Printing equipment that prints in the circumferential direction

Abstract

The present invention belongs to the field of printing technology, solves the technical problem that the existing printing equipment has a large space occupation, and provides a printing equipment for circumferential printing, the equipment comprising: a rotating mechanism, used to drive the printing medium to rotate around the axis of the rotating mechanism; a printing mechanism, used to spray liquid on the printing medium; a rotating mechanism, the output end of the rotating mechanism is connected to the rotating mechanism in a transmission manner, and the rotating mechanism drives the rotating mechanism to move toward or away from the printing mechanism in a circular motion; wherein at least two printing mechanisms are provided, each printing mechanism prints a part of the image data of the image to be printed, and the rotating mechanism drives the rotating mechanism to move to each printing mechanism position for printing, and then moves to the next printing mechanism position for printing, until a printed image is generated on the surface of the printing medium. The present invention has the technical advantages of small space occupation and compact structure.

Description

Technical Field

[0001] The present invention relates to the field of printing technology, and in particular to a printing device for printing along a circumferential direction. Background Art

[0002] For a printing medium in the shape of a cylinder or cone, it is very difficult to print patterns or words on its circumferential side surface. Traditional technology can only be achieved by screen printing, which is inefficient. In order to solve the problem of low efficiency of traditional screen printing, inkjet printing was later used to spray print on the circumferential side surface of the cylinder or cone. However, the existing inkjet printing scheme usually uses a single printing station to inkjet print the printing medium in sequence. If it is necessary to print the image to be printed on the printing medium in steps, multiple devices are required and the multiple devices are set in the form of an assembly line to process the printing medium in sequence. In this way, multiple devices set in the form of an assembly line require a large space, which requires more space for the entire production; therefore, the existing printing equipment has the technical problem of occupying a large space. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a printing device that prints along a circumferential direction, which is used to solve the technical problem that existing printing devices have a large footprint.

[0004] An embodiment of the present invention provides a printing device that prints in a circumferential direction, the device comprising: a rotating mechanism, used to drive a printing medium to rotate around an axis of the rotating mechanism; a printing mechanism, used to spray liquid on the printing medium; a rotating mechanism, wherein an output end of the rotating mechanism is transmission-connected to the rotating mechanism, and the rotating mechanism drives the rotating mechanism to move toward or away from the printing mechanism in a circular motion; wherein at least two printing mechanisms are provided, each printing mechanism prints a portion of image data of an image to be printed, and the rotating mechanism drives the rotating mechanism to move to each printing mechanism position for printing, and then moves to the next printing mechanism position for printing, until a printed image is generated on the surface of the printing medium.

[0005] Furthermore, at least four printing mechanisms are provided; each of the printing mechanisms is used to spray liquids of different materials on the printing medium.

[0006] Furthermore, the printing mechanism at least includes: a first printing mechanism, a second printing mechanism and a third printing mechanism; the first printing mechanism is used for pre-processing the printing medium; the second printing mechanism is used for inkjetting the printing medium; and the third printing mechanism is used for spraying varnish on the printing medium.

[0007] Furthermore, the number of the rotating mechanisms is consistent with the number of the printing mechanisms, and each rotating mechanism is provided corresponding to a printing mechanism.

[0008] Furthermore, the rotating mechanism includes: a driving motor and a turntable; the turntable is connected to the rotating mechanism, the turntable is transmission-connected to the output end of the driving motor, and the driving motor drives the turntable to drive the rotating mechanism to move toward or away from the printing mechanism.

[0009] Furthermore, the device also includes: a curing mechanism for curing the liquid sprayed on the printing medium by the printing mechanism.

[0010] Furthermore, the number of the curing mechanisms is consistent with the number of the printing mechanisms, and each of the curing mechanisms is located between two adjacent printing mechanisms.

[0011] Furthermore, the printing device further comprises: a fixing mechanism; the fixing mechanism is connected to the curing mechanism, the rotating mechanism and the fixing mechanism are arranged coaxially, and the curing mechanism is arranged corresponding to the rotating mechanism.

[0012] Furthermore, the printing mechanism includes: a crossbeam and a printing carriage; the printing carriage is connected to the crossbeam in a relatively sliding manner, and the sliding direction of the printing carriage is consistent with the axial direction of the rotating shaft.

[0013] Furthermore, the printing mechanism also includes: a lifting component, the lifting component is connected to the printing carriage, and the lifting component drives the printing carriage to rise and fall.

[0014] In summary, the beneficial effects of the present invention are as follows:

[0015] More than two printing mechanisms are arranged to process the printing medium in steps respectively, and the printing medium is driven to be transmitted in a circular motion. Therefore, all the printing mechanisms can be arranged in a circular array, thereby making the structure of the entire device more compact and the footprint of the entire device smaller, solving the technical problem of the existing printing device that occupies a large space, and having the advantages of small footprint and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the printing device in the first embodiment of the present invention;

[0018] Figure 2 for Figure 1 A top view of

[0019] Figure 3 for Figure 1 Side view of

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of a printing device in a second embodiment of the present invention;

[0021] Figure 5 A state diagram of ink discharge from a nozzle for printing small-size print media;

[0022] Figure 6 This is a diagram showing the ink discharge status of the nozzle when printing larger size print media.

[0023] Parts and numbers in the picture:

[0024] 1. Rotating mechanism; 11. Rotating motor; 12. Rotating body; 2. Printing mechanism; 21. Crossbeam; 22. Mounting seat; 23. Print head; 231. Nozzle; 24. Longitudinal adjustment mechanism; 3. Rotating mechanism; 31. Driving motor; 32. Turntable; 33. Fixing mechanism; 4. Curing mechanism; 41. Curing frame; 42. Curing lamp; 5. Printing medium. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described in conjunction with the drawings in the embodiment of the present invention. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article or device. In the absence of further restrictions, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the various features in the embodiments and examples of the present invention can be combined with each other, all within the scope of protection of the present invention.

[0026] The following is combined with Figure 1 -Attached Figure 6 The present invention is further described in detail.

[0027] The first embodiment of the present invention provides a printing device for printing along the circumferential direction, Figure 1 and Figure 2 As shown, the device includes: a rotating mechanism 1, which is used to drive the printing medium 5 to rotate around the axis of the rotating mechanism 1; a printing mechanism 2, which is used to spray liquid on the printing medium 5; a rotating mechanism 3, the output end of which is transmission-connected to the rotating mechanism 1, and the rotating mechanism 3 drives the rotating mechanism 1 to move toward or away from the printing mechanism 2 in a circular motion; wherein, at least two printing mechanisms 2 are arranged, each printing mechanism 2 prints a part of the image data of the image to be printed, and the rotating mechanism 3 drives the rotating mechanism 1 to move to each printing mechanism 2 position for printing, and then moves to the next printing mechanism 2 position for printing, until a printed image is generated on the surface of the printing medium 5.

[0028] The printing device provided in the embodiment of the present invention is suitable for printing along the circumferential side, for example, the printing medium 5 is a cylinder or a cone, or the printing area is a cylinder or a cone; or the printing medium 5 can be wound around the cylinder or the cone, so that the printing medium 5 is attached to the cylinder or the cone, so that the printing area of ​​the printing medium 5 forms a circular form, and the printing medium 5 is usually made of a flexible material. This embodiment mainly takes the printing medium 5 as a cylinder as an example for detailed introduction.

[0029] The rotating mechanism 1 includes a rotating motor 11 and a rotating body 12. The rotating motor 11 drives the rotating body 12 to rotate, thereby driving the printing medium 5 to rotate. In the present embodiment, the rotating body 12 is a three-jaw pneumatic chuck. The rotating body 12 clamps the printing medium 5, so that the rotating motor 11 drives the rotating body 12 to rotate, thereby driving the printing medium 5 to rotate; in other embodiments, if the printing medium 5 is a cylinder or a cone, the rotating body 12 can be a clamping mechanism, such as a clamp, a chuck or a cylinder; if the printing medium 5 is a flexible material and needs to be attached to a cylinder or a cone, the rotating body 12 can also be a cylinder or a cone, attaching the printing medium 5, so that the driving motor 31 drives the rotating body 12 to rotate, thereby driving the printing medium 5 to rotate.

[0030] The rotating mechanism 3 moves in a circular motion, and specifically can be a driving motor 31 (refer to Figure 3 ) is rotated by adding a turntable 32, the printing mechanism 2 is arranged corresponding to the circumferential side wall of the rotating mechanism 3, and part of the printing mechanism 2 overlaps with the rotating mechanism 3, further making the structure of the entire device more compact.

[0031] Each printing mechanism 2 prints a part of the image data of the image to be printed respectively: for example, the printing medium 5 needs to be processed step by step, including step by step printing from the thickness direction of the printed image and step by step printing from the length and / or width direction of the printed image; step by step printing from the thickness direction of the printed image can be understood as: the surface of the printing medium 5 needs to be pre-treated by spraying a plasma treatment liquid in sequence to form an adhesion layer; then inkjet is performed on the surface of the adhesion layer formed on the surface of the printing medium 5 to form an image, and then varnish or hot stamping is performed on the image formed by inkjet; therefore, the layer segmentation from the thickness can be performed according to the entire printed image to be formed to obtain the step-by-step processed image data, and each printing mechanism 2 executes at least one image data; step by step printing from the length and / or width direction of the printed image can be understood as: the printed image is divided into several areas in terms of length and / or width, the corresponding image is printed on each area, and the local images are printed in sequence to form a partial image, and finally the local images are spliced ​​to form a printed image; the rotating mechanism 1 drives the printing mechanism 2 to move to the corresponding printing mechanism 2 in sequence according to the image data to be processed step by step, completes the printing, and finally forms a printed image.

[0032] Preferably, the printing device also includes a positioning system, which is used to position the printing medium so as to form an accurate printed image on the surface of the printing medium. Specifically, the position information of the rotating mechanism can be obtained to determine the position information of the printing area of ​​the printing medium relative to the rotating mechanism; the outline size of the printing medium can be obtained to control the printing of the first part of the image data on the printing medium to form the first image; the position information of the first image is obtained, and the first image is used as a reference image to confirm the position information of the next image data to be printed, and control the printing of the next part of the image data until the printing is completed to form a printed image; the positioning system is added to reduce the printing error between each part of the image data, so as to form an accurate printed image.

[0033] Combination Figure 1 as well as Figure 5 The printing device also includes a controller, which is electrically connected to the printing mechanism 2 to control the operation of the printing mechanism; the printing device also includes an ink bottle group, which is provided with 4 ink bottles, respectively used to hold red (M), yellow (Y), cyan (C) and black (K) ink; the printing mechanism 2 includes a plurality of rows of nozzles 231 (refer to Figure 5 ), each row of nozzles 231 is connected to four ink bottles, and the required colors are formed by controlling the ink output of each specific color to perform inkjet printing on the printing medium 5, that is, a single row realizes mixed color printing. For a printing medium 5 of a smaller size, a row of nozzles 231 is controlled to perform inkjet printing on it; more than two printing mechanisms 2 are set to perform inkjet printing on different printing media 5 at the same time, that is, a printing device can process more than two printing media 5 at the same time, thereby improving the processing speed. A rotating mechanism 3 is set in a printing device, and multiple printing media are transmitted on a rotating mechanism 3. Multiple rotating mechanisms 1 can be set on the rotating mechanism 3 at equal intervals according to the spacing between the printing mechanisms 2, and transmitted at the same time, so that each rotating mechanism 1 corresponds to the printing mechanism 2 one by one; so that the printing speed is accelerated, the technical problem that the existing printing device prints the printing medium 5 too slowly is solved, and the technical effect of fast printing is obtained; in other embodiments, each row of nozzles 231 can also be connected to a single ink bottle, so that each row of nozzles 231 can print a single color. When two printing mechanisms 2 are provided, the nozzle 23 of each printing mechanism 2 is connected to two ink bottles, so that the nozzle 23 can spray out a mixed color of two colors; or the nozzle 23 of each printing mechanism 2 is connected to an ink bottle, so that a printed pattern of a mixture of two colors is finally obtained; preferably, four printing mechanisms 2 are provided, and the nozzle 23 of each printing mechanism 2 is connected to an ink bottle accordingly, so that each printing mechanism 2 can spray different single colors on the printing medium 5, and finally form a mixed color. The printing mechanism 2 prints on different printing media at the same time, which speeds up the number of prints completed per unit time.

[0034] Preferably, the printing mechanism 2 includes at least one row of nozzles 231 (see Figure 5 ), the arrangement direction of the nozzles 231 is parallel to the axial direction of the printing medium 5, and the relative position of the nozzles 231 and the axial direction of the printing medium 5 is adjustable, and each row of nozzles 231 sprays ink on the circumference of the printing medium 5 independently of each other.

[0035] In this embodiment, each row of nozzles 231 works independently of each other, so the controller can control the number of rows of ink ejected by the nozzle head 23 according to the diameter of the printing medium 5. The diameter of the printing medium 5 is input into the controller system, and the controller system calculates the number of rows of nozzles 231 that need to be opened. When the diameter of the printing medium 5 is small (generally, the printing medium with a diameter less than 8 mm is called a small-size printing medium), such as Figure 5 As shown, the controller controls the nozzles 231 of the printing mechanism 2 in the row closest to the nearest printing medium 5 to spray ink on the printing medium 5. If the size of the printing medium 5 is large, such as Figure 6 As shown, the nozzles 231 within a range from the surface of the printing medium 5 are controlled to be opened to spray the printing medium 5, so as to speed up the spraying of the printing medium 5, and avoid the situation that the rotation speed of the printing medium 5 is too high, the nozzles 231 spray less ink, and the circumferential direction of the printing medium 5 cannot be covered; in other embodiments, a distance measuring mechanism can be correspondingly provided at each row of the nozzles 23, and the distance measuring mechanism detects the distance S from the nozzles 231 of a certain row to the surface of the printing medium 5. If S is within a preset range, preferably, the preset range is 1mm≤S≤2mm, the corresponding row of nozzles 231 is opened for inkjet printing; the distance S from the nozzle 231 to the surface of the printing medium 5 is the height difference of the nozzle 231. Too high a height difference will cause the ink droplets to scatter, affecting the printing effect, while too low a height difference will cause the ink droplets to impact the surface of the printing medium 5 and splash. When the height difference is within a certain range, the ink droplets just fall on the surface of the printing medium 5 without splashing, thereby ensuring the printing effect; in this way, the corresponding nozzles 231 can be opened specifically according to the diameter of the printing medium 5 to print on the printing medium 5. Specifically, a switch valve is provided on the ink tube connected to each row of nozzles 231 , and a corresponding switch valve is opened according to the specific size of the printing medium 5 .

[0036] Since each row of nozzles 231 operates independently of each other, the corresponding rows of nozzles 231 can be opened according to the diameter of the printing medium 5 to print on the printing medium 5. If the diameter of the printing medium 5 is small, the row of nozzles 231 closest to the surface of the printing medium 5 is opened to perform inkjet printing on the printing medium 5, so that the ink sprayed by the nozzles can act better on the printing medium 5, and there is no need to consider the distance between the rows of nozzles, which causes some rows of nozzles 231 to not match the printing medium, or too far from the surface of the printing medium, causing ink droplets to splash and cause poor printing effect; therefore, the printing mechanism 2 can perform inkjet printing on the printing medium 5 with a small size or a small diameter of the printing area required; the technical problem that the existing printing device has poor printing effect when printing on the printing medium 5 with a small diameter is solved. In addition, when the size of the printing medium 5 is large, the row of nozzles 231 corresponding to the specified distance from the surface of the printing medium 5 is opened to perform inkjet printing on the printing medium 5, which can speed up the printing of the printing medium 5 and improve the printing accuracy, so that the printing device can meet the requirements of inkjet printing on the printing medium 5 with a small size, and can print the printing size quickly and accurately.

[0037] In this embodiment, more than two printing mechanisms 2 are provided to process the printing medium 5 in steps respectively, and the printing medium 5 is driven to be transmitted in a circular motion. Therefore, all the printing mechanisms 2 can be arranged in a circular array, thereby making the structure of the entire device more compact and the footprint of the entire device smaller, solving the technical problem of the existing printing device occupying a large space, and having the technical advantages of occupying a small space and a compact structure.

[0038] Preferably, at least four printing mechanisms 2 are provided; each printing mechanism 2 is used for spraying liquids of different materials on the printing medium 5 .

[0039] In this embodiment, four printing mechanisms 2 are provided, and the four printing mechanisms 2 are evenly distributed corresponding to the circumferential side walls of the rotating mechanism 3, so that the structure of the entire device is more compact. A printing mechanism 2 is provided at every 90° interval, and each time the rotating device rotates 90°, it corresponds to a printing mechanism 2. When it rotates once, the rotating mechanism 3 rotates one circle, and a printing can be completed. A loading station and an unloading station are also provided on the rotating mechanism 3, and the loading station and the unloading station can be set at the same place. When the printing medium 5 is printed, the printing medium 5 is removed and the next medium 5 to be printed is installed at the same time. The operation is simple and the rotation mechanism 3 is convenient for circulation. In other embodiments, the rotating mechanism 3 can also be set to a conveying mode of a conveyor belt. In this case, the loading station and the unloading station are respectively located at the two ends of the transmission direction of the conveyor belt; the rotating mechanism 1 is arranged at intervals on the conveyor belt, and there is a space for the rotating mechanism 1 to pass under the conveyor belt so that the rotating mechanism 1 returns to the initial position; the four printing mechanisms 2 are respectively filled with red (M), yellow (Y), cyan (C) and black (K) inks, and the rotating mechanism 3 drives the printing medium 5 to pass under the four printing mechanisms 2 in turn, and prints the surface of the printing medium 5 respectively. After the rotating mechanism 3 rotates one circle, the four colors are printed, and finally a color printed image is formed on the surface of the printing medium 5; liquids with different materials can be of different colors or different materials; the printing path can be printing in sequence or repeatedly printing on the same printing mechanism 2 according to printing requirements.

[0040] Preferably, Figure 1 As shown, the number of the rotating mechanisms 1 is consistent with the number of the printing mechanisms 2 , and each rotating mechanism 1 is provided corresponding to a printing mechanism 2 .

[0041] In this embodiment, four rotating mechanisms 1 are provided, and each rotating mechanism 1 is evenly distributed in the circumferential direction of the rotating mechanism 3, so that each time the rotating mechanism 3 rotates 90°, each rotating rotating mechanism 1 corresponds to a printing mechanism 2; in other embodiments, the number of rotating mechanisms 1 corresponds to the number of printing mechanisms 2. If the number of printing mechanisms 2 is set to 3, three corresponding rotating mechanisms 1 are also provided.

[0042] Preferably, the rotating mechanism 3 includes: a driving motor 31 and a turntable 32; the turntable 32 is connected to the rotating mechanism 1, and the turntable 32 is transmission-connected to the output end of the driving motor 31, and the driving motor 31 drives the turntable 32 to drive the rotating mechanism 1 to move toward or away from the printing mechanism 2.

[0043] In this embodiment, the fixing mechanism 33 is fixedly arranged below the turntable 32, and the turntable 32 is arranged as a square plate-shaped structure. The four rotating mechanisms 1 are correspondingly arranged in the middle of the side length of the turntable 32. When the printing medium 5 is located below the printing mechanism 2, the curing device is correspondingly located above the four top corners of the turntable 32; the rotating mechanism 3 also includes a divider and an encoder. The divider is used to control the stop of the driving motor 31, and the encoder is used to detect the rotation angle signal of the turntable 32 and feed the angle signal back to the controller.

[0044] Preferably, the printing device further comprises: a curing mechanism 4 for curing the liquid sprayed by the printing mechanism 2 on the printing medium 5 .

[0045] In this embodiment, the curing mechanism 4 includes a curing frame 41 and a curing lamp 42, and the printing device also includes a fixing mechanism 33, which is arranged below the rotating mechanism 3 and is used to install the curing mechanism 4. Specifically, the curing frame 41 is installed on the fixing mechanism 33, and the curing lamp 42 is installed on the curing frame 41, so that a space for the printing medium 5 to rotate and pass through is formed between the curing lamp 42 and the fixing mechanism 33; the curing lamp 42 of the curing mechanism 4 is set to be a UV light curing lamp, and the light direction of the UV light curing lamp 42 is irradiated downward into the printing medium 5; during the transmission process, the rotating mechanism 3 passes below the curing mechanism 4, so that during the process of transmitting the printing medium 5 by the rotating mechanism 3, the curing mechanism 4 cures it, so as to avoid the ink dripping due to its own gravity during the transmission process and affecting the printing effect; the distance between the curing mechanism 4 and the printing mechanism 2 is set to be less than 150 cm, so that the printing mechanism 2 can be transmitted to the bottom of the curing mechanism 4 in time after printing, and the ink on the printing medium 5 is cured.

[0046] Preferably, the number of the curing mechanisms 4 is consistent with the number of the printing mechanisms 2 , and each curing mechanism 4 is located between two adjacent printing mechanisms 2 .

[0047] In this embodiment, when the rotating mechanism 3 is a turntable 32 type transmission, the curing mechanism 4 is inserted between two adjacent printing mechanisms 2; a curing mechanism 4 is correspondingly arranged beside each printing mechanism 2, and the curing mechanism 4 solidifies the ink formed on the surface of the printing medium 5 to prevent the ink from dripping due to its own gravity or being thrown out by the rotating centrifugal force of the printing medium 5 during the process of moving to the bottom of the next printing mechanism 2. In addition, the curing power of all curing mechanisms 4 is the same, and the curing mechanism 4 solidifies the image information printed by each printing mechanism 2 respectively; as mentioned above, the layers are printed in steps, and each curing mechanism 4 corresponds to a printed image, and after curing, a layered structure with a first refractive index is formed. Since the materials of each layer are different, the refractive index of the layered structure formed after curing is different. After curing, all the layered structures with different refractive indices are stacked together to form a printed image with a matte effect.

[0048] The curing power of the curing mechanism 4 increases in sequence along the transmission direction of the printing medium 5. The transmission direction is according to the number of printings, that is, the first printing, the second printing, the third printing, ... the Nth printing; the preferred embodiment is provided with a printing mechanism 2, namely the first printing mechanism, the second printing mechanism, the third printing mechanism and the fourth printing mechanism, and the curing mechanism 4 corresponds to: the first curing mechanism, the second curing mechanism, the third curing mechanism and the fourth curing mechanism, and the low-power curing lamp 42 is used to irradiate the ink in the first three printings, and the same low-power curing power can also be set; the ink of the first few times is in a state of preliminary curing, so that the ink will not be separated from the printing medium 5 due to the rotation of the printing medium 5, and the ink is prevented from being too dry and inconvenient for the next ink to mix with the previous ink; at the time of the last printing, which is the fourth printing mechanism in this embodiment, the curing lamp 42 with the maximum power is used to finally cure the ink, so that the ink forms a stable and dry pattern on the surface of the printing medium 5.

[0049] Preferably, the printing device further comprises: a fixing mechanism 33 ; the fixing mechanism 33 is connected to the curing mechanism 4 , the rotating mechanism 3 and the fixing mechanism 33 are arranged coaxially, and the curing mechanism 4 is arranged corresponding to the rotating mechanism 1 .

[0050] In this embodiment, specifically, the turntable 32 and the fixing mechanism 33 are arranged coaxially, the fixing mechanism 33 is located below the turntable 32, and the fixing mechanism 33 is arranged on the drive motor 31 and is relatively fixedly connected to the drive motor 31; the turntable 32 can rotate relative to the fixing mechanism 33; that is, the turntable 32 rotates above the fixing mechanism 33, and the area of ​​the turntable 32 is smaller than the area of ​​the fixing mechanism 33, and the rotating mechanism 1 is arranged in the circumferential direction of the turntable 32, and the turntable 32 is rotated to make the rotating mechanism 1 rotate and pass under the curing mechanism 4. In other embodiments, the fixing mechanism 33 and the turntable 32 can also be in the same plane, and the curing mechanism 4 can be arranged below the rotating mechanism 1 or above the rotating mechanism 1.

[0051] Preferably, the printing mechanism 2 comprises: a crossbeam 21 and a printing carriage; the printing carriage is connected to the crossbeam 21 in a relatively sliding manner, and the sliding direction of the printing carriage is consistent with the axial direction of the rotating shaft.

[0052] In this embodiment, the printing carriage includes a mounting seat 22 and a nozzle 23, the arrangement direction of the nozzles 231 is parallel to the central axis of the printing medium 5 in a row, a guide rail is provided on the crossbeam 21, and multiple rows of independent nozzles 231 form the nozzle 23, the nozzle 23 is mounted on the mounting seat 22, the mounting seat 22 slides along the direction of the guide rail, and the linear drive motor 31 is used to drive the mounting seat 22 to move along the guide direction of the guide rail, so that the nozzle 23 can be slidably arranged on the crossbeam 21 along the guide direction of the guide rail, the guide direction of the guide rail is parallel to the central axis of the printing medium 5, and the nozzle 23 moves along the guide direction of the guide rail to adjust the relative position of the nozzle 231 and the axial direction of the printing medium 5, so that the ink sprayed by the nozzle 231 covers the length direction of the printing medium 5, and the rotating mechanism 1 drives the printing medium 5 to rotate so that the ink sprayed by the nozzle 23 covers the circumferential direction of the printing medium 5, so that the ink printed by the printing nozzle 23 covers the entire circumferential side surface of the printing medium 5.

[0053] Preferably, the printing mechanism 2 further comprises: a lifting component, the lifting component is connected to the printing carriage, and the lifting component drives the printing carriage to rise and fall.

[0054] In this embodiment, the distance from the nozzle 231 to the printing medium 5 is adjustable. Specifically, a longitudinal adjustment mechanism 24 is provided between the mounting seat 22 and the slide rail, and the longitudinal adjustment mechanism 24 adjusts the relative position of the mounting seat 22 in the vertical direction. The longitudinal adjustment mechanism 24 uses a linear motor to drive the mounting seat 22 to reciprocate in the vertical direction, thereby adjusting the distance from the nozzle 231 to the surface of the printing medium 5. The distance from the nozzle 231 to the surface of the printing medium 5 can be adjusted according to the size of the printing medium 5, so that the distance from the nozzle 231 to the surface of the printing medium 5 is within a suitable range, so that the ink droplets can better print on the printing medium 5, and thus the printing mechanism 2 can be more adapted to printing media 5 of different sizes.

[0055] The second embodiment of the present invention is different from the first embodiment in that the solidifying mechanism 4 is connected to the printing mechanism, as shown in FIG. Figure 4 As shown, the printing mechanism 2 also includes a mounting seat 22, which is slidably arranged on the slide rail, and a nozzle 23 is mounted on the mounting seat 22, and the nozzle 23 is located above the printing medium 5; specifically, the curing mechanism 4 is arranged on the mounting seat 22, and the curing mechanism 4 is located beside the printing nozzle 23, and the curing mechanism 4 moves along the guide direction of the guide rail together with the nozzle 23; the curing mechanism 4 moves together with the nozzle 23, and the light source of the UV light lamp directly irradiates the circumferential direction of the printing medium 5. In the process of the nozzle 231 spraying ink on the printing medium 5, the curing device cures the ink sprayed by the nozzle 231 to cure the sprayed ink, so that a stronger adhesion is formed between the ink and the surface of the printing medium 5.

[0056] The third embodiment of the present invention is different from the first embodiment in that the printing mechanism 2 at least includes: a first printing mechanism, a second printing mechanism and a third printing mechanism; the first printing mechanism is used for pre-processing the printing medium; the second printing mechanism is used for inkjet the printing medium; and the third printing mechanism is used for spraying varnish on the printing medium.

[0057] In this embodiment, three printing mechanisms 2 are provided; the first printing mechanism sprays plasma treatment liquid on the surface of the printing medium to form an adhesion layer on the surface of the printing medium to facilitate the adhesion of ink to the surface of the printing medium; the second printing mechanism performs inkjet to form a pattern layer on the surface formed by the adhesion layer, and the inkjet includes but is not limited to white ink or color ink; the third printing mechanism is used to spray varnish on the pattern layer to form a varnish layer so as to perform hot stamping and other processes on the pattern layer; in actual use, additional printing mechanisms 2 can be added according to process requirements, and all printing mechanisms 2 are evenly distributed in the transmission direction of the transmission device.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A printing device for printing in a circumferential direction, characterized in that: The device comprises: A rotating mechanism, used to drive the printing medium to rotate around the axis of the rotating mechanism; A printing mechanism for ejecting liquid on a print medium; A rotating mechanism, wherein the output end of the rotating mechanism is in transmission connection with the rotating mechanism, and the rotating mechanism drives the rotating mechanism to move toward or away from the printing mechanism in a circular motion; Wherein, at least two printing mechanisms are provided, each printing mechanism prints a portion of image data of the image to be printed, and the rotating mechanism drives the rotating mechanism to move to each printing mechanism position for printing, and then moves to the next printing mechanism position for printing, until a printed image is generated on the surface of the printing medium; The printing device also includes a positioning system, which is used to locate the position of the printing medium to facilitate the formation of an accurate printed image on the surface of the printing medium; specifically, the positioning system obtains the position information of the rotating mechanism to determine the position information of the printing area of ​​the printing medium relative to the rotating mechanism; obtains the outline size of the printing medium, controls the printing of the first part of the image data on the printing medium to form a first image; obtains the position information of the first image, uses the first image as a reference image, confirms the position information of the next image data to be printed, and controls the printing of the next part of the image data until printing is completed to form a printed image.

2. The printing device for printing in the circumferential direction according to claim 1, characterized in that: At least four printing mechanisms are provided; each of the printing mechanisms is used for spraying liquids of different materials on the printing medium.

3. The printing device for printing in the circumferential direction according to claim 1, characterized in that: The printing mechanism at least includes: a first printing mechanism, a second printing mechanism and a third printing mechanism; the first printing mechanism is used for pre-processing the printing medium; the second printing mechanism is used for inkjetting the printing medium; and the third printing mechanism is used for spraying varnish on the printing medium.

4. The printing device for printing in the circumferential direction according to any one of claims 1 to 3, characterized in that: The number of the rotating mechanisms is consistent with the number of the printing mechanisms, and each rotating mechanism is arranged corresponding to one printing mechanism.

5. The printing device for printing in the circumferential direction according to any one of claims 1 to 3, characterized in that: The rotating mechanism comprises: a driving motor and a turntable; the turntable is connected to the rotating mechanism, the turntable is drivingly connected to the output end of the driving motor, and the driving motor drives the turntable to drive the rotating mechanism to move toward or away from the printing mechanism.

6. The printing device for printing in the circumferential direction according to any one of claims 1 to 3, characterized in that: The device further comprises: a curing mechanism for curing the liquid sprayed on the printing medium by the printing mechanism.

7. The printing device for printing in the circumferential direction according to claim 6, characterized in that: The number of the curing mechanisms is consistent with the number of the printing mechanisms, and each of the curing mechanisms is located between two adjacent printing mechanisms.

8. The printing device for printing in the circumferential direction according to claim 6, characterized in that: The printing device further comprises: a fixing mechanism; the fixing mechanism is connected to the curing mechanism, the rotating mechanism and the fixing mechanism are arranged on the same central axis, and the curing mechanism is arranged corresponding to the rotating mechanism.

9. The printing device for printing in the circumferential direction according to claim 1, characterized in that: The printing mechanism comprises: a crossbeam and a printing carriage; the printing carriage is connected to the crossbeam in a relatively sliding manner, and the sliding direction of the printing carriage is consistent with the axial direction of the rotating shaft.

10. The printing device for printing in the circumferential direction according to claim 9, characterized in that: The printing mechanism further includes: a lifting component, the lifting component is connected to the printing carriage, and the lifting component drives the printing carriage to rise and fall.

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