Inkjet device

Abstract

The present disclosure relates to a jet printing device. The jet printing device comprises a support configured to define a jet printing station and a plurality of maintenance stations; a transversal drive unit arranged on the support and configured to drive a jet printing unit along a transversal direction to reach the jet printing station or a maintenance station, the transversal direction being perpendicular to a conveying direction of an object to be jet printed; at least one jet printing unit connected to the drive unit for jet printing the object to be jet printed; a jet printing cover arranged at the jet printing station and configured to define a jet printing cavity; and a suction unit arranged at the jet printing station, a gap between an upper edge of the suction unit and a lower edge of the jet printing cover being configured to allow the object to be jet printed to pass through. The jet printing device provides convenience for maintenance of the jet printing unit.

Description

Technical Field

[0001] This disclosure relates generally to inkjet printing technology, and more specifically, to inkjet printing equipment. Background Technology

[0002] Inkjet printing equipment is used to print on target objects. Target objects can be various materials, such as fabric, glass, metal, wood, and silicon wafers. After use, inkjet printing equipment requires maintenance to ensure its optimal performance and guarantee printing results.

[0003] In traditional inkjet printing equipment, maintaining the equipment, such as the printhead, often presents many inconveniences. Summary of the Invention

[0004] This disclosure provides a printing apparatus that facilitates the maintenance of the printing unit.

[0005] According to one aspect of this disclosure, a printing apparatus is provided. The printing apparatus includes: a support frame configured to define a printing station and a plurality of maintenance stations; a lateral drive unit disposed on the support frame and configured to drive printing units to move laterally to reach the printing station or maintenance station, the lateral movement being perpendicular to the conveying direction of the object to be printed; at least one printing unit connected to the drive unit for printing on the object to be printed; a printing hood disposed at the printing station and configured to define a printing cavity; and a suction unit disposed at the printing station, wherein a gap is configured between the upper edge of the suction unit and the lower edge of the printing hood for the object to be printed to pass through.

[0006] In some embodiments, the printing apparatus further includes: a longitudinal drive unit disposed on a transverse drive unit, for driving the printing unit to move longitudinally so that the printhead of the printing unit enters the printing cavity, wherein the longitudinal direction is perpendicular to the plane of the object to be printed.

[0007] In some embodiments, the air intake unit includes an air intake duct, a fan, and at least one of the following: an electric field adsorption purification mechanism; a mechanical adsorption purification mechanism; and a vapor-water separation mechanism.

[0008] In some embodiments, the printing unit includes: a printhead mounting plate connected to a longitudinal drive unit; and a printhead disposed on the printhead mounting plate; the bracket includes: a locking unit disposed at a maintenance station, configured to lock the printhead mounting plate in a first state and unlock the printhead mounting plate in a second state.

[0009] In some embodiments, the locking unit includes two locking plates respectively disposed at both ends of the nozzle mounting plate, and the locking plates are provided with screw holes so as to lock the locking plates to the nozzle mounting plate by bolts.

[0010] In some embodiments, the nozzle mounting plate includes a first nozzle mounting plate and a second nozzle mounting plate arranged in parallel, with nozzles on the first nozzle mounting plate and nozzles on the second nozzle mounting plate arranged opposite to each other; the locking unit includes a first locking unit and a second locking unit, the first locking unit being configured to lock the first nozzle mounting plate in a first state and unlock the first nozzle mounting plate in a second state, and the second locking unit being configured to lock the second nozzle mounting plate in the first state and unlock the second nozzle mounting plate in the second state.

[0011] In some embodiments, a flow guiding mechanism is provided inside the printing mask.

[0012] In some embodiments, the printhead includes: a nozzle configured to flow liquid to be printed; and a nozzle drive unit connected to the nozzle and configured to drive the nozzle under the control of a drive electrical signal so that the liquid to be atomized is ejected from the nozzle.

[0013] In some embodiments, the plurality of maintenance stations include: a first maintenance station and a second maintenance station; wherein the first maintenance station and the second maintenance station are disposed on a first side of the printing station, or the first maintenance station is disposed on a first side of the printing station and the second maintenance station is disposed on a second side of the printing station.

[0014] In some embodiments, at least one printing unit includes a first printing unit and a second printing unit; the lateral drive unit is further configured to drive the first printing unit to move laterally to reach the printing station or the first maintenance station, and to drive the second printing unit to move laterally to reach the printing station or the second maintenance station.

[0015] In some embodiments, the lateral drive unit includes: a first lateral drive unit configured to drive a first printing unit to move laterally to reach a printing station or a maintenance station; and a second lateral drive unit configured to drive a second printing unit to move laterally to reach a printing station or a maintenance station.

[0016] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify key or principal features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0017] Figure 1 A first-angle perspective view of a printing apparatus according to an embodiment of the present invention is shown.

[0018] Figure 2 A second perspective perspective view of a printing apparatus according to an embodiment of the present invention is shown.

[0019] Figure 3 A perspective view of a partial structure of a printing apparatus according to an embodiment of the present invention is shown.

[0020] Figure 4 It shows Figure 3 Enlarged schematic diagram of region A in the middle.

[0021] Figure 5 A schematic diagram of the structure of a nozzle according to an embodiment of the present invention is shown.

[0022] Figure 6 A schematic diagram of the structure of the inkjet printing mask according to an embodiment of the present invention is shown.

[0023] Figure 7 A perspective view of the suction unit according to an embodiment of the present invention is shown.

[0024] Figure 8 A side view schematic diagram of the suction unit according to an embodiment of the present invention is shown.

[0025] Figure 9 A perspective view of a partial structure of a printing apparatus according to an embodiment of the present invention is shown.

[0026] Figure 10 A perspective view of a longitudinal drive unit according to an embodiment of the present invention is shown.

[0027] Figure 11 A bottom view schematic diagram of a partial structure of a printing apparatus according to an embodiment of the present invention is shown.

[0028] Figure 12 A side sectional view of a partial structure of a printing apparatus according to an embodiment of the present invention is shown.

[0029] Figure 13 A third-angle perspective view of a printing apparatus according to an embodiment of the present invention is shown.

[0030] Figure 14 It shows Figure 13 A magnified view of region B in the middle.

[0031] Figure 15 A perspective view of a printing apparatus according to an embodiment of the present invention is shown.

[0032] In the various figures, the same or corresponding reference numerals indicate the same or corresponding parts. Detailed Implementation

[0033] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0034] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0035] As described above, in traditional inkjet printing equipment, there are often many inconveniences in maintaining the equipment, such as the printhead.

[0036] To at least partially address one or more of the aforementioned problems and other potential issues, exemplary embodiments of the present invention provide a printing apparatus. The apparatus has a support that defines a printing station and multiple maintenance stations. A lateral drive unit can drive the printing unit laterally to reach either the printing station or the maintenance station, thereby facilitating maintenance of the printing unit. Furthermore, a printing hood prevents the liquid to be printed ejected by the printing unit from spreading to the surrounding environment, reducing contamination. A suction unit removes the liquid to be printed ejected by the printing unit and dispersed into the air, further ensuring reduced contamination.

[0037] The following describes, with reference to the accompanying drawings, an exemplary embodiment of the inkjet printing apparatus of this disclosure. Figure 1 A first-angle perspective view of a printing apparatus 100 according to an embodiment of the present invention is shown. Figure 2 A second perspective view of a printing apparatus 100 according to an embodiment of the present invention is shown. For ease of explanation, the positive directions of the X-axis, Y-axis, and Z-axis are indicated by arrows in the figure. Figure 3 A perspective view of a partial structure of a printing apparatus 100 according to an embodiment of the present invention is shown. Figure 4 It shows Figure 3 Enlarged schematic diagram of region A in the middle.

[0038] The inkjet printing equipment 100 includes a support 102, a horizontal drive unit, a printing unit, a printing hood 202, and a suction unit 204. The horizontal drive unit includes, for example, a first horizontal drive unit 104 and a second horizontal drive unit 106. The printing unit includes, for example, a first printing unit 105 and a second printing unit 110. A first maintenance station 114 is located on a first side of the printing station 112, and a second maintenance station 116 is located on a second side of the printing station 112 opposite to the first side. The first maintenance station 114, the printing station 112, and the second maintenance station 116 are arranged sequentially, for example, along the length direction (e.g., the X-axis direction) of the inkjet printing equipment 100.

[0039] The bracket 102 is configured to define the printing station 112 and the maintenance station. The maintenance station includes, for example, a first maintenance station 114 and a second maintenance station 116.

[0040] A lateral drive unit is mounted on the bracket 102 and is configured to drive the printing unit to move laterally to reach the printing station or maintenance station. The printing unit is connected to the drive unit and is used to print on the object to be printed.

[0041] It is worth noting that the support 102 includes a crossbeam 122 and a column 124. A slide rail 126 is provided on the crossbeam 122. The slide rail 126 is, for example, located on the lower surface of the crossbeam 122. The drive unit includes a rack 128 and a gear 130. The rack 128 is arranged parallel to the slide rail 126. For example, the rack 128 is located between two slide rails 126. The gear 130 meshes with the rack 128, and the gear rotates under the drive of the first motor 132 to drive the printing unit to move laterally along the rack 128.

[0042] For example, the first lateral drive unit 104 drives the first printing unit 105 to move laterally to reach the printing station 112 or the first maintenance station 114. The second lateral drive unit 106 drives the second printing unit 110 to move laterally to reach the printing station 112 or the second maintenance station 116. In some embodiments, the first lateral drive unit 104 and the second lateral drive unit 106 share the same slide rail 126 and rack 128. The first lateral drive unit 104 and the second lateral drive unit 106 each have their own corresponding gear 130 and first motor 132, so as to drive the first printing unit 105 to move laterally to reach the printing station 112 or the first maintenance station 114, and drive the second printing unit 110 to move laterally to reach the printing station 112 or the second maintenance station 116, respectively.

[0043] This allows for full utilization of lateral (e.g., X-axis) space to accommodate printing and maintenance stations, resulting in more efficient space utilization. Furthermore, it allows for a narrower width (e.g., Y-axis) of the printing equipment, enabling the application of sufficient tension to the object to be printed 201 at the printing station, resulting in a flatter object and improved printing accuracy. It should be understood that the mechanisms for conveying the object to be printed 201 at the printing station include a rubber roller 134 and a pressure roller, among others.

[0044] In use, for example, the first printing unit 105 can be moved to the printing station 112 to print a liquid of a first color onto the object to be printed 201. This allows the second printing unit 110 to perform maintenance or preparatory work before printing at the second maintenance station 116. After the first printing unit 105 completes its printing task, it is moved to the first maintenance station 114, and the second printing unit 110 is moved to the printing station 112 to print a liquid of a second color onto the object to be printed 201, thereby improving printing efficiency.

[0045] The printing unit includes, for example, a printhead mounting plate 302 and a printhead 304. The printhead mounting plate 302 is connected to the longitudinal drive unit. The printhead 304 is mounted on the printhead mounting plate 302. Figure 5 A schematic diagram of a printhead 304 according to an embodiment of the present invention is shown. The printhead 304 includes, for example, a nozzle 342 and a nozzle drive unit 344. The nozzle 342 is configured to allow flow of liquid to be printed. The nozzle drive unit 344 is connected to the nozzle 342 and is configured to drive the nozzle 344 under the control of a drive electrical signal, so that the liquid to be atomized is ejected from the nozzle. The printing unit includes a plurality of printheads 304, which are arranged in an array on the printhead mounting plate 302.

[0046] The nozzle drive unit 344 includes a metal plate 346 and a piezoelectric material unit 348. The metal plate 346 includes a first through-hole 341 located at its center for mounting the nozzle 304. The diameter of the first through-hole 341 is, for example, 1 to 20 mm. The cross-section of the metal plate is, for example, but not limited to, a polygon, a circle, or an ellipse. The diameter of the inscribed circle of the metal plate is, for example, 10 to 65 mm.

[0047] The nozzle 342 is used to circulate the liquid to be printed. The nozzle 342 is positioned at the edge of the metal plate 346. One end of the nozzle 342 is a tip, and the other end communicates with an ink cartridge (not shown) for containing the liquid to be printed. It should be understood that if the tip angle is too large, the output capacity of the liquid to be printed ejected through the tip will decrease; if the tip angle is too small, it is prone to bending. In some embodiments, the tip angle of the nozzle 342 is 15° to 30°. This balances the output capacity of the liquid to be printed and the rigidity of the tip. It should be understood that a nozzle 342 that is too short is inconvenient for installation, while a nozzle 342 that is too long will increase the flow resistance of the liquid to be printed as it flows through the nozzle. In some embodiments, the length of the nozzle 342 is, for example, 15 to 100 mm, which facilitates installation and avoids excessive flow resistance.

[0048] The piezoelectric material unit 348 is disposed on the first side of a metal plate and is used to drive the metal plate to move under the control of a driving electrical signal, thereby causing the liquid to be printed to be sprayed out from the nozzle 342. The piezoelectric material unit 348 includes a second through-hole 343 for mounting the piezoelectric material unit 348 and a coating material 345. The second through-hole 343 is disposed at the center of the piezoelectric material unit 348. The coating material 345 is disposed on the surface of the piezoelectric material unit 348. The coating material 345 is, for example, silver, and its thickness is, for example, 0.5–11 μm. In some embodiments, the piezoelectric material unit 348 is, for example, piezoelectric ceramic. In some embodiments, the first through-hole 341 and the second through-hole 343 are concentric, and the diameter of the first through-hole 341 is smaller than the diameter of the second through-hole 343.

[0049] One of the positive and negative terminals of the driving electrical signal (e.g., the negative terminal) is applied to the second side of the metal plate, while the other (e.g., the positive terminal) is applied to the coating material 345 of the piezoelectric material unit 348 via a flexible electrode. An electric field is applied to the piezoelectric material unit 348 by the driving electrical signal, causing it to deform mechanically and move the metal plate 346. The metal plate 346 then moves the nozzle 342, causing the liquid to be printed to be ejected from the nozzle. The thickness, length, or volume deformation of the piezoelectric material unit 348 varies under different driving electrical signals, resulting in different liquid ejection effects from the nozzle 342. Therefore, the flow rate of the fluid and the state of the ejected liquid (e.g., the negative terminal) can be controlled by adjusting the driving electrical signal. For example, by adjusting the driving electrical signal, the movement trajectory of the nozzle can be changed, causing the liquid to be printed to be ejected under the high-speed vibration of the nozzle, forming a mist to complete the printing task.

[0050] Figure 6A schematic diagram of the structure of a printing hood 202 according to an embodiment of the present invention is shown. The printing hood 202 is disposed at the printing station 112. The printing hood 202 is configured to define a printing cavity. The printing hood 202 includes, for example, a support member 221, side walls 223, and a top wall 224. The support member 221 is supported on a suction unit 204. The support member 221 includes, for example, a window, and a sealing wall 222 is disposed in the window of the support member 221. The sealing wall 222 is, for example, made of a transparent material to allow observation of the printing operation through the window. Both the side walls 223 and the top wall 224 are disposed on the support member 221. There are two side walls 223 and two top walls 224. A gap 225 is formed between the two top walls 224 to allow the printhead 304 of the printing unit to enter the printing cavity. The printing cavity is defined by the side walls 223, the top wall 224, and the sealing wall 222.

[0051] The inkjet printing hood 202 is provided with an air guiding mechanism 226. The air guiding mechanism 226 is, for example, an air guiding groove provided along the side wall 223 and the top wall 224. When the suction unit 204 is working, the air guiding mechanism 226 allows air to enter from the gap 225, and after passing through the air guiding mechanism 226, flow towards the suction unit 204 located below the inkjet printing hood 202.

[0052] Figure 7 A schematic diagram of the structure of the suction unit 204 according to an embodiment of the present invention is shown. Figure 8 A side view of the suction unit 204 according to an embodiment of the present invention is shown. For ease of explanation, some external structures are omitted to show the internal structure. The suction unit 204 is disposed at the printing station 112, and a gap is configured between the upper edge of the suction unit 204 and the lower edge of the printing hood 202 (e.g., the lower edge of the side wall 223 of the printing hood 202) for the object 201 to be printed to pass through. The object 201 to be printed is conveyed, for example, along the Y-axis direction.

[0053] The air intake unit includes, for example, an air intake duct, a fan, and at least one of an electric field adsorption purification mechanism, a mechanical adsorption purification mechanism, and a vapor-liquid separation mechanism. The electric field adsorption purification mechanism includes, for example, an adsorption electric field region. The mechanical adsorption purification mechanism includes, for example, a filter screen.

[0054] In some embodiments, the suction unit 204 includes, for example, a suction slot 242 and a suction assembly 246. The suction slot 242 is disposed above and communicates with the suction assembly 246. The suction slot 242 includes, for example, multiple sidewalls, and the upper edge of the sidewalls is configured to form a gap between the lower edge of the printing hood 202 (e.g., the lower edge of the sidewall 223 of the printing hood 202) for the object 201 to be printed to pass through. A ventilation hole 244 is provided in the suction slot 242 and communicates with the suction assembly 246. The ventilation hole 244 is, for example, elongated.

[0055] The air intake assembly 246 includes a first filter 241, an adsorption electric field region 243, a second filter 243, and a fan 247. The first filter 241, the adsorption electric field region 243, the second filter 243, and the fan 247 are arranged sequentially according to the airflow direction. The adsorption electric field region 243 may be multi-stage, for example, with the multi-stage adsorption electric field regions 243 arranged sequentially.

[0056] During the printing operation, the suction unit 204 performs a suction operation from below the object to be printed 201, which can suck away the liquid to be printed that is sprayed out by the printing unit and dispersed in the air to avoid contamination.

[0057] Figure 9 A perspective view of a partial structure of a printing apparatus 100 according to an embodiment of the present invention is shown. Figure 10 A perspective view of a longitudinal drive unit 402 according to an embodiment of the present invention is shown. Figure 11 A bottom view schematic diagram of a partial structure of a printing apparatus 100 according to an embodiment of the present invention is shown. Figure 12 A side sectional view of a partial structure of a printing apparatus 100 according to an embodiment of the present invention is shown. It is worth noting that the printing apparatus 100 also includes a longitudinal drive unit 402. The longitudinal drive unit 402, disposed on the transverse drive unit, is used to drive the printing unit to move longitudinally so that the printhead 304 of the printing unit enters the printing cavity. This longitudinal direction is perpendicular to the plane of the object to be printed 201. This longitudinal direction is, for example, the direction corresponding to the Z-axis. The drive unit 402 includes a second motor 422, a drive shaft 424, and a lead screw 426. The second motor 422 drives the drive shaft 424, and the drive shaft 424 drives the lead screw 426 to rotate so as to drive the printing unit to move longitudinally.

[0058] At printing station 112, the printing unit can be driven longitudinally by the longitudinal drive unit 402 to reach a suitable height, for example, so that the lowest point of the printing unit is higher than the printing nozzle 202. Then, the printing unit is driven laterally by the transverse drive unit to reach printing station 112. During the movement, the height of the printing unit is suitable to avoid the printing nozzle 202. After reaching printing station 112, the printing unit can be driven longitudinally by the longitudinal drive unit 402 to lower the printing unit so that the printhead 304 of the printing unit can enter the printing cavity to perform the printing operation.

[0059] Figure 13 A third-angle perspective view of a printing apparatus according to an embodiment of the present invention is shown. Figure 14 It shows Figure 13An enlarged schematic diagram of area B in the middle section. It is worth noting that a locking unit 305 is provided at the maintenance station, configured to lock the nozzle mounting plate 302 in a first state and unlock the nozzle mounting plate 302 in a second state. The locking unit 305 includes two locking plates respectively disposed at both ends of the nozzle mounting plate 302. The locking plates are provided with screw holes 307 to lock the locking plates to the nozzle mounting plate 302 via bolts.

[0060] In some embodiments, the nozzle mounting plate 302 includes a first nozzle mounting plate and a second nozzle mounting plate arranged in parallel, with nozzles on the first nozzle mounting plate and nozzles on the second nozzle mounting plate positioned opposite each other. In this case, the distance between the nozzles on the first and second nozzle mounting plates is relatively short, making maintenance and replacement of the nozzles difficult. The locking unit 305 includes a first locking unit and a second locking unit. The first locking unit is configured to lock the first nozzle mounting plate in a first state and unlock it in a second state. The second locking unit is configured to lock the second nozzle mounting plate in the first state and unlock it in the second state.

[0061] At the maintenance station, the printing unit can be driven longitudinally by the longitudinal drive unit 402, for example, causing the printing unit to descend to match the height of the locking unit 305. Screw holes are provided at both ends of the printhead mounting plate 302. The locking unit 305 and the printhead mounting plate 302 can be locked together by bolts via the screw holes 307 on the locking unit 305 and the screw holes at both ends of the printhead mounting plate 302. For example, the first locking unit can be locked to the first printhead mounting plate. At this time, the first printhead mounting plate can be unlocked from the longitudinal drive unit 402. Then, the printing unit can be driven longitudinally by the longitudinal drive unit 402, for example, causing the printing unit to rise. At this time, the first printhead mounting plate and the printing unit separate, forming a certain space. This allows for convenient maintenance of the printhead mounted on the first printhead mounting plate.

[0062] Figure 15 A perspective view of a printing apparatus 500 according to an embodiment of the present invention is shown.

[0063] The first maintenance station 114 and the second maintenance station 116 are both located on the same side of the printing station. The printing station includes, for example, a first printing station 1121 and a second printing station 1122. The first maintenance station 114 and the first printing station 1121 are both defined by a first crossbeam 1221, and the second maintenance station 116 and the second printing station 1122 are both defined by a second crossbeam 1222. A first lateral drive unit is provided on the first crossbeam 1221 for driving the first printing unit 105 to move laterally to reach the first printing station 1121 or the first maintenance station 114. A second lateral drive unit is provided on the second crossbeam 1222 for driving the second printing unit 110 to move laterally to reach the second printing station 1122 or the second maintenance station 116. This allows the printing device 500 to have a shorter length and occupy less space laterally.

[0064] In use, for example, the first printing unit 105 can be used to print a liquid of a first color onto the object to be printed 201, and the second printing unit 110 can be used to print a liquid of a second color onto the object to be printed 201, so as to improve printing efficiency.

[0065] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0066] The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the various embodiments, or to enable those skilled in the art to understand the embodiments disclosed herein.

[0067] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A jet printing apparatus characterized by comprising: The application relates to a printing device, comprising: a support configured to define a printing station and a plurality of maintenance stations; a transverse driving unit arranged on the support and configured to drive the printing unit to move along a transverse direction so as to reach the printing station or the maintenance station, the transverse direction being perpendicular to a conveying direction of an object to be printed; at least one printing unit connected to the driving unit and configured to print the object to be printed; a printing cover arranged at the printing station and configured to define a printing cavity; a suction unit arranged at the printing station, a gap being defined between an upper edge of the suction unit and a lower edge of the printing cover and configured to allow the object to be printed to pass through the gap; the suction unit comprises a suction groove arranged above the suction assembly and in communication with the suction assembly, the suction groove comprises a plurality of side walls, a gap being defined between an upper edge of the side walls and the lower edge of the printing cover and configured to allow the object to be printed to pass through the gap, and the suction groove is provided with a ventilation hole in communication with the suction assembly. Further comprising:

2. The printing apparatus of claim 1, wherein a longitudinal driving unit arranged on the transverse driving unit and configured to drive the printing unit to move along a longitudinal direction so as to allow a nozzle of the printing unit to enter the printing cavity, the longitudinal direction being perpendicular to a plane in which the object to be printed is located. The suction assembly comprises a fan, and the suction unit further comprises at least one of:

3. The printing apparatus of claim 1, wherein an electric field adsorption purification mechanism; a mechanical adsorption purification mechanism; and a steam-water separation mechanism. The printing unit comprises:

4. The printing apparatus according to claim 2, wherein a nozzle mounting plate connected to the longitudinal driving unit; and a nozzle arranged on the nozzle mounting plate; The support comprises: a locking unit arranged at the maintenance station and configured to lock the nozzle mounting plate in a first state and unlock the nozzle mounting plate in a second state. The locking unit comprises two locking plates arranged correspondingly at two ends of the nozzle mounting plate, and the locking plates are provided with screw holes so as to lock the locking plates and the nozzle mounting plate through bolts.

5. The printing apparatus of claim 4, wherein The nozzle mounting plate comprises a first nozzle mounting plate and a second nozzle mounting plate arranged in parallel, and the nozzles on the first nozzle mounting plate are arranged oppositely to the nozzles on the second nozzle mounting plate; 6. The printing apparatus of claim 4, wherein The locking unit comprises a first locking unit and a second locking unit, the first locking unit is configured to lock the first nozzle mounting plate in the first state and unlock the first nozzle mounting plate in the second state, and the second locking unit is configured to lock the second nozzle mounting plate in the first state and unlock the second nozzle mounting plate in the second state. The inside of the printing cover is provided with a flow guide mechanism.

7. The printing apparatus of claim 1, wherein The application relates to a printing device, comprising:

8. The printing apparatus of claim 1, wherein the nozzle a printing needle configured to flow a liquid to be printed; and a printing needle driving unit connected to the printing needle and configured to drive the printing needle under the control of a driving electric signal so as to allow the liquid to be atomized to be sprayed from the printing needle. The plurality of maintenance stations comprises:

9. The printing apparatus of claim 1, wherein, a first maintenance station and a second maintenance station; wherein the first maintenance station and the second maintenance station are arranged at a first side of the printing station, or the first maintenance station is arranged at the first side of the printing station, and the second maintenance station is arranged at a second side of the printing station. The at least one printing unit comprises a first printing unit and a second printing unit; 10. The printing apparatus of claim 9, wherein, ​ The lateral drive unit is further configured to drive the first jet printing unit to move in the lateral direction so as to reach the jet printing station or the first maintenance station, and to drive the second jet printing unit to move in the lateral direction so as to reach the jet printing station or the second maintenance station.

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