Stacked screen printing machine

Abstract

The present invention relates to a stacked screen printing machine, which includes a central printing mechanism for printing a carrier; the central printing mechanism has a first side and a second side on opposite sides; two positioning frames, respectively connected to the first side and the second side of the central printing mechanism; and two material carts are detachably arranged on the two positioning frames and store a plurality of the carriers. When the printing station performs a printing operation, the carrier at the top of the material cart on the first side is moved to the central printing mechanism by a first conveying mechanism for printing, a carrier lifting mechanism on the first side moves the remaining carriers of the material cart on the first side upward by one layer, and the carrier at the bottom of the material cart on the second side is moved to the bottom of the material cart on the first side by a second conveying mechanism. The present invention can complete repeated printing operations on the same printed matter in a single printing machine, effectively reducing the site cost and time cost of the printing operation.

Description

Technical Field

[0001] The present invention relates to a screen printing machine, in particular to a stacked screen printing machine. Background Art

[0002] According to the existing screen printing equipment, most of them are continuous series type, with only a small drying oven left between the printing stations. When the same screen pattern is needed to be stacked and printed on the material multiple times, the following situations will occur: (i) The number of screens corresponding to the number of stacking printing times needs to be produced. There are errors in the screen production itself. When using different screens for stacking printing, the accuracy is not easy to control. (ii) Stacking printing often occurs in the gold oil primer process for making the printing pattern base on the material surface. Water-based gold oil requires a long drying time and is not suitable for rapid drying using infrared and other heating devices. The drying oven of the existing automatic screen printing machine often cannot dry it normally. (iii) Products often consist of processes with different stacking printing times. When using the current automatic screen printing machine for production, because each printing station can basically only print once, it must move down to the oven to dry it and then print again at the next station. Because the number of printing stations required will depend on the total number of stacking printing times of each process, a large number of printing stations will be required. Therefore, how to provide a single-machine modular printing machine that can perform repeated stacking printing through single-machine printing is one of the issues that need to be solved by operators and R&D personnel in the printing industry. Summary of the invention

[0003] The object of the present invention is to provide a stacked screen printing machine which can complete repeated printing operations on the same printed matter with a single printing machine.

[0004] To achieve the above-mentioned purpose of the invention, the present invention provides a stacked screen printing machine, which includes: a central printing mechanism for printing on a carrier; the central printing mechanism has a first side and a second side on opposite sides; two positioning frames, respectively connected to the first side and the second side of the central printing mechanism; two material trolleys, respectively arranged in the two positioning frames on the first side and the second side in a movable manner; each of the material trolleys has a plurality of supporting layers arranged in an upper and lower interval, for placing a plurality of the carriers; a first conveying mechanism, movably arranged on the top of the central printing mechanism, and its two ends respectively correspond to the two uppermost supporting layers of the two material trolleys; a second conveying mechanism, movably arranged on the bottom of the central printing mechanism, and its two ends respectively correspond to the two lowermost supporting layers of the two material trolleys; and two carrier lifting mechanisms, respectively arranged in a movably movable manner. The two positioning frames are arranged to control the carriers on the material trolley located in the positioning frames to move up and down; wherein, when a printing operation is performed, the uppermost carrier on the material trolley on the first side is moved by the first conveying mechanism to the central printing mechanism for printing, and the carrier lifting mechanism located on the first side moves the remaining carriers of the material trolley on the first side up by one layer; the lowermost carrier on the material trolley on the second side is moved by the second conveying mechanism to the lowermost supporting layer of the material trolley on the first side, and the carrier lifting mechanism on the second side moves the remaining carriers of the material trolley on the second side down by one layer; after the central printing mechanism completes printing, the carrier is moved by the first conveying mechanism to the uppermost supporting layer of the material trolley on the second side, and the carriers of the two material trolleys are circulated in sequence until the printing operation of each carrier is completed.

[0005] The carrier lifting mechanism comprises a plurality of top claw groups, a plurality of top claw telescopic driving units and a plurality of top claw lifting driving units; the top claw groups are arranged on opposite sides of the material trolley, and each of the top claw groups has a plurality of top claws, respectively corresponding to the supporting layers of the material trolley; the top claw telescopic driving units are respectively connected to the top claw groups to drive the top claw groups to move toward or away from the material trolley; the top claw lifting driving units are respectively connected to the four top claw groups to drive the top claw groups to move up and down in the vertical direction.

[0006] Each of the material trolleys is provided with two detachable bracket groups on opposite sides; each of the bracket groups has a plurality of supporting plates arranged up and down and extending inward; the supporting layers are formed between the supporting plates, so that when the carriers are placed on the supporting layers, the bottoms of the carriers rest against the supporting plates.

[0007] The carrier lifting mechanism further includes two clamping units and two clamping driving units; the two clamping units are respectively arranged at the bottom of the positioning frame and correspond to the two connecting parts of the two bracket groups of the material trolley, and the two clamping driving units are movably connected to the two clamping units to drive the two clamping units to clamp the two connecting parts and move in a direction approaching or away from the material trolley, so that the two bracket groups can be separated outward from the material trolley or reset inward.

[0008] The positioning frame further includes a trolley positioning mechanism, which has two handles arranged on opposite sides of the positioning frame and can be operated to move between an open position and a closed position, so as to be operated to move from the open position to the closed position when the material trolley enters the positioning frame, thereby restricting the material trolley from leaving the positioning frame.

[0009] The positioning frame further includes a trolley lifting mechanism, which has a plurality of positioning claws and a plurality of positioning claw driving units; the positioning claws are movably arranged at the four corners of the positioning frame and correspond to the plurality of positioning holes at the bottom of the material trolley; the positioning claw driving units are movably connected to one end of the positioning claws to drive the positioning claws to extend and lift, so that when the material trolley enters the positioning frame, the positioning claws can extend into the positioning holes of the material trolley to be fixed, and rise to lift the material trolley to a predetermined height.

[0010] The first conveying mechanism described has two tracks, two transmission members, two carrier plate driving units, two hooks and two push claws; the two tracks are respectively arranged on opposite sides of the central printing mechanism, the two transmission members are respectively arranged in the two tracks, and are used to be driven by a power source to rotate along a rotation direction, the two carrier plate driving units are movably arranged on the two tracks and connected to the two transmission members, and are used to be driven by the two transmission members to move along the two tracks, the two hooks are arranged on one side of the two carrier plate driving units, and are used to hook the carrier plate at the top of the material trolley on the first side and move the carrier plate to the central printing mechanism along with the transmission member, and the two push claws are arranged on the other side of the two carrier plate driving units relative to the two hooks, and are used to push the carrier plate located at the central printing mechanism to move to the supporting layer at the top of the material trolley on the second side.

[0011] The second conveying mechanism has a conveyor belt and a conveyor belt lifting unit; the conveyor belt is driven to rotate along a rotation direction; the conveyor belt lifting unit is arranged at the bottom of the conveyor belt, and is used to drive the conveyor belt to move up and down, so that the height of the conveyor belt moves to the supporting layer corresponding to the bottom of the two material trolleys.

[0012] The present invention further comprises a drying mechanism, which is arranged on one side of the positioning frame and is used for being controlled to dry the carriers in the two material trolleys.

[0013] The central printing mechanism includes a printing seat and a printing seat lifting device; the printing seat is used to place the carrier, and the printing seat lifting device is movably connected to the printing seat to drive the printing seat to move along the Z-axis direction to control the height of the printing seat.

[0014] The present invention can complete repeated printing operations on the same printed matter in a single printing machine, effectively reducing the site cost and time cost of the printing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of a preferred embodiment of the present invention.

[0016] Figure 2 It is an exploded view of a preferred embodiment of the present invention.

[0017] Figure 3 A three-dimensional diagram of a material trolley according to a preferred embodiment of the present invention.

[0018] Figure 4 It is a partial three-dimensional schematic diagram of the material trolley after the carrier plate is removed from the preferred embodiment of the present invention.

[0019] Figure 5 for Figure 3 A partial enlarged view of .

[0020] Figure 6 It is a three-dimensional schematic diagram of the trolley positioning mechanism of a preferred embodiment of the present invention.

[0021] Figure 7 It is a three-dimensional schematic diagram of the trolley lifting mechanism of a preferred embodiment of the present invention.

[0022] Figure 8 It is a three-dimensional schematic diagram of a carrier lifting mechanism according to a preferred embodiment of the present invention.

[0023] Fig. 9 It is a three-dimensional schematic diagram of the first conveying mechanism of a preferred embodiment of the present invention.

[0024] Fig.10 FIG. 4 is a schematic diagram of the operation of a preferred embodiment of the present invention, showing the path of the cyclic movement of the carrier.

[0025] Figures 11 to 17 It is a schematic diagram of the action of a preferred embodiment of the present invention, showing the process of the carrier lifting mechanism controlling the rising of the carrier in the material trolley.

[0026] Explanation of symbols:

[0027] (1) Stacked screen printing machine (10) Central printing mechanism (11) Printing seat (12) Printing positioning area (13) Printing seat lifting device (20) Positioning frame (21) Frame (22) Accommodating space (23) Entrance and exit (24) Carriage limiting mechanism (240) Handle (25) Carriage lifting mechanism (250) Positioning claw (250a) Inclined surface (251) Positioning claw drive unit (26) Installation groove

[0028] (27) ventilation hole (30) material trolley (31) trolley body (310) moving wheel (311) positioning hole (311a) bearing (32) bracket group (320) bracket body (321) supporting plate (322) connecting part (33) supporting layer (40) carrier lifting mechanism (41) top claw group (410) top claw (42) top claw telescopic driving unit (43) top claw lifting driving unit (44) clamping claw unit (45) clamping claw driving unit (50) first conveying mechanism (51) track (52) transmission member (53) carrier driving unit (54) hook claw (55) push claw (60) second conveying mechanism (61) conveyor belt (62) conveyor belt lifting unit (70) drying mechanism (100) carrier DETAILED DESCRIPTION

[0029] The following descriptions with reference to the drawings are preferred embodiments of the present invention. It should be understood that the drawings and descriptions are for illustrative purposes only and are not intended to limit the present invention. In addition, the terms "upper" and "lower", "left" and "right", "front" and "back", "first" and "second" described in the specification are used to clearly explain the relative positions between components or mechanisms, and are not intended to be limiting terms.

[0030] See also Figures 1 to 9 As shown, a stacked screen printing machine (1) provided by a preferred embodiment of the present invention is used to provide a single-machine modular printing device, which can complete the stacked printing operation of multiple carriers in a single printing station. The so-called stacked printing operation here refers to the repeated stacking printing of the same printed matter by flat screen printing. The stacked screen printing machine (1) mainly includes a central printing mechanism (10), two positioning frames (20), two material trolleys (30), two carrier lifting mechanisms (40), a first conveying mechanism (50), a second conveying mechanism (60) and a plurality of drying mechanisms (70). Among them:

[0031] The central printing mechanism (10) includes a printing seat (11) and a printing positioning area (12). The printing seat (11) is used to drive a scraper group to move back and forth above the screen to print. The printing positioning area (12) is used to provide a support platform for printing and can locate the position of the carrier on the printing seat (11) in the X-axis and Y-axis directions. The printing-related technology of the central printing mechanism (10) is similar to that of large-area printing machines on the market, and its details are not repeated here. It is particularly important to mention that the central printing mechanism (10) of the present invention further includes a printing seat lifting device (13) that is movably connected to the printing seat (11) to drive the printing seat (11) to move along the Z-axis direction to control the height of the printing seat (11). In this embodiment, the printing seat lifting device (13) is controlled by a servo motor. The user can set the printing plate height to be gradually increased during cyclic printing, and the distance between the screen surface and the material surface is continuously maintained when the base thickness gradually increases. The central printing mechanism (10) has a first side and a second side on two opposite sides.

[0032] The two positioning frames (20) are respectively arranged on the first side and the second side of the central printing mechanism (10). Each positioning frame (20) has a frame (21), a containing space (22) and an entrance (23). The frame (21) is a metal composite component, one end of which is connected to the central printing mechanism (10). The containing space (22) is arranged inside the frame (21). The entrance (23) is arranged on one side of the positioning frame (20) away from the central printing mechanism (10) and is connected to the containing space (22).

[0033] The two material trolleys (30) are a mobile carrier, which is detachably arranged in the accommodation space (22) of the two positioning frames (20), and can be driven by manpower or automatically controlled to enter or leave the two positioning frames (20) from the entrance (23) of the positioning frames (20). Specifically, the material trolley (30) has a trolley body (31), two bracket groups (32) and a plurality of supporting layers (33). The bottom side of the trolley body (31) is provided with a plurality of moving wheels (310) and a plurality of positioning holes (311) arranged above the moving wheels (310). The two bracket groups (32) are detachably arranged on two opposite sides of the trolley body (31), and each of the bracket groups (32) has a bracket body (320), a plurality of supporting sheets (321) and a connecting portion (322). The bracket body (320) is a metal frame that is roughly U-shaped. The supporting pieces (321) are arranged side by side on the bracket body (320), and the supporting pieces (321) of the two bracket groups (32) correspond to each other. The connecting portion (322) is arranged on the central bottom side of the bracket body (320) and extends in a direction away from the material trolley (30). The supporting layers (33) are formed between the supporting pieces (321) and are used to accommodate a plurality of carriers (100). When the carriers (100) are accommodated in the supporting layers (33), the bottoms of the carriers (100) are against the supporting pieces (321). In this embodiment, the user places or sticks the material to be printed on the carrier (100) in advance, and then places the carrier (100) into the material trolley (30). The bracket sets (32) are usually fixed by a tension spring (not shown) so that the bracket sets (32) cannot be moved.

[0034] The positioning frame (20) further includes a trolley limiting mechanism (24) and a trolley lifting mechanism (25). The trolley limiting mechanism (24) has two handles (240) which are arranged on two opposite sides of the frame (21) of the positioning frame (20) and can be operated to move between an open position and a closed position. The two handles (240) are used to move from the open position to the closed position when the material trolley (30) enters the positioning frame (20) to block the entrance (23) of the positioning frame (20), so that the material trolley (30) is fixed in the positioning frame (20) and cannot leave the positioning frame (20). In this embodiment, the two handles (240) are two manual handles.

[0035] The trolley lifting mechanism (25) is arranged at the bottom of the positioning frame (20), and has a plurality of positioning claws (250) and a plurality of positioning claw driving units (251). The positioning claws (250) are movably arranged at the four corners of the positioning frame (20) and correspond to the plurality of positioning holes at the bottom of the material trolley (30), and the front end of each positioning claw is provided with an inclined surface (250a). The positioning claw driving units (251) are connected to one end of the positioning claws (250) to drive the positioning claws (250) to extend and retract. A bearing (311a) is respectively arranged above each of the positioning holes (311), and when the material trolley (30) is located on the ground, the height of the bearings (311a) will be lower than the positioning claws (250). When the material trolley (30) enters the positioning frame (20), the trolley lifting mechanism (25) is activated to insert the positioning claws (250) into the positioning holes (311), and the inclined surface (250a) at the front end of each positioning claw (250) contacts the bearing (311a) above the positioning hole (311) and lifts it, thereby lifting the material trolley (30) to a predetermined height and leaving the ground. In this way, the height positions of the two material trolleys (30) when positioned in the two positioning frames (20) can be kept consistent and will not be affected by uneven ground.

[0036] The two tray lifting mechanisms (40) are respectively arranged on the two positioning frames (20) and respectively act on the two material trolleys (30) to lift the trays of the material trolleys (30). Specifically, each tray lifting mechanism (40) includes four top claw groups (41), four top claw telescopic drive units (42), four top claw lifting drive units (43), two clamping claw units (44) and two clamping claw drive units (45). Two top claw groups (41) are respectively arranged on opposite sides of the material trolley (30), and the two top claw groups (41) are arranged at opposite ends of the material trolley (30) at a certain distance. Each top claw group (41) has a plurality of top claws (410) arranged in an upper and lower interval, and the positions of the top claws (410) correspond to the supporting layers (33) of the material trolley (30). The four-claw telescopic driving unit (42) is respectively connected to the four-claw group (41) to drive the top claw group (41) to move in a direction close to or away from the material trolley (30). The four-claw lifting driving unit (43) is respectively connected to the four-claw group (41) to drive the top claw group (41) to move up and down in a vertical direction. The two clamping jaw units (44) are respectively arranged at the bottom of the positioning frame (20) and correspond to the two connecting parts (322) of the two bracket groups (32) of the material trolley (30), and are driven by the clamping jaw driving unit (45) to clamp the connecting parts, and can be further driven by the clamping jaw driving unit (45) to move in a direction close to or away from the material trolley (30), so that the bracket group (32) can be separated from the material trolley (30) or reset.

[0037] The first conveying mechanism (50) is arranged at the top of the central printing mechanism (10), and its two ends correspond to the two uppermost supporting layers (33) of the two material carriages (30), and is used to control the uppermost carrier of the material carriage (30) on the first side to move to the central printing mechanism (10) for printing, and drive the carrier located in the central printing mechanism (10) to move to the uppermost supporting layer (33) of the material carriage (30) on the second side for placement. Specifically, the first conveying mechanism (50) has two tracks (51), two transmission members (52), two carrier drive units (53), two hooks (54) and two push claws (55). The two tracks (51) are respectively arranged on opposite sides of the printing seat of the central printing mechanism (10). The two transmission members (52) are respectively arranged in the two tracks (51), and are used to be driven by a power source to rotate along a rotation direction. The two tray driving units (53) are movably arranged on the two tracks (51) and connected to the two transmission members (52), so as to be driven by the two transmission members (52) to move along the two tracks (51). The two hooks (54) are arranged on one side of the two tray driving units (53), so as to hook the tray (100) at the top of the material trolley (30) on the first side and move the tray to the central printing mechanism (10) along with the transmission member (52). The two push claws (55) are arranged on the other side of the two tray driving units (53) opposite to the two hooks (54), so as to push the tray located at the central printing mechanism (10) to move to the supporting layer (33) at the top of the material trolley (30) on the second side. The two carrier drive units (53) are used to be controlled to rise so that the two hook claws (54) or the two push claws (55) can contact the carrier (100), and to be controlled to fall when the carrier (100) moves to a predetermined position so that the two hook claws (54) or the two push claws (55) are separated from the carrier (100).

[0038] The second conveying mechanism (60) is arranged at the bottom of the central printing mechanism (10), and the two ends correspond to the two supporting layers (33) at the bottom of the two material trolleys (30), so as to be controlled to move the carrier (100) at the bottom of the material trolley (30) on the second side to the supporting layer (33) at the bottom of the material trolley (30) on the first side. The second conveying mechanism (60) includes a conveyor belt (61) and a conveyor belt lifting unit (62). In this embodiment, the conveyor belt (61) is a double-track synchronous PVC belt conveyor. The conveyor belt lifting unit (62) is arranged at the bottom of the conveyor belt (61) to control the conveyor belt (61) to be lifted or lowered. When the two material trolleys (30) on both sides enter the equipment for positioning, the two material trolleys (30) will be lifted so that the height positions of the two material trolleys (30) during positioning can be kept consistent and will not be affected by the uneven ground. Therefore, the bottom conveyor is designed to be movable up and down. When the two material trolleys (30) are not positioned, the conveyor belt lifting unit (62) drives the conveyor belt (61) to descend so that the two material trolleys (30) can enter and exit without interference. When the two material trolleys (30) are positioned, the conveyor belt lifting unit (62) drives the conveyor belt (61) to rise so that the conveyor belt (61) can receive the carrier (100) at the bottom of the two material trolleys (30).

[0039] The two drying mechanisms (70) are respectively arranged on the two opposite sides of the two positioning frames (20) to dry the carriers (100) in the material trolley (30). Specifically, each of the two opposite sides of the positioning frame (20) is respectively provided with a mounting groove (26) and a plurality of ventilation holes (27) connected to the mounting groove (26). The drying mechanisms (70) are installed in the mounting groove (26) of the positioning frame (20) and heat the mounting groove (26) through the ventilation holes (27). In the present embodiment, the drying mechanism (70) can be a hot air blower, an infrared drying machine, a filament drying machine or any other device that can heat and dry the carriers.

[0040] According to the above structural configuration, the stacked screen printing machine (1) provided by the present invention has the following practical operation applications:

[0041] See also Fig.10As shown, when the stacked screen printer (1) of the present invention performs a printing operation, the carrier (100) at the top of the material trolley (30) on the first side is moved by the first conveying mechanism (50) to the central printing mechanism (10) for printing. Then, the carrier lifting mechanism (40) located on the first side moves the remaining carriers (100) of the material trolley (30) on the first side upward by one layer. Then, the carrier (100) at the bottom of the material trolley (30) on the second side is moved by the second conveying mechanism (60) to the supporting layer (33) at the bottom of the material trolley (30) on the first side. Then, the carrier lifting mechanism (40) on the second side moves the remaining carriers (100) of the material trolley (30) on the second side downward by one layer. Next, after the central printing mechanism (10) completes printing, the carrier (100) is moved by the first conveying mechanism (50) to the uppermost supporting layer (33) of the material carriage (30) on the second side. The carriers (100) of the two material carriages (30) will be moved N times in sequence until the printing operation of each carrier (100) is completed, so that the printed products on the carriers (100) can complete the stacking printing operation at a single printing station. Wherein N is a positive integer greater than 2.

[0042] The detailed mechanism of the tray lifting mechanism (40) on the first side to raise the trays (100) of the material trolley (30) by one level will be further described below. Fig.11 As shown, when the tray lifting mechanism (40) on the first side is in the standby state, the top claw telescopic drive units (42) are in the retracted state, and the top claw lifting drive units (43) are in the retracted state. At this time, the trays (100) and the top claw groups (41) are not in contact. When the tray (100) at the top of the material trolley (30) is moved to the central printing mechanism (10) by the first conveying mechanism (50), the tray lifting mechanism (40) on the first side starts to operate. First, as shown in FIG. Fig.12 As shown, the top claw extension drive units (42) drive the top claw groups (41) to extend obliquely upwards towards the direction close to the material trolley (30), so that the top claws of the top claw groups (41) extend into the supporting layers (33) of the material trolley (30) and lift the carriers (100) upwards. Fig.13 As shown, the two clamping jaw driving units (45) control the two clamping jaw units (44) to clamp the two connecting parts of the two bracket sets (32) and move them outward, so that the two bracket sets (32) are separated from the material trolley (30). It is worth noting that since the two bracket sets (32) are separated from the material trolley (30), the carriers (100) are no longer supported by the two bracket sets (32), and the two bracket sets (32) will not block the movement of the carriers (100) in the vertical direction. Fig.14As shown, the top claw lifting drive units (43) drive the top claw groups (41) to move upward, so that the carriers (100) are lifted upward synchronously. The distance that the carriers (100) move upward is approximately the height of the supporting layer (33). Fig.15 As shown, the two clamping jaw driving units (45) control the two clamping jaw units (44) to move inwards, so that the two bracket sets (32) are reconnected to the material trolley (30). Fig.16 As shown, the top claw retracting drive units (42) drive the top claw groups (41) to retract obliquely downward in a direction away from the material trolley (30), so that the top claws of the top claw groups (41) leave the supporting layers (33) of the material trolley (30) and the carriers (100) are supported by the supporting plates (321) of the two bracket groups (32) again. Fig.17 As shown, the top claw lifting drive units (43) drive the top claw groups (41) to move downward, so that the top claw groups (41) return to the standby position to complete the current carrier lifting operation. It should be noted that at this time, the position of each carrier (100) has moved up one layer compared to the beginning, so that the supporting layer (33) on the top of the material trolley (30) on the first side can always maintain a state where there is a carrier (100) available for movement.

[0043] On the other hand, the detailed mechanism of the trays (100) of the material trolley (30) on the second side being lifted down by the tray lifting mechanism (40) is similar to the lifting mechanism, except that the starting position and moving direction of the top claw are opposite. When the tray lifting mechanism (40) on the second side is in the standby state, the top claw telescopic drive units (42) are in the extended state, and the top claw lifting drive units (43) are in the retracted state, so the initial position of the top claw group (41) is relatively upward. When the tray (100) of the central printing mechanism (10) is moved by the first conveying mechanism (50) to the uppermost supporting layer (33) of the material trolley (30) on the second side, the tray lifting mechanism (40) on the second side starts to operate. First, the top claw extension and retraction drive units (42) drive the top claw groups (41) to extend obliquely upward in the direction close to the material trolley (30), so that the top claws of the top claw groups (41) extend into the supporting layers (33) of the material trolley (30) and lift the carriers (100) upward. Then, the two clamping claw drive units (45) control the two clamping claw units (44) to clamp the two connecting parts of the two bracket groups (32) and move outward, so that the two bracket groups (32) are separated from the material trolley (30). Then, the top claw lifting and lowering drive units (43) drive the top claw groups (41) to move downward, so that the carriers (100) move downward synchronously. The distance that the carriers (100) move downward is approximately the height of the supporting layer (33). Next, the two clamping jaw driving units (45) control the two clamping jaw units (44) to move inward, so that the two bracket groups (32) are reconnected to the material trolley (30). Next, the top jaw telescopic driving units (42) drive the top jaw groups (41) to retract obliquely downward in a direction away from the material trolley (30), so that the top jaws of the top jaw groups (41) leave the supporting layers (33) of the material trolley (30) and the carriers (100) are supported by the supporting sheets (321) of the two bracket groups (32) again. Finally, the top jaw lifting driving units (43) drive the top jaw groups (41) to move upward, so that the top jaw groups (41) return to the standby position to complete the current carrier lowering operation. It should be noted that at this time, the position of each carrier (100) has moved down one level compared to the beginning, whereby the supporting layer (33) on the top of the material trolley (30) on the second side can always maintain a state of being able to accommodate the carrier.

[0044] It should be added that, in addition to being used in the form of a single printing station, the stacked screen printer of the present invention can also be configured as a modular production line design in another preferred embodiment, consisting of a plurality of printing stations, a material discharging station, and a material trolley. The material trolleys can move between the material discharging stations and the printing stations as needed, and the production line can be flexibly adjusted according to the production process of the product. For example, three-dimensional priming that requires a lot of time can be assigned to multiple stations for processing, and then combined with a subsequent single station coloring. This can meet more complex or large-volume printing operations.

[0045] In summary, the stacked screen printer provided by the present invention provides a single modular printer to the user, so that the carriers can be continuously lifted and cyclically moved between the two material trolleys and the central printing mechanism (10), thereby performing repeated stacked printing in a single printer. In addition, the present invention can also be used with the material trolleys that can be quickly positioned to achieve multi-station printing station serial printing production. The design of the single modularization and material trolleys makes it easier to cope with the different printing times and process compositions of the product, and the arrangement of the production line is more flexible.

Claims

1. A stacked screen printing machine, characterized in that It includes: a central printing mechanism for printing on a carrier; the central printing mechanism has a first side and a second side on opposite sides; two positioning frames, respectively connected to the first side and the second side of the central printing mechanism; two material trolleys, respectively arranged in the two positioning frames on the first side and the second side in a movable manner, each of the material trolleys having a plurality of supporting layers arranged in an upper and lower interval, for placing a plurality of the carriers; a first conveying mechanism, movably arranged on the top of the central printing mechanism, with its two ends respectively corresponding to the two uppermost supporting layers of the two material trolleys; a second conveying mechanism, movably arranged on the bottom of the central printing mechanism, with its two ends respectively corresponding to the two lowermost supporting layers of the two material trolleys; and two carrier lifting mechanisms, respectively arranged on the two positioning frames in a movably movable manner, for being controlled The carriers on the material trolley located in the positioning frame are moved up and down; wherein, when a printing operation is performed, the carrier at the top of the material trolley on the first side is moved by the first conveying mechanism to the central printing mechanism for printing, and the carrier lifting mechanism located on the first side moves the remaining carriers of the material trolley on the first side up by one layer; the carrier at the bottom of the material trolley on the second side is moved by the second conveying mechanism to the bottom supporting layer of the material trolley on the first side, and the carrier lifting mechanism on the second side moves the remaining carriers of the material trolley on the second side down by one layer; after the central printing mechanism completes printing, the carrier is moved by the first conveying mechanism to the top supporting layer of the material trolley on the second side, and the carriers of the two material trolleys are circulated in sequence until the printing operation of each carrier is completed.

2. According to the stacked screen printing machine described in claim 1, it is characterized in that the carrier lifting mechanism includes a plurality of top claw groups, a plurality of top claw telescopic driving units and a plurality of top claw lifting driving units; the top claw groups are arranged on the opposite sides of the material trolley, and each of the top claw groups has a plurality of top claws, respectively corresponding to the supporting layers of the material trolley; the top claw telescopic driving units are respectively connected to the top claw groups to drive the top claw groups to move toward or away from the material trolley; the top claw lifting driving units are respectively connected to the four top claw groups to drive the top claw groups to move up and down in the vertical direction.

3. According to the stacked screen printing machine described in claim 1, it is characterized in that two detachable bracket groups are provided on the opposite sides of each material trolley, and each of the bracket groups has a plurality of supporting plates arranged up and down and extending inward; the supporting layers are formed between the supporting plates, so that when the carriers are placed on the supporting layers, the bottoms of the carriers are against the supporting plates.

4. According to the stacked screen printing machine described in claim 1, it is characterized in that the carrier lifting mechanism further includes two clamping units and two clamping driving units; the two clamping units are respectively arranged at the bottom of the positioning frame and correspond to the two connecting parts of the two bracket groups of the material trolley, and the two clamping driving units are movably connected to the two clamping units to drive the two clamping units to clamp the two connecting parts and move in a direction close to or away from the material trolley, so that the two bracket groups can be separated outward from the material trolley or reset inward.

5. The stacked screen printing machine according to claim 1, characterized in that The positioning frame further includes a trolley positioning mechanism, which has two handles arranged on opposite sides of the positioning frame and can be operated to move between an open position and a closed position, so as to be operated to move from the open position to the closed position when the material trolley enters the positioning frame, thereby restricting the material trolley from leaving the positioning frame.

6. The stacked screen printing machine according to claim 1, characterized in that The positioning frame further includes a vehicle lifting mechanism having a plurality of positioning claws and a plurality of positioning claw driving units; The positioning claws are movably arranged at the four corners of the positioning frame and correspond to the multiple positioning holes at the bottom of the material trolley. The positioning claw driving units are movably connected to one end of the positioning claws to drive the positioning claws to extend, retract and lift. When the material trolley enters the positioning frame, the positioning claws can extend into the positioning holes of the material trolley to be fixed, and rise to lift the material trolley to a predetermined height.

7. The stacked screen printing machine according to claim 1 is characterized in that the first conveying mechanism has two tracks, two transmission members, two carrier drive units, two hooks and two push claws; the two tracks are respectively arranged on opposite sides of the central printing mechanism, the two transmission members are respectively arranged in the two tracks, and are driven by a power source to rotate along a rotation direction, the two carrier drive units are movably arranged on the two tracks and connected to the two transmission members, and are driven by the two transmission members to move along the two tracks, the two hooks are arranged on one side of the two carrier drive units, and are used to hook the carrier at the top of the material trolley on the first side and move the carrier to the central printing mechanism along with the transmission member, and the two push claws are arranged on the other side of the two carrier drive units opposite to the two hooks, and are used to push the carrier located at the central printing mechanism to move to the supporting layer at the top of the material trolley on the second side.

8. The stacked screen printing machine according to claim 1 is characterized in that the second conveying mechanism has a conveyor belt and a conveyor belt lifting unit; the conveyor belt is driven to rotate along a rotation direction, and the conveyor belt lifting unit is arranged at the bottom of the conveyor belt to drive the conveyor belt to move up and down so that the height of the conveyor belt moves to the supporting layer corresponding to the bottom of the two material trolleys.

9. The stacked screen printing machine according to claim 1 is characterized by further comprising a drying mechanism, which is arranged on one side of the positioning frame and is used for being controlled to dry the carriers in the two material trolleys.

10. The stacked screen printing machine according to claim 1, characterized in that The central printing mechanism includes a printing seat and a printing seat lifting device; the printing seat is used to place the carrier, and the printing seat lifting device is movably connected to the printing seat to drive the printing seat to move along the Z-axis direction to control the height of the printing seat.

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