Jet printing equipment and self-cleaning method thereof

Abstract

The invention discloses a jet printing device and a self-cleaning method thereof.In the jet printing device, under the cooperation of all conveying units of a conveying module, a workpiece can be conveyed into a jet printing area so that the jet printing module can conduct jet printing on the workpiece, and when the jet printing module needs to be cleaned, the workpiece can be conveyed to the jet printing area; when the jet printing equipment works, the driving assembly can drive the first conveying unit to be separated from the jet printing area, at the moment, all the nozzles in the jet printing module can conduct flash spraying at the same time so as to achieve conduction of the nozzles, and therefore blockage of the interiors of the nozzles can be prevented, and when the jet printing equipment works, the nozzles of the jet printing module are controlled to conduct flash spraying at set intervals; therefore, the nozzle can be continuously kept conducting, and a worker does not need to move the whole jet printing module to manually clean a spray head in the jet printing module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of inkjet printing, and in particular, to an inkjet printing device and a self-cleaning method thereof. BACKGROUND

[0002] With the development of the times, the progress of science and technology, and the urgent need for energy saving and emission reduction, digital inkjet printing devices are born to replace traditional printing devices, and the digital inkjet printing devices generally use inkjet printing.

[0003] In the related art, after the inkjet module is used for a period of time, some nozzles in the inkjet module will be dry due to low use frequency, and thus the nozzles will be blocked. In order to ensure the normal work of the inkjet module, the inkjet module needs to be cleaned regularly to unblock the nozzles.

[0004] However, in the current technology, after the inkjet module works for a period of time, the inkjet module needs to be removed from the inkjet printing device and manually cleaned. After the nozzles are cleaned, the inkjet module is moved into the inkjet printing device. During the work of the inkjet printing device, the worker needs to clean the nozzles frequently, and the convenience of nozzle cleaning is poor. SUMMARY

[0005] The present application aims to at least solve one of the problems in the prior art. The present application provides an inkjet printing device capable of preventing nozzle blockage in a first aspect. The present application also provides a self-cleaning method of an inkjet printing device in a second aspect.

[0006] The inkjet printing device provided by the first aspect of the present application comprises an inkjet module and a conveying module. A printing area is formed directly below the inkjet module, and the inkjet module comprises nozzles for inkjet printing. The conveying module comprises a driving assembly and a plurality of conveying units. The plurality of conveying units are distributed along a preset direction and are used to cooperate with the conveying of workpieces along the preset direction. The plurality of conveying units comprise a first conveying unit located in the printing area. The driving assembly is connected to the first conveying unit and can drive the first conveying unit to move away from the printing area along the horizontal direction when the nozzles perform flash printing.

[0007] The printing device has at least the following beneficial effects: in the printing device, the workpiece can be conveyed into the printing area by the cooperation of the conveying units of the conveying module, and the workpiece is printed by the printing module; when the printing module needs to be cleaned, the first conveying unit is driven to be separated from the printing area by the driving assembly; at this time, the nozzles in the printing module can be flashed to realize the conduction of the nozzles, so as to prevent the nozzles from being blocked; when the printing device works, the nozzles of the printing module are flashed at intervals, so that the nozzles can be kept in conduction, and the staff does not need to move the entire printing module to clean the nozzles manually.

[0008] According to the printing device of the first aspect of the present application, the first conveying unit comprises a first conveying structure and a first adsorption structure, the first conveying structure comprises a first conveying belt, the first conveying belt is provided with a first adsorption hole, the first adsorption structure is provided with a vacuum cavity, the upper end of the first adsorption structure is provided with a bearing surface, the bearing surface is provided with a vacuum suction hole, the first conveying belt is borne on the bearing surface, and at least one set of first adsorption holes and vacuum suction holes are in communication.

[0009] According to the printing device of the first aspect of the present application, the plurality of conveying units further comprise a second conveying unit, the second conveying unit is arranged adjacent to the first conveying unit, the second conveying unit comprises a second conveying structure and a second adsorption structure, the second conveying structure has a conveying surface for conveying the workpiece to move in a preset direction, and the lower side of the second conveying structure is provided with a containing area for containing the first conveying unit, the second adsorption structure is used for adsorbing the upper surface of the workpiece on the conveying surface; the driving assembly can drive the first conveying unit to separate from the printing area along the preset direction and move to the containing area.

[0010] According to the printing device of the first aspect of the present application, the second conveying structure comprises a plurality of conveying wheels arranged in an array, and the lower cut surfaces of the plurality of conveying wheels jointly form the conveying surface.

[0011] According to the printing device of the first aspect of the present application, the second adsorption structure comprises a vacuum cavity, the lower cavity wall of the vacuum cavity is provided with a plurality of second adsorption holes corresponding to the conveying wheels, the conveying wheels are arranged in the vacuum cavity, and the lower ends of the conveying wheels pass through the corresponding second adsorption holes and extend to the outside of the vacuum cavity.

[0012] According to the printing device of the first aspect of the present application, the second conveying structure further comprises a guide wheel, the guide wheel is located at the tail end of the second conveying unit, and the horizontal lower cut surface of the guide wheel is located at the horizontal lower side of the conveying surface.

[0013] The inkjet printing device according to an embodiment of the first aspect of the present application further comprises a waste collecting module, the waste collecting module comprises a waste tank, the waste tank is arranged in the inkjet printing area and is located at the lower side of the first conveying unit in the horizontal direction, and the waste tank is used for receiving the ink jetted by the inkjet printing module.

[0014] The inkjet printing device according to an embodiment of the first aspect of the present application further comprises a lifting assembly, the lifting assembly is connected with the waste tank and is used for driving the waste tank to perform lifting movement.

[0015] The self-cleaning method of the inkjet printing device according to an embodiment of the second aspect of the present application comprises the following steps.

[0016] It is determined that the inkjet printing module needs to be cleaned.

[0017] The first conveying unit is driven to be separated from the inkjet printing area.

[0018] The inkjet printing module is driven to perform flash jetting, so that all the nozzles of the inkjet printing module perform ink jetting.

[0019] The self-cleaning method of the inkjet printing device according to an embodiment of the second aspect of the present application further comprises the following step before the inkjet printing module is driven to perform flash jetting.

[0020] The waste tank is driven to move upward and approach the inkjet printing module.

[0021] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 FIG. 1 is a structural schematic diagram of an inkjet printing device according to an embodiment of the present application;

[0024] Figure 2 FIG. 2 is a structural schematic diagram of a conveying module of the inkjet printing device shown in FIG. 1; Figure 1

[0025] Figure 3 Figure 2

[0026] Figure 4 Figure 2

[0027] Figure 5 Figure 2

[0028] Figure 6 ​​​​​​​For Figure 1 Structure diagram of waste collecting module of the inkjet printing equipment shown in the figure.

[0029] Figure 7 Flow chart of the self-cleaning method of the inkjet printing equipment of one embodiment of the present application.

[0030] Reference signs:

[0031] Inkjet printing module 100;

[0032] Conveying module 200; containing area 201; driving assembly 210; first motor 211; mounting seat 212; transmission belt 213; first conveying unit 220; first conveying belt 221; first suction hole 221a; first suction structure 222; bearing surface 222a; vacuum suction hole 222b; conveying roller 223; second conveying unit 230; conveying wheel 231; second suction hole 232; guide wheel 233; third conveying unit 240; third conveying structure 241; second conveying belt 241a; third motor 241b; conveying frame 241c; third suction hole 241d; bearing frame 242; base 243; guide rail 243a;

[0033] Waste collecting module 300; waste groove 310; lifting assembly 320; second motor 321; worm 322. DETAILED DESCRIPTION

[0034] This part will describe the specific embodiments of the present application in detail, the preferred embodiments of the present application are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as the limitation of the protection scope of the present application.

[0035] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the present application.

[0036] In the description of the present application, several meanings are one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are not included in the number, above, below, etc. are understood to include the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0037] In the description of the present application, the words such as arrangement, installation, connection and the like should be understood in a broad sense, and the specific meanings of the words in the present application can be determined by the person skilled in the art in combination with the specific content of the technical solution, unless otherwise explicitly limited.

[0038] The following description of the present application will be made with reference to Figures 1 to 6 The first aspect of the present application is described in detail.

[0039] Reference Figure 1 According to the first aspect of the present application, the inkjet printing device comprises a printing module 100 and a conveying module 200. The printing module 100 is arranged below the printing area and comprises a nozzle for inkjet printing. The conveying module 200 comprises a driving assembly 210 and a plurality of conveying units. The plurality of conveying units are arranged along a preset direction and are used to cooperate with the conveying of the workpiece along the preset direction. The plurality of conveying units comprise a first conveying unit 220 located in the printing area. The driving assembly 210 is connected to the first conveying unit 220 and can drive the first conveying unit 220 to move horizontally away from the printing area when the nozzle performs flash printing.

[0040] Further, during the operation of the inkjet printing device in the present embodiment, when the printing module 100 needs to be cleaned, the driving assembly 210 can drive the first conveying unit 220 to move horizontally away from the printing area. At this time, the first conveying unit 220 is separated from the printing area, and the printing module 100 can be normally cleaned. When the printing module 100 is cleaned, ink will drip in the printing area. Since the first conveying unit 220 is located on the horizontal side of the printing area, the probability of ink dripping on the first conveying unit 220 can be reduced, thereby reducing the influence of the printing module 100 on the conveying module 200 during cleaning.

[0041] It can be understood that when the printing module 100 needs to be cleaned, the driving assembly 210 can drive the first conveying unit 220 to move horizontally to one side of the printing area. At this time, the printing module 100 can be normally cleaned. Since the printing module 100 does not need to be moved as a whole to the horizontal side of the conveying module 200 during cleaning, the cleaning of the printing module 100 is more convenient. At the same time, since the printing module 100 does not need to be moved as a whole to the horizontal side of the conveying module 200, the space occupied by the entire inkjet printing device during use can be smaller.

[0042] It can be understood that the flash ejection is performed through the nozzle to realize the unclogging of the nozzle, when the nozzle performs the flash ejection, the driving assembly 210 can drive the first conveying unit 220 to move away from the inkjet area in the horizontal direction, on the one hand, the ink consumed when the nozzle performs the flash ejection is less, and the waste of ink is less compared with the cleaning of the moving nozzle, on the other hand, when the nozzle performs the flash ejection, the first conveying unit 220 moves away from the inkjet area under the driving of the driving assembly 210, so that the protection of the first conveying unit 220 can be realized, the influence of the ink generated in the flash ejection of the nozzle on the first conveying unit 220 is reduced, the pollution of the ink generated in the flash ejection of the nozzle on the first conveying unit 220 is reduced, and the secondary pollution of the paper caused by the adhesion of the ink on the first conveying unit 220 is avoided.

[0043] It can be understood that when the nozzle performs the flash ejection, the nozzle does not need to move, so that the influence on the positioning accuracy of the nozzle itself can be reduced.

[0044] In some embodiments of the present application, the inkjet device further comprises a timing module, the timing module is electrically connected with the inkjet module 100, and can control each nozzle in the inkjet module 100 to perform flash ejection every certain time.

[0045] It can be understood that in the inkjet device of the present application, the timing module is arranged to perform timing flash ejection on the nozzles in the inkjet module 100, after the inkjet module 100 works for a certain time, all the nozzles in the inkjet module 100 can perform flash ejection to realize the conduction of each nozzle, so that the nozzles remain conductive in the future for a certain time, thereby reducing the probability of blockage in the nozzles, so that the nozzles are not easy to be blocked, to realize the prevention of the blockage of the nozzles, and the staff does not need to clean the nozzles frequently, thereby reducing the waste of ink; at the same time, according to the different inks used by the inkjet module 100, the staff can correspondingly adjust the time interval between the two flash ejections of the inkjet module 100.

[0046] In some embodiments of the present application, referring to Figure 3 The first conveying unit 220 comprises a first conveying structure and a first adsorption structure 222, the first conveying structure comprises a first conveying belt 221, the first conveying belt 221 is provided with a first adsorption hole 221a, the first adsorption structure 222 is formed with a vacuum cavity, the upper end of the first adsorption structure 222 is formed with a bearing surface 222a, the bearing surface 222a is provided with a vacuum suction hole 222b, the first conveying belt 221 is borne on the bearing surface 222a, and at least one set of the first adsorption hole 221a and the vacuum suction hole 222b are connected.

[0047] It should be noted that the printing device of the present application is used for printing on paper. When the paper is conveyed by the first conveying unit 220, the paper is carried on the first conveying belt 221. However, due to the light weight of the paper, the paper is easily affected by air resistance during the movement following the first conveying belt 221, so that the paper is deviated, and then the subsequent printing module 100 affects the printing on the paper on the first conveying belt 221.

[0048] It can be understood that, by arranging the first suction hole 221a on the first conveying belt 221, the vacuum suction hole 222b on the first suction structure 222 can suction the paper on the first conveying belt 221 through the first suction hole 221a during the movement of the paper driven by the first conveying belt 221, so that the paper can be stably attached to the surface of the first conveying belt 221, and then the first conveying belt 221 can accurately drive the paper to move.

[0049] In further embodiments of the present application, referring to Figure 3 , the first conveying structure further comprises two conveying rollers 223 arranged side by side, the first conveying belt 221 is annular, and the first conveying belt 221 is wound on the two conveying rollers 223, respectively, so that the first conveying belt 221 can drive the paper to move in a predetermined direction under the drive of the conveying rollers 223; the first suction structure 222 is arranged on the inner ring of the annular first conveying belt 221, and the carrying surface 222a of the first suction structure 222 is attached to the upper section of the first conveying belt 221.

[0050] In some embodiments of the present application, referring to Figure 3 , the drive assembly 210 comprises a first motor 211, a mounting seat 212, and a transmission belt 213. The mounting seat 212 is provided with front and rear extending slide rails, and the first conveying unit 220 is slidably arranged on the slide rails. The first motor 211 is in transmission connection with the first conveying unit 220 through the transmission belt 213. Under the drive of the first motor 211, the transmission belt 213 drives the first conveying unit 220 to slide along the slide rails to extend into or out of the printing area.

[0051] In some embodiments of the present application, the plurality of conveying units further comprises a second conveying unit 230, which is arranged adjacent to the first conveying unit 220. The second conveying unit 230 comprises a second conveying structure and a second suction structure. The second conveying structure has a conveying surface for conveying the workpiece to move in a predetermined direction, and the lower side of the second conveying structure forms a containing area 201 for containing the first conveying unit 220. The second suction structure is used for suctioning the upper surface of the workpiece on the conveying surface. The drive assembly 210 can drive the first conveying unit 220 to move out of the printing area and to the containing area 201 in the predetermined direction.

[0052] For example, as Figure 2As shown, the preset direction is the front-rear direction, the second conveying unit 230 is arranged adjacent to the first conveying unit 220, and the second conveying unit 230 is located at the front side of the first conveying unit 220 and is used to convey the paper to the first conveying unit 220; the second conveying unit 230 comprises a second conveying structure and a second adsorption structure, the lower end surface of the second conveying structure is formed with a conveying surface extending in the front-rear direction, the second adsorption structure is used to adsorb the upper surface of the paper on the conveying surface, and the lower side of the second conveying structure is formed with an accommodation area 201 used to accommodate the first conveying unit 220.

[0053] It can be understood that, by forming the conveying surface at the lower end of the second conveying structure and adsorbing the paper on the conveying surface by the second adsorption structure, on the one hand, the second conveying unit 230 can normally convey the paper to the first conveying unit 220, and on the other hand, the space below the second conveying structure can be fully utilized to form the accommodation area 201, so that the accommodation area 201 can be large enough to accommodate the first conveying unit 220.

[0054] It can be understood that, by forming the accommodation area 201 used to accommodate the first conveying unit 220 below the second conveying structure, the space below the second conveying structure can be fully utilized to reduce the occupied space of the whole inkjet printing device and make the whole structure of the inkjet printing device more compact.

[0055] In some embodiments of the present application, with reference to Figure 4 , the second conveying structure comprises a plurality of conveying wheels 231 arranged in an array, and the lower cut surfaces of the plurality of conveying wheels 231 collectively form the conveying surface.

[0056] It can be understood that, when the conveying wheels 231 rotate, the conveying wheels 231 can drive the paper to move along the conveying surface, so that the paper moves to the first conveying unit 220.

[0057] It should be noted that, if the second conveying structure uses a conveying belt to convey the paper, the paper is easy to be adsorbed on the conveying belt during the movement of the paper driven by the conveying belt 213, so that the paper is difficult to be smoothly conveyed from the second conveying unit 230 to the first conveying unit 220.

[0058] It can be understood that, by conveying the paper by the conveying wheels 231, the paper and the conveying wheels 231 are in line contact, so that the paper can be more easily separated from the conveying wheels 231, and the second conveying unit 230 can more smoothly and stably convey the paper to the first conveying unit 220.

[0059] In order to enable the upper surface of the paper to be stably attached to the conveying surface during the conveying of the paper by the conveying wheel 231, in a further embodiment of the present application, the second suction structure comprises a vacuum cavity, a lower cavity wall of the vacuum cavity is provided with a plurality of second suction holes 232 corresponding to the conveying wheel 231, the conveying wheel 231 is arranged in the vacuum cavity, and the lower end of the conveying wheel 231 passes through the corresponding second suction hole 232 and extends to the outside of the vacuum cavity.

[0060] It can be understood that, under the vacuum action of the vacuum cavity, the upper end region of the paper forms a negative pressure, so that the paper can be stably attached to the wheel surface of the conveying wheel 231, and at the same time, due to the abutting action of the conveying wheel 231, the paper will not be attached to the outer cavity wall of the vacuum cavity, that is, the paper will not close the second suction hole 232, so that the paper can be kept in abutment with the wheel surface of the conveying wheel 231, and at the same time, the upward suction force on the paper will not be too large, so as to facilitate the subsequent paper to be smoothly and stably conveyed from the second conveying unit 230 to the first conveying unit 220.

[0061] In some embodiments of the present application, the second conveying structure further comprises a guide wheel 233, the guide wheel 233 is located at the tail end of the second conveying unit 230, and the horizontal lower section of the guide wheel 233 is located at the horizontal lower side of the conveying surface.

[0062] For example, as shown in Figure 4 the rear end of the second conveying structure is provided with a guide wheel 233, and the horizontal lower section of the guide wheel 233 is located at the horizontal lower side of the conveying surface.

[0063] It should be noted that the second conveying structure is located at the horizontal upper side of the first conveying structure, so that during the conveying of the paper on the second conveying unit 230 to the first conveying unit 220, the paper needs to move not only in the front-rear direction but also in the vertical direction. During the rearward movement of the second conveying structure conveying the paper, as more and more parts of the paper are separated from the second conveying structure, the paper will gradually bend downward under the action of its own gravity to contact the conveying belt of the first conveying unit 220. Due to the light weight of the paper, the paper will only sag to contact the conveying belt of the first conveying unit 220 after most of the paper is separated from the second conveying structure, that is, after the paper is completely separated from the second conveying structure, only part of the paper will be attached to the conveying belt of the first conveying unit 220, and the remaining part of the paper will suddenly accelerate downward to approach the conveying belt of the first conveying unit 220 under the action of gravity and its own elasticity. During this process, under the action of air resistance, the paper is prone to deviation, thereby affecting the printing accuracy of the subsequent printing module 100 on the paper.

[0064] It can be understood that by arranging the guide wheel 233 and the horizontal lower side of the guide wheel 233 is located at the lower side of the conveying surface, so that when the conveying wheel 231 drives the paper to move to the guide wheel 233, the paper can move downward under the guidance of the guide wheel 233, so that the paper can more quickly contact and fit on the conveying belt of the first conveying unit 220, and when the paper completely separates from the second conveying structure, the paper can have more parts fit the belt surface of the conveying belt, and in the process of fitting the remaining part of the paper to the conveying belt of the first conveying unit 220, the paper can be more stably fitted on the conveying belt of the first conveying unit 220, so as to reduce the deviation of the paper and enable the subsequent inkjet module 100 to more accurately complete the inkjet on the paper.

[0065] In some embodiments of the present application, referring to Figure 1 The inkjet device further comprises a waste collecting module 300, and the waste collecting module 300 comprises a waste tank 310, which is arranged in the inkjet area and located at the lower side of the first conveying unit 220, and is used to receive the ink jetted by the inkjet module 100.

[0066] It should be noted that the inkjet module 100 comprises a plurality of inkjet heads arranged in an array, each of which can independently jet ink, and when the inkjet module 100 is working, not all inkjet heads will work, and some inkjet heads will be blocked due to dry ink after a long time of non-use. When cleaning the inkjet module 100, the inkjet module 100 needs to be flash jetted so that all inkjet heads of the inkjet module 100 can jet ink at a higher power, so that the high-pressure ink can flush open the blocked inkjet heads.

[0067] It can be understood that when the inkjet module 100 is cleaned, the inkjet module 100 will be flash jetted,

[0068] In this process, the inkjet module 100 will jet ink, and by arranging the waste tank 310 in the inkjet area, the ink jetted by the inkjet module 100 can be collected in the waste tank 310, so as to reduce the pollution of the ink jetted by the inkjet module 100 to other structures of the inkjet device.

[0069] It should be noted that because the waste tank 310 and the inkjet module 100 need to accommodate the first conveying unit 220, the distance between the inkjet module 100 and the waste tank 310 is large, and accordingly, when the inkjet module 100 is flash jetted, there is a problem that more ink is not jetted into the waste tank 310.

[0070] In further embodiments of the present application, referring to Figure 6The waste collecting module 300 further comprises a lifting assembly 320 connected with the waste tank 310 and configured to drive the waste tank 310 to move up and down.

[0071] It can be understood that when the inkjet module 100 needs to be cleaned, the driving assembly 210 drives the first conveying unit to move away from the inkjet area in the horizontal direction, then the lifting assembly 320 drives the waste tank 310 to move up to be close to the inkjet module 100, and then the inkjet module 100 performs flash jetting; since the lifting assembly 320 can drive the waste tank 310 to move up to be close to the inkjet module 100 when the inkjet module 100 is cleaned, the ink jetted by the inkjet module 100 can be more fully collected in the waste tank 310, so as to reduce the pollution of the ink jetted by the inkjet module 100 to other structures of the inkjet device.

[0072] In the embodiments of the present application, referring to Figure 6 The lifting assembly 320 comprises a second motor 321, a turbine and a worm 322, the worm 322 extends in the vertical direction, the second motor 321 is connected with the turbine, the turbine is engaged with the worm 322, the worm 322 is slidably arranged in the vertical direction and connected with the waste tank 310, under the driving of the second motor 321, the turbine can drive the worm 322 to move up and down, so that the worm 322 can drive the waste tank 310 to move up and down.

[0073] In some embodiments of the present application, referring to Figure 1 and Figure 2 The plurality of conveying units further comprises a third conveying unit 240, the third conveying unit 240 is arranged adjacent to the first conveying unit 220 and located at the rear side of the first conveying unit 220, and the third conveying unit 240 is configured to receive the paper output by the first conveying unit 220; the third conveying unit 240 comprises two third conveying structures 241 and a supporting frame 242, the two third conveying structures 241 are spaced apart in the left-right direction and configured to cooperate to convey the paper to move from front to back, and the supporting frame 242 is arranged between the two third conveying structures 241 and configured to support the middle part of the paper.

[0074] It can be understood that by arranging the supporting frame 242, the two third conveying structures 241 can support the middle part of the paper during the cooperation of conveying the paper, so as to improve the stability of the paper moving conveyed by the third conveying structure 241.

[0075] In further embodiments of the present application, referring to Figure 6The third conveying structure 241 comprises a second conveying belt 241a, a third motor 241b and a conveying frame 241c, the conveying frame 241c is provided with a horizontally extending support surface provided with vacuum holes, the second conveying belt 241a is provided with third suction holes 241d, the second conveying belt 241a is carried on the support surface, the third motor 241b is in transmission connection with the second conveying belt 241a and is used to drive the second conveying belt 241a to move the paper from front to back, and in the process of conveying the paper by the second conveying belt 241a, the vacuum holes suction the paper through the third suction holes 241d, so that the paper is more firmly attached to the belt surface of the second conveying belt 241a.

[0076] In further embodiments of the present application, reference is made to Figure 6 The third conveying unit 240 further comprises a base 243 provided with left and right extending guide rails 243a, and the conveying frame 241c is slidably arranged on the guide rails 243a.

[0077] It can be understood that the staff can adjust the relative distance between the two third conveying units 240 according to the size of the paper, so that the third conveying unit 240 can convey paper of different widths.

[0078] In the following, reference is made to Figure 7 The self-cleaning method of the inkjet printing device according to the second aspect of the present application is described in detail.

[0079] The self-cleaning method of the inkjet printing device according to the second aspect of the present application comprises but is not limited to the following steps:

[0080] Step S100, judging whether the inkjet printing module 100 needs to be cleaned;

[0081] Step S200, driving the first conveying unit 220 to separate from the inkjet printing area;

[0082] Step S400, driving the inkjet printing module 100 to perform flash printing, so that all nozzles of the inkjet printing module 100 perform inkjet.

[0083] It should be noted that the inkjet printing module 100 is relatively large, and a plurality of inkjet heads are arranged in the inkjet printing module 100, each inkjet head can independently jet ink, but when the inkjet printing module 100 works, due to the shape of the pattern to be printed, only part of the inkjet heads in the inkjet printing module 100 will jet ink, and the ink in some inkjet heads which have not been used for a long time will dry, thereby clogging the inkjet heads and affecting the normal work of the inkjet printing module 100. Therefore, after the inkjet printing module 100 works for a period of time, the inkjet printing module 100 needs to be cleaned to unblock the clogged inkjet heads in the inkjet printing module 100.

[0084] It can be understood that when the inkjet module 100 needs to be cleaned, the first conveying unit 220 is first driven to move away from the inkjet area, and the inkjet module 100 is driven to perform a flash jet, so that the ink generated when the inkjet module 100 performs the flash jet does not pollute the first conveying unit 220. At the same time, by moving the first conveying unit 220 out of the inkjet area, the entire inkjet module 100 does not need to be moved, saving time and effort.

[0085] It can be understood that by performing a flash jet on the inkjet module 100, all the nozzles of the inkjet module 100 are jetted with ink, which can flush out the dried ink in the inkjet head, thereby completing the cleaning of the inkjet head. The cleaning process of the inkjet head is simpler and more convenient.

[0086] In some embodiments of the present application, with reference to Figure 7 Between steps S400, the following steps are further included, but are not limited to:

[0087] Step S300, driving the waste tank 310 to move upward and close to the inkjet module 100.

[0088] It can be understood that by driving the waste tank 310 to move upward and close to the inkjet module 100, the ink jetted by the inkjet module 100 can be more smoothly collected in the waste tank 310.

[0089] In some embodiments of the present application, in step S100, the following steps are included, but are not limited to:

[0090] Step S110, determining whether the inkjet module 100 has been flashed for a preset time interval since the last flash.

[0091] Step S120, if the inkjet module 100 has been flashed for a preset time interval since the last flash, determining that the inkjet module 100 needs to be cleaned.

[0092] It can be understood that after the inkjet module 100 works for a certain period of time, some of the nozzles in the inkjet module 100 will be blocked to varying degrees. By performing a flash jet on the inkjet module 100 at regular intervals, the nozzles can be turned on in time to ensure the normal operation of the inkjet module 100. At the same time, according to the different inks used by the inkjet module 100, the size of the preset time interval can be adjusted accordingly.

[0093] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A jet printing apparatus characterized by comprising: The application relates to a printing device, which comprises the following parts: a printing module, which is arranged below a printing area and comprises nozzles for ink jetting; a conveying module, which comprises a driving assembly and a plurality of conveying units arranged along a preset direction and used for moving workpieces along the preset direction, wherein the conveying units comprise a first conveying unit located in the printing area, and the driving assembly is connected with the first conveying unit and can drive the first conveying unit to move away from the printing area along a horizontal direction when the nozzles are jetting.

2. A drop-on-demand apparatus as claimed in claim 1, wherein The first conveying unit comprises a first conveying structure and a first adsorption structure, the first conveying structure comprises a first conveying belt, the first conveying belt is provided with first adsorption holes, the first adsorption structure is provided with a vacuum cavity, the upper end of the first adsorption structure is provided with a bearing surface, the bearing surface is provided with vacuum suction holes, the first conveying belt is borne on the bearing surface, and at least one group of the first adsorption holes and the vacuum suction holes are connected.

3. The apparatus of claim 1, wherein The conveying units further comprise a second conveying unit, the second conveying unit is arranged adjacent to the first conveying unit, the second conveying unit comprises a second conveying structure and a second adsorption structure, the second conveying structure is provided with a conveying surface for moving workpieces along the preset direction, the lower side of the second conveying structure is provided with a containing area for containing the first conveying unit, and the second adsorption structure is used for adsorbing the upper surface of the workpiece on the conveying surface; and the driving assembly can drive the first conveying unit to move away from the printing area along the preset direction and to the containing area.

4. A drop-on-demand apparatus as claimed in claim 3, wherein The second conveying structure comprises a plurality of conveying wheels arranged in an array, and the lower cut surfaces of the conveying wheels jointly form the conveying surface.

5. A drop-on-demand apparatus as claimed in claim 4, wherein The second adsorption structure comprises a vacuum cavity, the lower cavity wall of the vacuum cavity is provided with a plurality of second adsorption holes corresponding to the conveying wheels, the conveying wheels are arranged in the vacuum cavity, and the lower ends of the conveying wheels pass through the corresponding second adsorption holes and extend to the outside of the vacuum cavity.

6. The apparatus of claim 4 wherein, The second conveying structure further comprises a guide wheel, the guide wheel is located at the tail end of the second conveying unit, and the horizontal lower cut surface of the guide wheel is located at the horizontal lower side of the conveying surface.

7. The apparatus of claim 1, wherein The application further comprises a waste collecting module, the waste collecting module comprises a waste tank, the waste tank is arranged in the printing area and located at the horizontal lower side of the first conveying unit, and the waste tank is used for receiving the ink jetted by the printing module.

8. A drop-on-demand apparatus as claimed in claim 7, wherein The waste collecting module further comprises a lifting assembly, the lifting assembly is connected with the waste tank and used for driving the waste tank to move up and down.

9. A self-cleaning method of a jet printing apparatus, characterized by, The application further comprises the following steps: judging whether the printing module needs to be cleaned; driving the first conveying unit to move away from the printing area; driving the printing module to jet ink, so that all the nozzles of the printing module jet ink.

10. The method of claim 9, wherein the method further comprises: Before the step of driving the printing module to jet ink, the following step is further included: driving the waste tank to move up and approach the printing module.

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