Nozzle assembly of digital printing machine

Abstract

A nozzle assembly of a digital printing machine, comprising a nozzle carriage (1), powder dispensing mechanisms (3), a driving assembly, and a jet printing mechanism (2) disposed in the interior of the nozzle carriage (1). The powder dispensing mechanisms (3) are disposed on two sides of the jet printing mechanism (2). A UV curing mechanism (4) is provided between each powder dispensing mechanism (3) and the jet printing mechanism (2). A sliding block (5) is provided on a rear side wall of the nozzle carriage (1). The sliding block (5) is used for being slidably connected to a cross beam of the printing machine. The driving assembly is connected to the sliding block (5) and is used for driving the nozzle carriage (1) to lift and lower relative to the sliding block (5). The powder dispensing mechanisms (3) are disposed on the nozzle carriage (1) on two sides of the jet printing mechanism (2), so that the powder dispensing mechanisms (3) are combined with the jet printing mechanism (2) to achieve the integration of powder dispensing and digital printing, which can not only ensure the printing effect of the product, but also simplify the printing process. In addition, there is no need for repeated positioning, and the present invention can be applied to the printing of various products.

Description

A digital printer nozzle assembly

[0001] The present application claims priority to the Chinese patent application No. 202410699590.5, filed on May 31, 2024, and entitled "A digital printer nozzle assembly", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of printers, in particular to a digital printer nozzle assembly. BACKGROUND

[0003] Digital printers are very common in daily life, but existing digital printers can only achieve digital printing of white, color and varnish, making it difficult to completely restore the authenticity of the real object and display special effects.

[0004] The existing powdering process cannot be directly implemented using a digital printer. In order to increase the visual effects of the printed pattern on the basis of restoring the true colors of the real object, the conventional method is to use a conventional printer to print through a plate, and then use a transfer (thermal transfer and gold stamping) device or a powdering device through multiple devices to achieve the purpose of increasing the visual effects of the printing process. Although this can increase the special effects of the printed pattern, the disadvantages are also obvious. All soft materials and irregularly sized and shaped printing objects cannot be repeatedly positioned by multiple machines, and cannot meet the printing needs of most products. SUMMARY

[0005] To solve the above technical problems, the present application provides a digital printer nozzle assembly, which integrates powdering and digital printing through the combination of a powdering mechanism and a printing assembly, ensures product quality, and can be applied to the printing of various products.

[0006] The technical solution adopted by the present application to solve the technical problems is as follows:

[0007] A digital printer nozzle assembly, comprising a nozzle trolley, a powdering mechanism, a driving assembly, and a printing mechanism arranged inside the nozzle trolley, the powdering mechanism is arranged on both sides of the printing mechanism, a UV curing mechanism is arranged between the powdering mechanism and the printing mechanism, a sliding block is arranged on the rear wall of the nozzle trolley, the sliding block is used for sliding connection with the cross beam of the printer, the driving assembly is connected with the sliding block, and the driving assembly is used for driving the nozzle trolley to ascend and descend relative to the sliding block.

[0008] Preferably, an installation plate is arranged inside the nozzle trolley, a lead screw motor and a guide rail are arranged on the installation plate, the guide rail is parallel to the lead screw of the lead screw motor, a sliding block is slidingly connected to the guide rail, a sliding plate is connected to the sliding block and the nut seat, and the sliding plate is connected with the powdering mechanism.

[0009] Preferably, each side of the printing mechanism has multiple powder-spreading mechanisms, and the multiple powder-spreading mechanisms are distributed in a rectangular array.

[0010] Preferably, the powder-spraying mechanism includes a powder storage tank, a stirring brush, and a driving mechanism. The lower end of the powder storage tank is provided with a powder spraying head assembly, and the stirring brush is disposed inside the powder storage tank corresponding to the powder spraying head assembly. The driving mechanism is used to drive the stirring brush to rotate.

[0011] The powder storage tank is also connected to an air pipe connector, which is used to connect an air source to drive the powder to be sprayed out by the powder spraying head assembly.

[0012] Preferably, the powder storage tank has an opening at the top, and a top cover is threaded onto the opening, with the air pipe connector disposed on the top cover;

[0013] The driving mechanism is a rotary motor; the rotary motor is located inside the powder storage tank, and the output shaft of the rotary motor is connected to the stirring brush;

[0014] A rotating motor support plate is provided inside the top cover and between the inner wall of the top cover and the powder storage tank. A rotating motor fixing plate is provided inside the powder storage tank corresponding to the rotating motor support plate. The rotating motor support plate and the rotating motor fixing plate are connected by studs. The rotating motor is fixed on the rotating motor fixing plate.

[0015] Preferably, the lower end of the powder storage tank is provided with a powder suction pipe, the powder spraying head assembly is disposed inside the powder suction pipe, and the side wall of the powder suction pipe is provided with a powder discharge port for discharging excess powder.

[0016] Preferably, the powder spraying head assembly includes a lower cover, a powder spraying tube, a powder spraying head, and a powder sieve arranged coaxially. The lower cover is connected to the powder storage tank. One end of the powder spraying tube passes through the lower cover and communicates with the inside of the powder storage tank. The powder spraying head covers the other end of the powder spraying tube. The powder sieve is disposed inside the powder spraying head and is located between the inner wall of the powder spraying head and the powder spraying tube. The stirring brush is disposed inside the powder spraying tube.

[0017] Preferably, the lower cover includes a cover body and a ring protruding from the edge of the cover body, the ring being threadedly connected to the powder storage tank, and a sealing gasket being provided between the cover body and the powder storage tank;

[0018] The cover is provided with a flange nut and a sealing ring inside. The powder spraying pipe is threaded to the flange nut. The sealing ring fits against the flange nut and is located between the flange nut and the sealing gasket.

[0019] Preferably, the driving assembly is a lifting motor, and a screw rod is connected to an output shaft of the lifting motor and is in threaded connection with the sliding block.

[0020] Preferably, the spray head trolley is provided with an electrostatic eliminator.

[0021] The spray head assembly of the digital printing machine according to the embodiment of the present application has the following beneficial effects compared with the prior art: the powder scattering mechanism is arranged on both sides of the printing mechanism on the spray head trolley, so that the powder scattering mechanism is combined with the printing assembly to complete the integration of powder scattering and digital printing, which can better ensure the printing effect of products and simplify the printing process. Meanwhile, the powder scattering mechanism does not need to be repeatedly positioned and can be applied to the printing of various products. BRIEF DESCRIPTION OF DRAWINGS

[0022] Fig. 1 is a side view of the spray head assembly of the digital printing machine according to the embodiment of the present application.

[0023] Fig. 2 is an axial side view of the spray head assembly of the digital printing machine according to the embodiment of the present application.

[0024] Fig. 3 is a structural schematic view of the connection of the powder scattering mechanism and the mounting plate of the spray head assembly of the digital printing machine according to the embodiment of the present application.

[0025] Fig. 4 is a powder scattering principle diagram of the powder scattering mechanism according to the embodiment of the present application.

[0026] Fig. 5 is a structural schematic view of the powder scattering mechanism according to the embodiment of the present application.

[0027] Fig. 6 is an exploded view of Fig. 5.

[0028] Fig. 6 is an exploded view of Fig. 5. DETAILED DESCRIPTION

[0029] The specific embodiment of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application but are not used to limit the scope of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] As shown in FIGS. 1-2, a digital printing machine nozzle assembly of a preferred embodiment of the present application is transversely movably mounted on a printing machine beam, which can be connected by a linear motor, and the beam is longitudinally movably arranged on the frame of the digital printing machine. The digital printing machine nozzle assembly comprises a nozzle trolley 1 and a nozzle printing mechanism 2 arranged inside the nozzle trolley 1, and further comprises a powder scattering mechanism 3 and a driving assembly, the powder scattering mechanism 3 is arranged on both sides of the nozzle printing mechanism 2, and a UV curing mechanism 4 is arranged between the powder scattering mechanism 3 and the nozzle printing mechanism 2. A sliding block 5 is arranged on the rear wall of the nozzle trolley 1 and slides with the beam, and the driving assembly is connected with the sliding block 5 to drive the nozzle trolley 1 to ascend and descend relative to the sliding block 5. Specifically, the driving assembly is a lifting motor 6 fixed on the outer wall of the nozzle trolley 1, a lead screw is connected to the output shaft of the lifting motor 6, and the lead screw is threadedly connected with the sliding block 5, so that the lifting of the nozzle trolley 1 relative to the sliding block 5 is driven by the rotation of the lead screw. At the same time, since the sliding block 5 drives the nozzle trolley 1 to move transversely along the beam, combined with the longitudinal movement of the beam along the frame, the three-axis movement of the nozzle trolley 1 relative to the printing object is realized.

[0033] In addition, an electrostatic eliminator 7 is arranged on the nozzle trolley 1 to eliminate static electricity of the nozzle trolley 1, so as to avoid the influence of static electricity on ink and powder, thereby ensuring the printing effect and quality. At the same time, a collision prevention mechanism can be arranged on the nozzle trolley 1, such as an optical sensor, which can avoid the collision of the nozzle trolley 1 during movement.

[0034] The printing mechanism 2 is used for printing, and the existing structure is not described here. However, the nozzle adjusting mechanism is provided on the nozzle. The main adjusting components include an internal hexagonal screw, an adjusting support, a nozzle fixing frame, a No. 1 steel ball, a No. 2 steel ball, and a ball plunger. When adjusting the nozzle, the internal hexagonal screw needs to be twisted to press or loosen the No. 1 steel ball (the bottom of the No. 1 steel ball has a spring). At this time, the No. 2 steel ball will be tightly pressed or loosened. The nozzle is adjusted by the steel ball of the ball plunger in the adjusting direction to make the nozzle move left and right and forward and backward. The effect of adjusting and fixing the nozzle is achieved.

[0035] The nozzle trolley 1 is made of carbon fiber. The existing digital printing machine nozzle trolley is assembled and formed by using aluminum plate, steel plate, sheet metal and other metal materials. Not only is the weight high (most of them are above 50 kg), but the assembly precision error exists in the splicing. Due to the high weight and large inertia, the guide rail slider and the driving device are easily worn, the printing speed is slow, the precision is poor, and the printing precision quickly decreases with the increase of the use time. The nozzle trolley 1 of the multifunctional digital printing machine is mainly composed of carbon fiber. The internal body of the nozzle trolley 1 is integrally formed by carbon fiber material. The upper part of the trolley is also a carbon fiber cover made of carbon fiber material. The shell of the nozzle trolley 1 is also integrally formed by carbon fiber. Compared with the existing digital printing machine nozzle trolley, the all-carbon fiber integrated nozzle trolley has a weight of less than 5 kg, an integrally formed super-high precision, and no assembly precision error. The weight is about 1 / 10 of the traditional metal nozzle trolley. Therefore, the motion inertia is extremely small, the wear of the guide rail slider and the driving device is smaller, and finally the high-speed and high-precision inkjet printing effect is achieved.

[0036] Based on the above technical features, the digital printing machine nozzle assembly is provided with the powder scattering mechanism 3 on both sides of the printing mechanism 2 on the nozzle trolley 1. Therefore, the powder scattering mechanism 3 is combined with the printing assembly to complete the integration of powder scattering and digital printing. Not only can the printing effect of the product be better guaranteed, but also the printing process is simplified. At the same time, since it does not need to be repositioned, it can be applied to the printing of various products.

[0037] In the embodiment, the powder scattering mechanism 3 is installed on the nozzle trolley 1. Therefore, the driving of the powder scattering mechanism 3 and the nozzle trolley 1 is common. The powder scattering mechanism 3 is arranged on the left and right sides of the nozzle trolley 1. There are multiple powder scattering mechanisms 3 on each side (the number of powder scattering mechanisms 3 can be increased or decreased according to actual needs). The powder used by each powder scattering mechanism 3 can be the same or different. First, the nozzle trolley 1 moves on the marble beam X-axis from left to right and from right to left, thereby printing a layer of varnish (the varnish can be printed thick to show a three-dimensional effect) on the printing object. After the varnish is sprayed, the powder scattering mechanisms 3 on the left and right sides of the nozzle trolley 1 scatter the powder behind the varnish spraying nozzle. Various glittering powder is scattered on the varnish printing place, and the excess dust is sucked away.

[0038] In addition, the suction of the excess dust can be achieved by the structure of the powdering mechanism 3 itself, and a plurality of air suction holes are arranged on the working platform, which are connected with air ducts and fans, and each fan is connected with a dust removal bag. During the powdering process, part of the excess dust is sucked by the powdering mechanism 3, and part of the excess dust will scatter on the working platform through the gap between the substrates. At this time, the air ducts can suck the flash powder scattered on the positioning pin clamp platform, so as to keep the working platform free of excess flash powder.

[0039] As shown in FIG. 3, in order to ensure the powdering effect, the powdering mechanism 3 can be moved in the front-rear direction (longitudinally) to form a wavy powdering effect. Specifically, the inside of the spray head trolley 1 is provided with a mounting plate 8, the mounting plate 8 is provided with a lead screw motor 9 and a guide rail 10, the guide rail 10 is parallel to the lead screw of the lead screw motor 9, a sliding block is slidably connected to the guide rail 10, a sliding block is connected to the sliding block and the nut seat, and the sliding plate is connected to the powdering mechanism. When the lead screw motor 9 is started, the powdering mechanism 3 moves.

[0040] As shown in FIG. 4, the powdering mechanism 3 is arranged on each side of the printing mechanism 2, and a plurality of powdering mechanisms 3 are arranged in a rectangular array. The movement of the powdering mechanism 3 driven by the spray head trolley 1 and the movement of the powdering mechanism 3 itself can achieve a very beautiful three-dimensional space effect on the substrate. The implementation is achieved by performing multiple printing of varnish and different powdering methods to present a variety of visual effects. We take four powdering mechanisms 4 arranged on one side of the spray head trolley 1 as an example to illustrate the implementation.

[0041] The implementation process is as follows: first, the spray head trolley 1 sprays a layer of varnish on the printing material (according to the required thickness), and then the powder scattering mechanism 3 scatters the flash powder. The scattering method can be various combinations, and each time is different powder. The four powder scattering mechanisms 3 on one side of the spray printing trolley 1 can realize four times of scanning printing, each time is different powder, and any combination method can be realized. It can also realize one-time scanning printing and scattering of two or more kinds of powder side by side, such as FIG. 4 ① and ②, ① and ④, ② and ③, ③ and ④, which can realize the effect of up and down rows on the product, and can also realize multi-level three-dimensional effect, such as scanning and printing the first pass varnish (UV resin, transfer glue, gold varnish), scattering a bottom layer of powder (which can be various combinations of powder scattering), and then increasing the varnish nozzle to increase the varnish ink coverage to cover the first layer, and then scattering the powder. This multi-level powder scattering can be two or three layers, increasing the level to realize a powder scattering process with a three-dimensional effect. In the varnish printing area, the area sprayed by the nozzle is relatively wide, and the powder scattering area is relatively narrow compared to the varnish printing area. When the trolley moves from left to right, the first area is sprayed, and the powder scattering mechanism is behind the varnish printing area. When the trolley moves to the rightmost side, the first area is completed and is cured by the UV lamp. At this time, the marble beam moves a certain distance along the Y-axis direction, and then the trolley moves from left to right to spray varnish. At this time, the second area of varnish printing will cover the powder scattering area when the first area is sprayed. This cycle of spraying and scattering powder will make the special combination of various powders be covered layer by layer to present a three-dimensional space effect. The powder exists in the space and presents a beautiful effect. The powder scattering mechanism 3 can alternate or simultaneously scatter powder, which can achieve more diversified and beautiful effects on the surface of the printing material.

[0042] As shown in FIGS. 5-6, in the present embodiment, the powder scattering mechanism 3 includes a powder storage tank 31, a stirring brush 32, and a driving mechanism. The lower end of the powder storage tank 31 is provided with a powder spraying head assembly, the stirring brush 32 is arranged inside the powder storage tank 31 corresponding to the powder spraying head assembly, and the driving mechanism is used to drive the stirring brush 32 to rotate.

[0043] The powder storage tank 31 is also connected with an air pipe joint 35, which is used to connect the gas source to drive the powder to be sprayed out of the powder spraying head assembly. Specifically, the air pipe joint 5 is connected with the gas source, and the gas is blown through the air pipe joint 35 to make the powder storage tank 31 in positive pressure, so that the powder particles are sprayed out of the powder spraying head by air pressure.

[0044] By arranging the stirring brush 32 inside the powder storage tank 31 corresponding to the powder spraying head assembly, and driving the stirring brush 32 to rotate through the driving mechanism, in the powder scattering process, the air pipe joint 35 is connected with the gas source to drive the powder to be sprayed out of the powder spraying head assembly to realize powder scattering, and at the same time, the stirring brush 32 sweeps the powder spraying head assembly to avoid the situation that the powder spraying head assembly is blocked during powder scattering, thereby ensuring the product quality.

[0045] In the embodiment, the cross section of the powder storage tank 31 is circular, the upper end of the powder storage tank 31 is open, and the upper cover 33 is threadedly connected to the opening, that is, the upper cover 33 is detachably connected to the powder storage tank 31. When the powder needs to be added, the upper cover 33 can be opened, and after the powder is added, the upper cover 33 can be closed. The air pipe joint 35 is also arranged on the upper cover 33.

[0046] In the embodiment, the driving mechanism is a rotating motor 34; the rotating motor 34 is arranged in the interior of the powder storage tank 31, specifically, the rotating motor support plate 36 is arranged between the inner wall of the upper cover 33 and the powder storage tank 31. The middle part of the rotating motor support plate 36 is provided with a hole for air entering corresponding to the air pipe joint 35. The interior of the powder storage tank 31 is provided with a rotating motor fixing plate 37 corresponding to the rotating motor support plate 36. The rotating motor support plate 36 and the rotating motor fixing plate 37 are connected through a stud 38, and the rotating motor 34 is fixedly arranged on the rotating motor fixing plate 37. The output shaft of the rotating motor 34 is connected to the stirring brush 32, specifically, the output shaft of the rotating motor 34 is connected to a rotating shaft through a shaft coupling, and the other end of the rotating shaft is connected to the stirring brush 32. At the same time, a sealing sleeve can be arranged between the upper cover 33 and the powder storage tank 31, and the rotating motor support plate 36 is inserted into the sealing sleeve, which not only ensures the sealing between the upper cover 33 and the powder storage tank 31, but also facilitates the installation of the rotating motor support plate 36.

[0047] In addition, since the air pipe joint 35 is also arranged on the upper cover 33, and the rotating motor 34 is arranged in the interior of the powder storage tank 31, in order to avoid the rotating motor 34 affecting the air entering the powder storage tank 31 from the air pipe joint 35, the length of the stud 38 should be greater than the length of the rotating motor 34, so that there is a gap between the bottom of the rotating motor 34 and the rotating motor support plate 36, which does not affect the entry of air.

[0048] In the embodiment, the outer wall of the lower end of the powder storage tank 31 is provided with a powder suction pipe 39, and the powder spraying head assembly is arranged inside the powder suction pipe 39. When the powder spraying head assembly sprays powder, the powder is sprayed from the lower end of the powder suction pipe 39 to the printing substrate. The side wall of the powder suction pipe 39 is provided with a powder discharge port 310 for discharging excess powder. The powder suction pipe 39 is mainly arranged for the structure of the printing machine provided with the inkjet printing assembly. Since the inkjet printing and powder spraying processes are performed on one device, excess dust may contaminate the inkjet printing head during the powder spraying process, causing the inkjet printing head to be blocked. The application connects the powder discharge port 310 to the air suction device through the powder suction pipe 39, so that the excess dust can be sucked out, avoiding the contamination of the inkjet printing head by the dust and ensuring the effect of inkjet printing.

[0049] In the embodiment, the powder spraying head assembly includes a lower cover 311, a powder spraying pipe 312, a powder spraying head 313 and a powder screening net 314 arranged coaxially. The lower cover 311 is connected to the powder storage tank 31. One end of the powder spraying pipe 312 penetrates through the lower cover 311 and is connected to the inside of the powder storage tank 31. The powder spraying head 313 is arranged at the other end of the powder spraying pipe 312. The powder screening net 314 is arranged inside the powder spraying head 313 and located between the inner wall of the powder spraying head 313 and the powder spraying pipe 312. The stirring brush 32 is arranged in the powder spraying pipe 312. When spraying powder, the powder enters the powder spraying pipe 312 from the powder storage tank 31 under the action of the positive pressure of the gas, and then is sprayed from the powder spraying head 313 through the powder screening net 314. The pore size of the powder screening net 314 can be selected as required to ensure the powder spraying effect. The powder spraying head 313 and the powder spraying pipe 312 are connected by threads. When different powder screening nets 314 need to be replaced, the powder spraying head 313 only needs to be disassembled.

[0050] In addition, in order to ensure the sealing between the powder spraying head assembly and the powder storage tank 31 and the connection stability between the powder spraying pipe 312 and the lower cover 311, the lower cover 311 includes a cover body and a surrounding ring protruding from the edge of the cover body. The surrounding ring is threadedly connected to the powder storage tank 31, and a sealing gasket 315 is arranged between the cover body and the powder storage tank 31. The inside of the cover body is provided with a flange nut 316 and a sealing ring 317. The powder spraying pipe 312 is threadedly connected to the flange nut 316. The sealing ring 317 is attached to the flange nut 316 and located between the flange nut 316 and the sealing gasket 315.

[0051] In addition, a sealing ring can also be arranged between the flange nut 316 and the powder spraying net 314 to ensure the overall sealing.

[0052] The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and replacements can be made without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A printhead assembly for a digital printing machine, characterized in that: The device includes a printhead carriage, a powder dispensing mechanism, a drive assembly, and a printing mechanism disposed inside the printhead carriage. The powder dispensing mechanism is located on both sides of the printing mechanism, and a UV curing mechanism is provided between the powder dispensing mechanism and the printing mechanism. A slider is provided on the rear side wall of the printhead carriage, and the slider is used to slide against the crossbeam of the printing machine. The drive assembly is connected to the slider and is used to drive the printhead carriage to move up and down relative to the slider.

2. The printhead assembly of a digital printing press as described in claim 1, characterized in that: The nozzle carriage is equipped with an installation plate, on which a lead screw motor and a guide rail are mounted. The guide rail is parallel to the lead screw of the lead screw motor. A sliding block is slidably connected to the guide rail. A sliding plate is connected to the sliding block and the lead screw seat. The sliding plate is connected to the powder spreading mechanism.

3. The printhead assembly of a digital printing press as described in claim 1, characterized in that: Each side of the printing mechanism has multiple powder-spraying mechanisms, which are arranged in a rectangular array.

4. The printhead assembly of a digital printing press as described in claim 1, characterized in that: The powder-spraying mechanism includes a powder storage tank, a stirring brush, and a driving mechanism. The lower end of the powder storage tank is provided with a powder spraying head assembly. The stirring brush is disposed inside the powder storage tank corresponding to the powder spraying head assembly. The driving mechanism is used to drive the stirring brush to rotate. The powder storage tank is also connected to an air pipe connector, which is used to connect an air source to drive the powder to be sprayed out by the powder spraying head assembly.

5. The printhead assembly of a digital printing press as described in claim 4, characterized in that: The powder storage tank has an opening at the top, and a top cover is threaded onto the opening. The air pipe connector is located on the top cover. The driving mechanism is a rotary motor; the rotary motor is located inside the powder storage tank, and the output shaft of the rotary motor is connected to the stirring brush; A rotating motor support plate is provided inside the top cover and between the inner wall of the top cover and the powder storage tank. A rotating motor fixing plate is provided inside the powder storage tank corresponding to the rotating motor support plate. The rotating motor support plate and the rotating motor fixing plate are connected by studs. The rotating motor is fixed on the rotating motor fixing plate.

6. The printhead assembly of a digital printing press as described in claim 4, characterized in that: The lower end of the powder storage tank is provided with a powder suction pipe on its outer wall, the powder spraying head assembly is located inside the powder suction pipe, and the side wall of the powder suction pipe is provided with a powder discharge port for discharging excess powder.

7. The printhead assembly of a digital printing press as described in claim 4, characterized in that: The powder spraying head assembly includes a lower cover, a powder spraying tube, a powder spraying head, and a powder sieve arranged coaxially. The lower cover is connected to the powder storage tank. One end of the powder spraying tube passes through the lower cover and communicates with the inside of the powder storage tank. The powder spraying head covers the other end of the powder spraying tube. The powder sieve is disposed inside the powder spraying head and is located between the inner wall of the powder spraying head and the powder spraying tube. The stirring brush is disposed inside the powder spraying tube.

8. The printhead assembly of a digital printing press as described in claim 7, characterized in that: The lower cover includes a cover body and a ring protruding from the edge of the cover body. The ring is threadedly connected to the powder storage tank, and a sealing gasket is provided between the cover body and the powder storage tank. The cover is provided with a flange nut and a sealing ring inside. The powder spraying pipe is threaded to the flange nut. The sealing ring fits against the flange nut and is located between the flange nut and the sealing gasket.

9. The printhead assembly of a digital printing press as described in any one of claims 1-8, characterized in that: The drive component is a lifting motor, and a lead screw is connected to the output shaft of the lifting motor. The lead screw is threadedly connected to the slider.

10. The printhead assembly of a digital printing press as described in any one of claims 1-8, characterized in that: The nozzle carriage is equipped with an electrostatic eliminator.

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