A textile fabric printing and dyeing device and method

Abstract

The present invention belongs to the technical field of textile processing, and specifically relates to a textile fabric printing and dyeing device and method. Through the setting of a lifting mechanism, the fabric can be lifted accordingly when the fabric is subjected to spray printing processing, forcing the fabric to remain in a straight state through its own elasticity and ductility, so as to reduce the appearance of wrinkles and raised parts and improve the effect of spray printing. The setting of a self-flipping component and a positioning component can flip and switch the flip plate after a single spray printing is completed, and keep the plate surface unidirectionally fixed after the switching is completed. In conjunction with the cleaning of the plate surface by a cleaner, the interference and pollution of subsequent fabrics by the pigment seeping down during spray printing can be reduced, thereby improving the quality of processing.

Description

Technical Field

[0001] The invention belongs to the technical field of textile processing, and in particular relates to a textile fabric printing and dyeing device and method. Background Art

[0002] At present, when processing textile fabrics, in order to improve the artistic quality of the fabrics, colors and patterns are printed and dyed on the fabrics. With the advancement of textile technology, in the face of diversified demands, inkjet printing is gradually used for printing and dyeing of textile fabrics due to its high flexibility and simple design.

[0003] Conventional printing processing methods mostly use a conveyor to pull and transport the fabric, so that the fabric passes through the printing equipment. At this time, the printing equipment sprays the designed pattern on the fabric. However, due to the elasticity and ductility of the fabric itself, the conventional printing method only pulls the fabric flat on the plane through the external conveyor. In this way, more time is required for the pigment to penetrate into the gaps in the fabric after printing, resulting in prolonged drying time and subsequent sprayed pigment mixing and affecting the color. At the same time, the infiltrated pigment may remain on the lower plane, causing the subsequent fabric to be contaminated during printing and affecting the overall quality. Summary of the invention

[0004] The purpose of the present invention is to provide a textile fabric printing and dyeing device and method to solve the problems mentioned in the background technology.

[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0006] A textile fabric printing and dyeing device comprises a base, a control panel, a printing mechanism and a belt conveyor, wherein the number of the belt conveyors is two and they are arranged on both sides of the base, the printing mechanism is arranged on the base, and a lifting mechanism is also arranged between the base and the printing mechanism;

[0007] The lifting mechanism includes a lifting rod, a lower platform, an upper top plate group, a self-turning component and a positioning component. The lifting rod slides through the lower end of the base and is connected to the external lifting mechanism. The lower platform is connected to the upper end of the lifting rod. The upper top plate group is arranged at the upper end of the lower platform and corresponds to the position of the printing mechanism. The self-turning component is arranged on the lower platform. The positioning component is arranged on the base and corresponds to the self-turning component.

[0008] The number of the upper top plate groups is several and they are arranged in an array at the upper end of the lower platform. The upper top plate group includes a flap, a support frame and a gear. The number of the support frames is two and they are symmetrically arranged at the upper end of the lower platform front and back. The flap is rotatably arranged between the two support frames. The gear is rotatably arranged on a support frame and is coaxially connected to the rotating axis of the flap. The self-flipping assembly is slidably arranged at the upper end of the lower platform through a supporting slide rail.

[0009] The self-flipping assembly includes a rack, an abutment bar and a cleaner. The supporting slide rail is fixedly arranged at the upper end of the lower platform and corresponds to the projection extension line area of ​​the gear. The rack is slidably arranged at the upper end of the supporting slide rail and meshes with a plurality of gears. There are two abutment bars, which are respectively arranged at both ends of the rack. The abutment bar is an L-shaped structure as a whole and the right-angle opening side faces the middle of the base. The cleaner is arranged between the upper end of the lower platform and the upper top plate group.

[0010] The cleaner includes an electric-controlled slide rail and a cleaning brush. The cleaning brush is slidably connected to the electric-controlled slide rail through a slider and its moving length matches the length of the flap. There is a gap between the end of the flap and the support frame that matches the thickness of the cleaning brush. The brushing part of the cleaning brush corresponds to the horizontal surface line position of several flaps.

[0011] An adaptive part is also provided between the cleaning brush and the lower platform, and the adaptive part includes a lifting platform, a first elastic telescopic rod and a contact rod. The lifting platform is provided at the upper end of the lower platform and is in a right-angle trapezoid as a whole. The contact rod is fixed at the lower end of the cleaning brush and corresponds to the position of the lifting platform. The first elastic telescopic rod is provided between the cleaning brush and the slider and pushes the cleaning brush to move downward in the initial state.

[0012] The positioning assembly consists of two paddles, which are symmetrical and staggered up and down on the inner side of the base. The paddles are elastically hinged to the base and flip downward in a stationary state. The positions of the two paddles correspond to the two abutment bars respectively and are tilted from top to bottom toward the middle of the lower platform. The maximum acute angle of the paddle flipping downward with the ground as the horizontal reference line is 30°-60°, and the plane projection length of the paddle is greater than the moving distance when the rack driving gear rotates 180°.

[0013] A second elastic telescopic rod is also provided between the abutment bar and the rack, which connects the abutment bar and the rack and keeps them away from each other in a static state, and the minimum compression resistance of the second elastic telescopic rod is greater than the resistance when the rack drives several gears.

[0014] The lower end of the rack is symmetrically provided with a magnetic block with the supporting slide rail as the midline, the side of the supporting slide rail is magnetically matched with the magnetic block, the spacing distance between the magnetic block and the supporting slide rail corresponds to the moving distance when the rack driving gear rotates 180°, and the adsorption force between the magnetic block and the supporting slide rail is greater than the resistance when the abutment rod pushes the paddle upward.

[0015] A textile fabric printing and dyeing method, the specific method is as follows:

[0016] When printing and dyeing is carried out, the printed and dyed fabric is sequentially passed through the belt conveyor, the printing mechanism and another belt conveyor to form a continuous conveying condition, wherein the fabric needs to pass between the printing mechanism and the lifting mechanism; during processing, the clamping mechanism on the belt conveyor clamps the fabric to form a printing section corresponding to the printing mechanism, and the lifting mechanism is started to slightly lift the fabric upward through the upper top plate group, and the elasticity and ductility of the fabric itself are used to flatten it and keep it in a relatively straight state. At this time, the printing mechanism performs printing processing on the fabric, and the lifting mechanism is reset after the printing is completed, and the clamping mechanism on the belt conveyor is relaxed; when the lifting mechanism resets downward, the downward movement will be extended, and the upper top plate group will be flipped by the self-flipping component and the positioning component, wherein the paddle positions of the two positioning components are staggered up and down, and the downward movement distance of the lifting mechanism is controlled by the control panel, and the two paddles can be matched respectively to achieve a step-by-step flipping of the upper top plate group, so as to achieve the switching and cleaning of the upper top plate group after each printing process.

[0017] Compared with the prior art, the present invention has at least the following advantages:

[0018] By setting up the lifting mechanism, the fabric can be lifted accordingly when it is printed, forcing the fabric to remain straight through its own elasticity and ductility, so as to reduce the appearance of wrinkles and raised parts and improve the printing effect. The self-flipping component and the positioning component can flip and switch the flip plate after a single printing is completed, and keep the plate surface fixed in one direction after the switching is completed. In conjunction with the cleaning of the plate surface by the cleaner, the interference and pollution of subsequent fabrics by the pigment seeping down during printing can be reduced, thereby improving the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a structural schematic diagram of the jacking mechanism of the present invention.

[0022] Figure 3 The schematic diagram of the structure of the lifting mechanism of the present invention is shown in FIG. 1 , with the base removed.

[0023] Figure 4 It is a structural sectional view of the jacking mechanism of the present invention.

[0024] Figure 5 It is a schematic diagram of the structure of the base and the paddle of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the jacking mechanism of the present invention from another angle.

[0026] Base 1, printing mechanism 11, belt conveyor 12, lifting rod 2, lower platform 21, supporting slide rail 22, flap 3, supporting frame 31, gear 32, rack 4, abutment bar 41, electric control slide rail 5, cleaning brush 51, lifting platform 52, first elastic telescopic rod 53, abutment rod 54, paddle 6, second elastic telescopic rod 7, magnetic suction block 8. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Example 1: Figure 1-6 As shown, a textile fabric printing and dyeing device includes a base 1, a control panel, a printing mechanism 11 and a belt conveyor 12, wherein the number of the belt conveyor 12 is two and they are arranged on both sides of the base 1, the printing mechanism 11 is arranged on the base 1, and a lifting mechanism is also arranged between the base 1 and the printing mechanism 11;

[0029] The lifting mechanism includes a lifting rod 2, a lower platform 21, an upper top plate group, a self-turning component and a positioning component. The lifting rod 2 slides through the lower end of the base 1 and is connected to the external lifting mechanism. The lower platform 21 is connected to the upper end of the lifting rod 2. The upper top plate group is arranged at the upper end of the lower platform 21 and matches the position of the printing mechanism 11. The self-turning component is arranged on the lower platform 21. The positioning component is arranged on the base 1 and matches the self-turning component.

[0030] There are several upper top plate groups and they are arranged in an array at the upper end of the lower platform 21. The upper top plate group includes a flap 3, a support frame 31 and a gear 32. There are two support frames 31 and they are symmetrically arranged at the upper end of the lower platform 21. The flap 3 is rotatably arranged between the two support frames 31. The gear 32 is rotatably arranged on one support frame 31 and is coaxially connected to the rotating axis of the flap 3. The self-flipping assembly is slidably arranged on the upper end of the lower platform 21 through the support slide rail 22.

[0031] Before printing and dyeing the fabric, the fabric is fed from the belt conveyor 12 on one side and passes through the printing mechanism 11 and the other belt conveyor 12, wherein the fabric needs to be located between the printing mechanism 11 and the lifting mechanism. After the connection is completed, the fabric can be controlled by the control panel to perform the printing process;

[0032] During processing, the cloth is first clamped by the clamping mechanism on the upper side of the belt conveyor 12, wherein the clamping mechanism can be clamped by a cylinder and a pressure plate, or by other clamping means. After the cloth located in the printing mechanism 11 and the lifting mechanism area is clamped and fixed, the lifting mechanism is turned on through the control panel, wherein the lifting rod 2 in the lifting mechanism is lifted upward by an external lifting mechanism such as a cylinder or a hydraulic cylinder, so that the cloth in the printing mechanism 11 area can be lifted upward by the upper top plate group on the lower platform 21. At this time, the elasticity and ductility of the cloth itself can be used to straighten the cloth. On the one hand, it can effectively remove the wrinkles and bulges that may be generated in the cloth during transportation, and on the other hand, it can make the cloth processed in a relatively tight state during printing, so that the printed pattern can be more regular and the speed of the pigment penetrating into the fiber gap of the cloth can be accelerated, thereby improving the drying speed and shaping speed after printing, so as to reduce the occurrence of contamination or pigment infiltration in the subsequent process;

[0033] When a single printing process is completed, the clamping mechanism on the belt conveyor 12 cancels the clamping of the cloth, and the lifting mechanism is reset to switch the area of ​​the printed cloth and continue to convey the cloth. In order to reduce the pollution of the pigment seeping from the printing to the cloth and affect the processing quality, when the lifting mechanism completes a single lifting printing process and resets, the lifting rod 2 will drive the lower platform 21 to extend and move downward. At this time, the self-flipping component provided on the lower platform 21 and matched with the gear 32 will abut against the positioning component, and then act on the gear 32 to rotate it, so that the flap 3 can be flipped, and after flipping 180°, it stops and maintains a relatively stable state and resets upward to perform the next printing process. At the same time, the self-flipping component will clean the surface of the flap 3 processed last time, so as to form a processing flow of cyclically switching the surface and cleaning the surface, so that the residual pigment seeping from the surface can be cleaned and the influence of adhesion on the cloth can be reduced.

[0034] The self-flipping assembly includes a rack 4, an abutment bar 41 and a cleaner. The support slide rail 22 is fixedly arranged at the upper end of the lower platform 21 and corresponds to the projection extension line area of ​​the gear 32. The rack 4 is slidably arranged at the upper end of the support slide rail 22 and meshes with a plurality of gears 32. There are two abutment bars 41, which are respectively arranged at both ends of the rack 4. The abutment bar 41 is an overall L-shaped structure with the right-angle opening side facing the middle of the base 1. The cleaner is arranged between the upper end of the lower platform 21 and the upper top plate group.

[0035] The cleaner includes an electric-controlled slide rail 5 and a cleaning brush 51. The cleaning brush 51 is slidably connected to the electric-controlled slide rail 5 through a slider and its moving length matches the length of the flap 3. There is a gap between the end of the flap 3 and the support frame 31 that matches the thickness of the cleaning brush 51. The brushing part of the cleaning brush 51 corresponds to the horizontal surface line position of several flaps 3.

[0036] The positioning assembly consists of two paddles 6, which are symmetrical and staggered up and down on the inner side of the base 1. The paddles 6 are elastically hinged to the base 1 and flip downward in a stationary state. The positions of the two paddles 6 correspond to the two abutment bars 41 respectively and are tilted from top to bottom toward the middle of the lower platform 21. The maximum acute angle of the paddle 6 when flipped downward with the ground as the horizontal reference line is 30°-60°, and the plane projection length of the paddle 6 is greater than the moving distance when the rack 4 drives the gear 32 to rotate 180°.

[0037] When the gear 32 is rotated 180°, the gear 32 is disengaged from the gear 32 and the gear 32 is disengaged from the gear 32.

[0038] After the board surface is switched, when the lower platform 21 moves upward for the next processing, since the paddle 6 can be flipped upward, the extended abutment bar 41 will push the paddle 6 to flip upward when abutting against the paddle 6 without producing an abutment effect on the abutment bar 41, until it completely passes over the paddle 6, and the paddle 6 flips and resets through its own elastic force such as a torsion spring, a clockwork spring, etc., among which since the two paddles 6 are staggered up and down, when the flip plate 3 needs to switch the board surface, the lifting rod 2 drives the lower platform 21 to move to different heights to achieve the abutment effect with the paddles 6 at different position heights, which can meet the left and right movement of the rack 4, thereby playing a role in switching the board surface of the flip plate 3.

[0039] A magnetic block 8 is symmetrically provided on the lower end of the rack 4 with the supporting slide rail 22 as the midline. The side of the supporting slide rail is magnetically matched with the magnetic block 8. The spacing distance between the magnetic block 8 and the supporting slide rail corresponds to the moving distance when the rack 4 drives the gear 32 to rotate 180°. The adsorption force between the magnetic block 8 and the supporting slide rail 22 is greater than the resistance when the abutment rod pushes the paddle 6 upward.

[0040] In order to further limit the movement stroke of the rack 4 and improve the stability after the panel is switched, when the rack 4 moves to one side, the magnetic block 8 will be adsorbed on the side of the supporting slide rail, wherein the magnetic block 8 and the supporting slide rail travel blocking can limit the displacement of the rack 4 to ensure that the flip angle of the flap 3 is 180°. After the magnetic block 8 is adsorbed on the support rail, the movement of the rack 4 can have a certain resistance, so that when the rack 4 is accidentally touched by the outside world or the edge of the flap 3 is pressed down, it can play a corresponding resistance limit. Of course, if necessary, the supporting slide rail can be provided with an electromagnet matching the magnetic block 8 to further increase the suction force to achieve the effect of forced locking.

[0041] Example 2: Figure 2-4 As shown in Figure 6, it is a further improvement on the basis of Example 1. An adaptive part is further provided between the cleaning brush 51 and the lower platform 21. The adaptive part includes a lifting platform 52, a first elastic telescopic rod 53 and abutment rod 54. The lifting platform 52 is provided at the upper end of the lower platform 21 and is in a right-angle trapezoidal shape as a whole. The lifting platform 52 is provided at the upper end of the lower platform 21. The abutment rod 54 is fixedly provided at the lower end of the cleaning brush 51 and corresponds to the position of the lifting platform 52. The first elastic telescopic rod 53 is provided between the cleaning brush 51 and the slider and pushes the cleaning brush 51 to move downward in the initial state.

[0042] Furthermore, in order to improve the cleaning effect, as the number of cleaning times and time increase, the brush surface of the cleaning brush 51 may be deformed or collapsed due to cleaning. In this way, when the cleaning brush 51 moves with the electric control slide rail 5, the abutment rod 54 at the lower end will be blocked by the lifting platform 52 and act on the cleaning brush 51, thereby causing the first elastic telescopic rod 53 to extend upward to cause the cleaning brush 51 to move upward. This can improve the cleaning effect of the cleaning brush 51 on the surface of the flap 3 and increase the friction resistance of brushing. At the same time, it can avoid the cleaning brush 51 from extending prematurely when moving toward the board surface, resulting in abutment with the side of the board surface.

[0043] Example 3: Figure 3 As shown, based on the further improvement of Example 1, a second elastic telescopic rod 7 is further provided between the abutment bar 41 and the rack 4, the second elastic telescopic rod 7 connects the abutment bar 41 and the rack 4 and keeps the two away from each other in a stationary state, and the minimum compression resistance of the second elastic telescopic rod 7 is greater than the resistance when the rack 4 drives a plurality of gears 32.

[0044] Furthermore, in order to avoid the abutment resistance between the abutment bar 41 and the paddle 6, reduce the precision requirements for equipment installation, and increase the blank compatibility stroke between components, the second elastic telescopic rod 7 is provided to enable the abutment bar 41 to have a certain movement stroke to satisfy the remaining abutment movement part between the abutment bar 41 and the paddle 6 after the rack 4 is completely pushed to drive the flap 3 to rotate 180°, wherein the telescopic elastic force of the first elastic telescopic rod 53 and the second elastic telescopic rod 7 can be reset by components with reset elasticity such as springs and shrapnel.

[0045] A textile fabric printing and dyeing method, the specific method is as follows:

[0046] When printing and dyeing is carried out, the printed and dyed fabric is sequentially passed through the belt conveyor 12, the printing mechanism 11 and another belt conveyor 12 to form a continuous conveying condition, wherein the fabric needs to pass between the printing mechanism 11 and the lifting mechanism; when processing is carried out, the clamping mechanism on the belt conveyor clamps the fabric to form a printing section corresponding to the printing mechanism 11, and the lifting mechanism is started to slightly lift the fabric upward through the upper top plate group, and the elasticity and ductility of the fabric itself are used to flatten it and keep it in a relatively straight state, at this time, the printing mechanism 11 performs printing processing on the fabric, and the lifting mechanism is reset after the printing is completed, and the clamping mechanism on the belt conveyor is relaxed; when the lifting mechanism resets downward, it will extend the downward movement, and the upper top plate group will be flipped by the self-flipping component and the positioning component, wherein the paddles 6 of the two positioning components are staggered up and down, and the downward movement distance of the lifting mechanism is controlled by the control panel, and the two paddles 6 can be matched respectively to achieve step-by-step flipping of the upper top plate group, so as to achieve the switching and cleaning of the upper top plate group after each printing process.

[0047] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A textile fabric printing and dyeing device, comprising a base, a control panel, a printing mechanism and a belt conveyor, wherein the number of the belt conveyors is two and they are arranged on both sides of the base, and the printing mechanism is arranged on the base, characterized in that: A lifting mechanism is also provided between the base and the printing mechanism; The lifting mechanism includes a lifting rod, a lower platform, an upper top plate group, a self-turning component and a positioning component. The lifting rod slides through the lower end of the base and is connected to the external lifting mechanism. The lower platform is connected to the upper end of the lifting rod. The upper top plate group is arranged at the upper end of the lower platform and corresponds to the position of the printing mechanism. The self-turning component is arranged on the lower platform. The positioning component is arranged on the base and corresponds to the self-turning component. The number of the upper top plate groups is several and they are arranged in an array at the upper end of the lower platform. The upper top plate group includes a flap, a support frame and a gear. The number of the support frames is two and they are symmetrically arranged at the upper end of the lower platform front and back. The flap is rotatably arranged between the two support frames. The gear is rotatably arranged on a support frame and is coaxially connected to the rotating axis of the flap. The self-flipping assembly is slidably arranged at the upper end of the lower platform through a supporting slide rail.

2. A textile fabric printing and dyeing device according to claim 1, characterized in that: The self-flipping assembly includes a rack, an abutment bar and a cleaner. The supporting slide rail is fixedly arranged at the upper end of the lower platform and corresponds to the projection extension line area of ​​the gear. The rack is slidably arranged at the upper end of the supporting slide rail and meshes with a plurality of gears. There are two abutment bars, which are respectively arranged at both ends of the rack. The abutment bar is an L-shaped structure as a whole and the right-angle opening side faces the middle of the base. The cleaner is arranged between the upper end of the lower platform and the upper top plate group.

3. A textile fabric printing and dyeing device according to claim 2, characterized in that: The cleaner includes an electric-controlled slide rail and a cleaning brush. The cleaning brush is slidably connected to the electric-controlled slide rail through a slider and its moving length matches the length of the flap. There is a gap between the end of the flap and the support frame that matches the thickness of the cleaning brush. The brushing part of the cleaning brush corresponds to the horizontal surface line position of several flaps.

4. A textile fabric printing and dyeing device according to claim 3, characterized in that: An adaptive part is also provided between the cleaning brush and the lower platform, and the adaptive part includes a lifting platform, a first elastic telescopic rod and a contact rod. The lifting platform is provided at the upper end of the lower platform and is in a right-angle trapezoid as a whole. The contact rod is fixed at the lower end of the cleaning brush and corresponds to the position of the lifting platform. The first elastic telescopic rod is provided between the cleaning brush and the slider and pushes the cleaning brush to move downward in the initial state.

5. A textile fabric printing and dyeing device according to claim 4, characterized in that: The positioning assembly consists of two paddles, which are symmetrical and staggered up and down on the inner side of the base. The paddles are elastically hinged to the base and flip downward in a stationary state. The positions of the two paddles correspond to the two abutment bars respectively and are tilted from top to bottom toward the middle of the lower platform. The maximum acute angle of the paddle flipping downward with the ground as the horizontal reference line is 30°-60°, and the plane projection length of the paddle is greater than the moving distance when the rack driving gear rotates 180°.

6. A textile fabric printing and dyeing device according to claim 5, characterized in that: A second elastic telescopic rod is also provided between the abutment bar and the rack, which connects the abutment bar and the rack and keeps them away from each other in a static state, and the minimum compression resistance of the second elastic telescopic rod is greater than the resistance when the rack drives several gears.

7. A textile fabric printing and dyeing device according to claim 6, characterized in that: The lower end of the rack is symmetrically provided with a magnetic block with the supporting slide rail as the midline, the side of the supporting slide rail is magnetically matched with the magnetic block, the spacing distance between the magnetic block and the supporting slide rail corresponds to the moving distance when the rack driving gear rotates 180°, and the adsorption force between the magnetic block and the supporting slide rail is greater than the resistance when the abutment rod pushes the paddle upward.

8. A textile fabric printing and dyeing method, characterized in that: The textile fabric printing and dyeing device according to any one of claims 1 to 7 is used for printing and dyeing, and the specific method is as follows: When printing and dyeing is carried out, the printed and dyed fabric is sequentially passed through the belt conveyor, the printing mechanism and another belt conveyor to form a continuous conveying condition, wherein the fabric needs to pass between the printing mechanism and the lifting mechanism; during processing, the clamping mechanism on the belt conveyor clamps the fabric to form a printing section corresponding to the printing mechanism, and the lifting mechanism is started to slightly lift the fabric upward through the upper top plate group, and the elasticity and ductility of the fabric itself are used to flatten it and keep it in a relatively straight state. At this time, the printing mechanism performs printing processing on the fabric, and the lifting mechanism is reset after the printing is completed, and the clamping mechanism on the belt conveyor is relaxed; when the lifting mechanism resets downward, the downward movement will be extended, and the upper top plate group will be flipped by the self-flipping component and the positioning component, wherein the paddle positions of the two positioning components are staggered up and down, and the downward movement distance of the lifting mechanism is controlled by the control panel, and the two paddles can be matched respectively to achieve a step-by-step flipping of the upper top plate group, so as to achieve the switching and cleaning of the upper top plate group after each printing process.

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