 17, second oblong hole 171, pointer 172, hinge shaft 18, frame lifting mechanism 19, pull rod 191, rotation drive mechanism 192, rotating shaft 193, swing arm 194, connecting seat 21, clamping cylinder 211, left limit piece 22. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0019] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0020] Reference Figure 1 The present invention discloses a compact screen printing machine, comprising: a frame 11, a truss 12 and a scraper device 14. The frame 11 is provided with a shell, a first lifting drive mechanism, four guide components 111 and a workbench 112 moving along the front and rear directions. The four guide components 111 are distributed in a rectangular shape. The four guide components 111 are arranged at the front end of the frame 11, two guide components 111 are located in front of the other two guide components 111 and are distributed left and right. The front end of the movement trajectory of the workbench 112 is located at the two left guide components 111 and the two right guide components 111. The shell is provided with a material inlet and outlet at a position corresponding to the rear end of the movement trajectory of the workbench 112.

[0021] It can be understood that a second front-back driving mechanism is provided on the frame 11. The second front-back driving mechanism includes a first motor, a driving wheel, a driven wheel, a belt and a sliding mechanism. The axial directions of the driving wheel and the driven wheel extend along the left-right direction. The driving wheel and the driven wheel are rotatably arranged on the frame 11, and the driving wheel and the driven wheel are distributed one in front of the other. The belt is wound around the driving wheel and the driven wheel. The first motor is arranged on the frame 11, and the output end of the first motor is in transmission connection with the driving wheel. The sliding mechanism includes a mutually cooperating guide rail and a guide block. The length of the guide rail extends along the front-back direction. The belt is connected to the guide block, and the guide block is connected to the workbench 112. When the first motor works, the first motor drives the driving wheel to rotate. The driving wheel drives the belt to rotate around the driving wheel and the driven wheel. The belt drives the guide block and the workbench 112 to move in the front-back direction. The second front-back driving mechanism further includes a protective cover. An avoidance hole with a length direction along the front-back direction is provided on the protective cover. The protective cover is connected to the frame 11 and covers the driving wheel, the driven wheel, the belt and the guide rail. The guide block extends out of the protective cover through the avoidance hole and is connected to the workbench 112.

[0022] A front positioning block, a rear positioning block and an electromagnet are further provided on the frame 11. The front positioning block and the electromagnet are arranged at the front end of the frame 11. When the workbench 112 abuts against the front positioning block, the front positioning block can block the workbench 112 from moving forward continuously. At this time, the workbench 112 is at the working station, and the electromagnet can firmly adsorb the workbench 112 to complete the positioning of the workbench 112. When the workbench 112 abuts against the rear positioning block, the rear positioning block can block the workbench 112 from moving backward continuously. At this time, the workbench 112 is at the loading and unloading station.

[0023] Refer to Figure 1 and Figure 2 , the truss 12 is arranged on the frame 11 in a lifting manner through four guiding components 111. The first lifting driving mechanism is used to drive the truss 12 to lift. The frame 13 is arranged on the truss 12 and surrounds the four guiding components 111. A left mesh frame 131 and a right mesh frame 132 are arranged on the frame 13. The left mesh frame 131 and the right mesh frame 132 are respectively used to connect the left and right ends of the mesh frame 1. The mesh frame 1 is at the front end of the frame 11, that is, the mesh frame 1 is above the working station.

[0024] The four guiding components 111 play a role in guiding the truss 12 to move in the up-down direction. When the first lifting driving mechanism drives the truss 12, the left mesh frame 131, the right mesh frame 132 and the mesh frame 1 to lift, the four guiding components 111 play a role in ensuring that the truss 12, the left mesh frame 131, the right mesh frame 132 and the mesh frame 1 move in the up-down direction. When the truss 12, the left mesh frame 131, the right mesh frame 132 and the mesh frame 1 descend, the mesh frame 1 can abut against the workpiece on the workbench 112. The frame 13 is arranged on the truss 12 and surrounds the four guiding components 111. The left mesh frame 131 and the right mesh frame 132 are located between the two left guiding components 111 and the two right guiding components 111. The left mesh frame 131 can be as close as possible to the two left guiding components 111, and the right mesh frame 132 can be as close as possible to the two right guiding components 111. Both the left mesh frame 131 and the right mesh frame 132 are below the truss 12, so that the distance between the left mesh frame 131 and the right mesh frame 132 can be set as large as possible, broadening the clamping space of the mesh frame 1. Furthermore, the width of the mesh frame 1 in the left-right direction can be made larger, and finally the length and width dimensions of the mesh frame 1 can be set larger, and the mesh frame 1 can be used for screen printing of workpieces with larger dimensions.

[0025] Referring to Figures 1 to 3 , the squeegee device 14 includes a cross beam 141, two second lifting drive mechanisms 142, two third lifting drive mechanisms 143, a tool holder 144 and a squeegee 145. A first front-back drive mechanism 121 is arranged on the truss 12. The output end of the first front-back drive mechanism 121 is connected with two transfer mechanisms 15. The first front-back drive mechanism 121 is used to drive the two transfer mechanisms 15 to move in the front-back direction. The two transfer mechanisms 15 are respectively connected with the two ends of the cross beam 141 through the two second lifting drive mechanisms 142. The two second lifting drive mechanisms 142 are used to drive the cross beam 141 to lift. The two ends of the cross beam 141 are respectively connected with the two ends of the tool holder 144 through the two third lifting drive mechanisms 143. The two third lifting drive mechanisms 143 are used to drive the tool holder 144 to lift. The squeegee 145 is arranged on the tool holder 144, and the length of the squeegee 145 extends in the left-right direction.

[0026] The two second lifting drive mechanisms 142 are used to drive the cross beam 141, the two third lifting drive mechanisms 143, the tool holder 144 and the squeegee 145 to lift. The height at which the second lifting drive mechanism 142 drives the cross beam 141 to lift is the working stroke of the cross beam. The two third lifting drive mechanisms 143 are used to drive the tool holder 144 and the squeegee 145 to lift. The height at which the third lifting drive mechanism 143 drives the squeegee 145 to lift is the working stroke of the squeegee. The working stroke of the cross beam and the working stroke of the squeegee are completed by different lifting drive mechanisms, reducing the empty stroke time of the squeegee 145 lifting, and reducing the stroke height of the cross beam 141 and the squeegee 145, which can improve the screen printing efficiency, reduce the stroke impact of the cross beam 141 and the squeegee 145, and further reduce the influence of the stroke impact of the cross beam 141 and the squeegee 145 on the screen printing quality of the workpiece.

[0027] The working stroke of the squeegee of a common screen printing machine is generally 70 mm or 75 mm. In fact, a working stroke of about 15 mm - 25 mm for the squeegee is sufficient. The large working stroke of the squeegee is mainly for the convenience of assembling and disassembling the screen frame 1, but this will waste the time for the squeegee 145 to reciprocate, thereby reducing the production efficiency. The working stroke of the crossbeam and the working stroke of the squeegee are completed by different lifting drive mechanisms, that is, the way of separating the working stroke of the crossbeam from the working stroke of the squeegee. The working stroke of the crossbeam is 50 mm, which is mainly used for the assembly of the screen frame 1 and the lifting of the screen frame 1 when the workpiece screen printing is completed, and is completed by the second lifting drive mechanism 142. The working stroke of the squeegee is 25 mm, which is completed by the third lifting drive mechanism 143. When the crossbeam 141 is lifted to the working position, only the third lifting drive mechanism 143 needs to be started to perform the screen printing work. After the screen printing work is completed, the crossbeam 141 can be lifted to perform the work of wiping the screen, assembling and adjusting the screen frame 1. The working stroke of the crossbeam and the working stroke of the squeegee are completed by different lifting drive mechanisms, saving the time required for the squeegee 145 to reciprocate up and down. The time saved for a single screen printing is about 5 - 10%, improving the efficiency of screen printing.

[0028] In this embodiment, the number of trusses 12 is two, and the two trusses 12 are distributed left and right. The front and rear ends of the left truss 12 are respectively connected to the frame 11 through two left guiding components 111, and the front and rear ends of the right truss 12 are respectively connected to the frame 11 through two right guiding components 111. The number of the first front and rear drive mechanisms 121 is two, and the two first front and rear drive mechanisms 121 are respectively connected to the two transfer mechanisms 15. The structure of the first front and rear drive mechanism 121 is the same as or similar to the structure of the second front and rear drive mechanism, and the specific structure and specific setting method of the first front and rear drive mechanism 121 will not be introduced redundantly here.

[0029] The number of the tool holders 144 and the squeegees 145 is two each. One second lifting drive mechanism 142 and another second lifting drive mechanism 142 are distributed left and right. One transfer mechanism 15 is connected to one end of the crossbeam 141 (the left end of the crossbeam 141) through one second lifting drive mechanism 142, and another transfer mechanism 15 is connected to the other end of the crossbeam 141 (the right end of the crossbeam 141) through another second lifting drive mechanism 142. The two second lifting drive mechanisms 142 are used to drive the crossbeam 141 to lift, so that the left and right ends of the crossbeam 141 are balanced in force.

[0030] The two squeegees 145 are arranged in parallel with each other. One squeegee 145 is an oil scraping knife, and the other squeegee 145 is an oil returning knife.

[0031] The number of the third lifting drive mechanisms 143 is four. Two of the third lifting drive mechanisms 143 and the other two third lifting drive mechanisms 143 are distributed left and right. One end of the cross beam 141 is respectively connected to one end of the tool rest 144 through two third lifting drive mechanisms 143, and the other end of the cross beam 141 is respectively connected to the other end of the tool rest 144 through the other two third lifting drive mechanisms 143. The four third lifting drive mechanisms 143 are used to drive the tool rest 144 to lift, so that the left and right ends of the tool rest 144 are balanced in force.

[0032] It can be understood that the second lifting drive mechanism 142 and the third lifting drive mechanism 143 are respectively a second air cylinder and a third air cylinder. An adapter mechanism 15 is connected to the piston rod of the second air cylinder. The cylinder block of the second air cylinder is connected to the lifting plate. The lifting plate is connected to the cylinder block of the third air cylinder. The piston rod of the third air cylinder is connected to the tool rest 144.

[0033] Referring to Figure 1 and Figure 2 , the guiding assembly 111 includes a guide post and a guide sleeve sleeved on the guide post. The guide sleeve is connected to the frame 11, and the upper end of the guide post is connected to the truss 12. The first lifting drive mechanism includes a second motor, a rotating shaft, a guide sprocket, a driving sprocket and a chain. The second motor is arranged on the frame 11. The rotating shaft is rotatably arranged on the frame 11 and is in transmission connection with the output end of the second motor. The driving sprocket is sleeved on the rotating shaft. The guide sprocket is rotatably arranged on the frame 11 and is above the driving sprocket and the lower end of the guide post. One end of the chain is wound around the driving sprocket and fixedly connected to the driving sprocket. The chain is wound around the guide sprocket, and the other end of the chain is connected to the lower end of the guide post. The second motor drives the rotating shaft to rotate, the rotating shaft drives the driving sprocket to rotate, and the driving sprocket drives the guide post to lift.

[0034] Referring to Figure 3 , in some of the embodiments, the two adapter mechanisms 15 include a first adapter plate 151, a second adapter plate 152 and a first fastener 153. The output end of the first front-back drive mechanism 121 is connected to the first adapter plate 151. The second adapter plate 152 is connected to the end of the cross beam 141. The second adapter plate 152 is provided with a first long circular hole 1521 with the axial direction being the up-down direction. The two first long circular holes 1521 are arc-shaped and have the same center of circle. The first fastener 153 passes through the first long circular hole 1521 and connects the second adapter plate 152 and the first adapter plate 151 together. The first front-back drive mechanism 121 is used to drive the first adapter plate 151, the second adapter plate 152, the cross beam 141, the second lifting drive mechanism 142, the third lifting drive mechanism 143, the tool rest 144 and the scraping knife 145 to move in the front-back direction.

[0035] The first fastener 153 can move along the length direction of the first oblong hole 1521, so that the included angle between the tool rest 144 and the left - right direction can be adjusted. That is, when the tool rest 144 moves in the front - rear direction, the tool rest 144 and the squeegee 145 are parallel to each other. The length direction of the squeegee 145 can be perpendicular to the front - rear direction, and the length direction of the tool rest 144 can form an acute angle with the front - rear direction. When the squeegee 145 scrapes the ink, it can drive part of the ink to shift in the left - right direction, so that each area of the squeegee 145 can scrape the ink, that is, each area of the screen frame 1 can be evenly coated with ink.

[0036] The first fastener 153 is a first bolt. The screw rod section of the first fastener 153 is thread - connected to the first adapter plate 151, and the end cap portion of the first fastener 153 can abut against the side wall of the first oblong hole 1521.

[0037] Refer to Figure 3 and Figure 4 In some of the embodiments, with reference to Figure 3 and Figure 4 , the third lifting drive mechanism 143 is arranged at the end of the cross - beam 141. The output end of the third lifting drive mechanism 143 is connected with a mounting plate 161 and a second fastener 162 through a lifting adjustment assembly 16. A connecting plate 17 is arranged at the end of the tool rest 144. A second oblong hole 171 with an axial direction of the left - right direction is arranged on the connecting plate 17. The second oblong hole 171 is arc - shaped. The second fastener 162 passes through the second oblong hole 171 and connects the mounting plate 161 and the connecting plate 17 together. When the second fastener 162 is tightened, the mounting plate 161 and the connecting plate 17 are connected together. The third lifting drive mechanism 143 drives the lifting adjustment assembly 16 to lift and lower. The lifting adjustment assembly 16 drives the mounting plate 161, the connecting plate 17, the tool rest 144 and the squeegee 145 to lift and lower, so that the tool rest 144 and the squeegee 145 complete the squeegee working stroke, and the lifting adjustment assembly 16 can also adjust the initial positions of the tool rest 144 and the squeegee 145, and further adjust the pressure of the squeegee 145 pressing on the screen frame 1.

[0038] Initially, after adjusting the initial positions of the tool rest 144 and the squeegee 145 through the lifting adjustment assembly 16, the third lifting drive mechanism 143 works once to move the squeegee 145 from the high position to the low position or from the low position to the high position, without repeatedly adjusting the stroke of the third lifting drive mechanism 143, so as to ensure that the squeegee 145 presses on the screen frame 1 with an appropriate force.

[0039] Refer to Figure 4, the second fastener 162 can move along the length direction of the second oblong hole 171, so that the included angle between the tool rest 144 and the screen frame 1 can be adjusted. When the second fastener 162 is loosened, the connecting plate 17, the tool rest 144 and the squeegee 145 can be driven to rotate around the left - right direction as the rotation center, so as to adjust the included angle between the plane where the squeegee 145 is located and the plane where the screen frame 1 is located, that is, to adjust the included angle between the plane where the squeegee 145 is located and the horizontal plane; when the second fastener 162 is tightened, the second fastener 162 can fixedly connect the mounting plate 161 and the connecting plate 17 together. The second fastener 162 is a second bolt.

[0040] In some of these embodiments, an angle scale 1611 is provided on the mounting plate 161, and a pointer 172 is provided on the connecting plate 17. The angle scale 1611 and the pointer 172 are correspondingly arranged. The connecting plate 17 and the pointer 172 rotate together. The inclination angle of the squeegee 145 can be directly known through the pointer 172 and the angle scale 1611.

[0041] There are no other components above the middle end of the cross - beam 141, which facilitates the passage of hands and tools above the middle end of the cross - beam 141, thus facilitating the operation of the second fastener 162, the squeegee 145 and the lifting and adjusting assembly 16.

[0042] Refer to Figure 4 , in some of these embodiments, the lifting and adjusting assembly 16 is a common component and will not be introduced redundantly here. The output end of the lifting and adjusting assembly 16 is connected to the mounting plate 161 through a pin shaft. The axial direction of the pin shaft is the front - rear direction, which enables the mounting plate 161 to rotate a certain angle around the front - rear direction as the rotation center, and further realizes the adjustment of the horizontal state of the tool rest 144 and the squeegee 145.

[0043] Refer to Figure 1 and Figure 2 , in some of these embodiments, the front end of the frame 13 is connected to the truss 12 through a hinge shaft 18. The length direction of the hinge shaft 18 extends along the left - right direction. The rear end of the frame 13 is connected to the truss 12 through a frame - lifting mechanism 19. The frame - lifting mechanism 19 is used to lift the frame 13, so that the frame 13 swings up and down around the hinge shaft 18 to complete the frame - lifting action.

[0044] In some of these embodiments, the frame - lifting mechanism 19 includes a pull rod 191, a rotary drive mechanism 192, a rotating shaft 193 and a swing arm 194 provided on the rotating shaft 193. The rotary drive mechanism 192 and the rotating shaft 193 are both arranged on the truss 12. The rotary drive mechanism 192 is in transmission connection with the rotating shaft 193. The free end of the swing arm 194 is hinged to one end of the pull rod 191, and the other end of the pull rod 191 is hinged to the rear end of the frame 13. The rotary drive mechanism 192 drives the rotating shaft 193 to rotate, the rotating shaft 193 drives the swing arm 194 to rotate, and the swing arm 194 pulls up and puts down the rear end of the frame 13 through the pull rod 191.

[0045] It is understandable that the rotating shaft 193 is rotatably arranged on the truss 12, and the length direction of the rotating shaft 193 extends along the left - right direction. The number of swing arms 194 and tie rods 191 is two each. The two swing arms 194 are distributed on the rotating shaft 193 along the left - right direction, and the two swing arms 194 are respectively connected to the left and right sides of the rear end of the frame 13 through two tie rods 191 to balance the left - right forces on the rear end of the frame 13. The rotation drive mechanism 192 can be a third motor.

[0046] Refer to Figure 5 , in some of the embodiments, the left - hand net frame 131 includes a left - hand side plate 1311, a longitudinal plate 1312 arranged to the left of the left - hand side plate 1311, and a left - hand supporting plate 1313 connected to the lower end of the left - hand side plate 1311. The left - hand side plate 1311 is used to connect with the frame 13. The left - hand side plate 1311 and the left - hand supporting plate 1313 are in an L - shape, and the right end of the left - hand supporting plate 1313 is used to support the left end of the net frame 1.

[0047] A fourth lifting drive mechanism 1314 and a pressing block 1315 are arranged on the longitudinal plate 1312. The output end of the fourth lifting drive mechanism 1314 is connected to the pressing block 1315. The fourth lifting drive mechanism 1314 is used to drive the pressing block 1315 to press the left end of the net frame 1 against the right end of the left - hand supporting plate 1313, thereby fixing the left end of the net frame 1 on the left - hand net frame 131.

[0048] The longitudinal plate 1312 is arranged to the left of the left - hand side plate 1311. The output end of the fourth lifting drive mechanism 1314 faces upward. The output end of the fourth lifting drive mechanism 1314 is connected to the upper end of the pressing block 1315 through a horizontally arranged horizontal plate. The lower end of the pressing block 1315 is used to press the net frame 1. The left - hand net frame 131 is in a flat shape, which can reduce the height of the left - hand net frame 131 and the vertical installation space of the left - hand net frame 131. The fourth lifting drive mechanism 1314 is a fourth air cylinder.

[0049] Refer to Figure 5 , in some of the embodiments, connection seats 21 are arranged at both the front and rear ends of the left - hand side plate 1311. A clamping air cylinder 211 and a first U - shaped groove are arranged on the connection seat 21. The clamping air cylinder 211 is used to press the frame 1 against the inner wall of the first U - shaped groove to connect the connection seat 21 and the frame 13 together. When the clamping air cylinder 211 works, the clamping air cylinder 211 presses the frame 1 against the inner wall of the first U - shaped groove, so that the frame 13, the connection seat 21 and the left - hand side plate 1311 are connected together. When the clamping air cylinder 211 does not work, the clamping air cylinder 211 does not press the frame 1 against the inner wall of the first U - shaped groove, and the frame 13 can move in the first U - shaped groove, so that the connection seat 21 and the frame 13 are not fixed together, and the connection seat 21 can be detached from the frame 13, or the connection seat 21 can be driven to move on the frame 13 to adjust the position of the left - hand net frame 131 on the frame 13.

[0050] The structure, function, and setting method of the right mesh frame 132 are the same as those of the right mesh frame 132, and no redundant introduction will be made here. The clamping cylinder 211 can be an ordinary first cylinder or a diaphragm clamping cylinder.

[0051] Referring to Figure 5 , in some of these embodiments, the compact screen printer further includes a left limit member 22. One end of the left limit member 22 is provided with a second U-shaped groove, and the frame 13 is provided with a convex structure extending into the second U-shaped groove, so that the left limit member 22 is connected to the frame 13. The other end of the left limit member 22 is used to abut against the left side surface of the left mesh frame 131 to limit the position of the left mesh frame 131 in the left-right direction, complete the positioning of the left mesh frame 131, and prevent the left mesh frame 131 from interfering with the guiding component 111.

[0052] A third bolt is threadedly connected to the side wall of the second U-shaped groove. The third bolt can abut against the convex structure to squeeze the convex structure and the inner wall of the second U-shaped groove together, thereby fixing the left limit member 22 to the frame 13.

[0053] Similarly, the compact screen printer further includes a right limit member. The structure, function, and setting method of the right limit member are the same as or similar to those of the left limit member 22, and no redundant introduction will be made here.

[0054] The frame 13 includes a left support plate, a rear support plate, a right support plate, and a front support plate that are sequentially connected end to end. The left support plate is on the left side of the two guiding components 111 on the left, and the right support plate is on the right side of the two guiding components 111 on the right. The convex structure is the rear support plate or the front support plate.

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0056] Of course, the present invention is not limited to the above embodiments. Those skilled in the art can make equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent variations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A compact screen printing machine, characterized in that, include: A frame (11) is provided with a first lifting drive mechanism, four guide assemblies (111), and a workbench (112) that moves in a front-rear direction, wherein the four guide assemblies (111) are distributed in a rectangular shape; A truss (12) is lifted and lowered on the frame (11) via the four guide assemblies (111); the first lifting drive mechanism is used to drive the truss (12) to lift and lower; and a first front-rear drive mechanism (121) is provided on the truss (12); A frame (13) is arranged on the truss (12) and surrounds the four guide components (111); a left net frame (131) and a right net frame (132) are arranged on the frame (13); the left net frame (131) and the right net frame (132) are respectively used to connect the left and right ends of the net frame (1); The scraper device (14) comprises a crossbeam (141), two second lifting drive mechanisms (142), two third lifting drive mechanisms (143), a knife holder (144) and a scraper (145), wherein the output end of the first front-to-back drive mechanism (121) is connected to two switching mechanisms (15), the first front-to-back drive mechanism (121) is used to drive the two switching mechanisms (15) to move in a front-to-back direction, and the two switching mechanisms (15) are respectively connected to the second lifting drive mechanisms (142) via the output end of the first front-to-back drive mechanism (121). The two second lifting drive mechanisms (142) are connected to both ends of the crossbeam (141), and are used to drive the crossbeam (141) to move up and down. The two ends of the crossbeam (141) are respectively connected to both ends of the tool holder (144) through the two third lifting drive mechanisms (143), and the two third lifting drive mechanisms (143) are used to drive the tool holder (144) to move up and down. The scraper (145) is arranged on the tool holder (144), and the length of the scraper (145) extends in the left-right direction.

2. The compact screen printing machine according to claim 1, wherein, The two adapter mechanisms (15) include a first adapter plate (151), a second adapter plate (152) and a first fastener (153); the output end of the first front-rear drive mechanism (121) is connected to the first adapter plate (151); the second adapter plate (152) is connected to the end of the crossbeam (141); the second adapter plate (152) is provided with a first oblong hole (1521) with an axial direction in the up-down direction; the two first oblong holes (1521) are arc-shaped and have the same center; the first fastener (153) passes through the first oblong hole (1521) and connects the second adapter plate (152) and the first adapter plate (151) together; the first fastener (153) can move along the length direction of the first oblong hole (1521) so that the angle between the tool holder (144) and the left-right direction can be adjusted.

3. The compact screen printer according to claim 1, characterized in that, The third lifting drive mechanism (143) is provided at the end of the cross beam (141). The output end of the third lifting drive mechanism (143) is connected with a mounting plate (161) and a second fastener (162) through a lifting adjustment assembly (16). A connecting plate (17) is provided at the end of the tool rest (144). A second long circular hole (171) with an axial direction of left and right is provided on the connecting plate (17). The second long circular hole (171) is arc-shaped. The second fastener (162) passes through the second long circular hole (171) and connects the mounting plate (161) and the connecting plate (17) together. The second fastener (162) can move along the length direction of the second long circular hole (171) so that the included angle between the tool rest (144) and the screen frame (1) can be adjusted.

4. The compact screen printer according to claim 3, characterized in that, The output end of the lifting adjustment assembly (16) is connected with the mounting plate (161) through a pin shaft. The axial direction of the pin shaft is front and back. The mounting plate (161) can rotate around the pin shaft to adjust the horizontal state of the squeegee (145).

5. The compact screen printer according to claim 4, wherein An angle scale (1611) is provided on the mounting plate (161), and a pointer (172) is provided on the connecting plate (17). The angle scale (1611) and the pointer (172) are arranged correspondingly.

6. The compact screen printer according to claim 1, characterized in that, The front end of the frame (13) is connected with the truss (12) through a hinge shaft (18). The length direction of the hinge shaft (18) extends along the left and right direction. The rear end of the frame (13) is connected with the truss (12) through a frame lifting mechanism (19). The frame lifting mechanism (19) is used to lift the frame (13) so that the frame (13) swings up and down around the hinge shaft (18).

7. The compact screen printer according to claim 6, wherein The frame lifting mechanism (19) includes a pull rod (191), a rotary drive mechanism (192), a rotating shaft (193) and a swing arm (194) arranged on the rotating shaft (193). The rotary drive mechanism (192) and the rotating shaft (193) are both arranged on the truss (12). The rotary drive mechanism (192) is in transmission connection with the rotating shaft (193). The free end of the swing arm (194) is hinged with one end of the pull rod (191). The other end of the pull rod (191) is hinged with the rear end of the frame (13).

8. The compact screen printer according to claim 1, wherein The left screen frame (131) includes a left side plate (1311), a longitudinal plate (1312) arranged on the left of the left side plate (1311) and a left supporting plate (1313) connected to the lower end of the left side plate (1311). A fourth lifting drive mechanism (1314) and a pressing block (1315) are provided on the longitudinal plate (1312). The output end of the fourth lifting drive mechanism (1314) is connected with the pressing block (1315). The fourth lifting drive mechanism (1314) is used to drive the pressing block (1315) to press the left end of the screen frame (1) on the right end of the left supporting plate (1313).

9. The compact screen printer according to claim 8, wherein, Both the front and rear ends of the left side plate (1311) are provided with connecting seats (21). The connecting seats (21) are provided with clamping cylinders (211) and first U-shaped grooves. The clamping cylinders (211) are used to press the frame (13) against the inner walls of the first U-shaped grooves, so that the connecting seats (21) and the frame (13) are connected together.

10. The compact screen printer according to claim 1, characterized in that, It further includes a left limiting member (22). One end of the left limiting member (22) is provided with a second U-shaped groove. The frame (13) is provided with a convex structure extending into the second U-shaped groove, so that the left limiting member (22) is connected to the frame (13). The other end of the left limiting member (22) is used to abut against the left side surface of the left mesh frame (131) to limit the position of the left mesh frame (131) in the left-right direction.

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