A digital printer head assembly

Abstract

This utility model relates to the field of printing press technology and discloses a printhead assembly for a digital printing press. Sliding along the crossbeam of the printing press, it includes a first carriage and a second carriage. The first carriage houses a printing mechanism and a powder spraying mechanism, while the second carriage houses a magnetic attraction mechanism and a curing mechanism. The curing mechanism cures the transfer varnish, and the magnetic attraction mechanism magnetically attracts the magnetic powder. This utility model integrates the powder spraying mechanism with the printing assembly, achieving a unified process of powder spraying and digital printing. This not only better ensures the printing effect but also simplifies the printing process. Furthermore, because it eliminates the need for repeated positioning, it can be applied to printing various products. Additionally, after the printing mechanism sprays varnish, the powder spraying mechanism sprays powder onto the transfer varnish, and then uses a magnet to magnetically attract the magnetic powder, allowing the magnetic powder to achieve different visual effects under different magnetic fields.

Description

Technical Field

[0001] This utility model relates to the field of printing press technology, and in particular to a printhead assembly for a digital printing press. Background Technology

[0002] Currently, in order to improve the visual effect of digital printing products, some products have added powder spraying technology. However, existing digital printing machines require multiple machines to achieve the purpose of increasing the visual effect of the printing process. This means that it is impossible to achieve repeated positioning of all soft materials and irregularly shaped substrates by multiple machines, which cannot meet the printing needs of most products.

[0003] In addition, existing powder spraying processes can only spray conventional glitter, but there is now a type of magnetic powder that can change according to the magnetic field of a magnet, thereby achieving different display effects. For example, light stripes can be displayed on RMB banknotes when viewed from different angles, as well as light pillars displayed on various anti-counterfeiting printing marks, all of which have good visual effects. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a digital printing machine printhead assembly. The powder spraying mechanism is combined with the printing assembly to complete the integration of powder spraying and digital printing, ensuring product quality and being applicable to the printing of various products. At the same time, by utilizing the effect of magnetic powder and magnets, more visual effect patterns can be achieved.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A printhead assembly for a digital printing machine is slidably connected to the crossbeam of the printing machine. It includes a first carriage and a second carriage. The first carriage is equipped with a printing mechanism and a powder spraying mechanism. The second carriage is equipped with a magnetic attraction mechanism and a curing mechanism. The curing mechanism is used to cure transfer varnish, and the magnetic attraction mechanism is used to magnetically attract magnetic powder.

[0007] Preferably, the crossbeam includes a first crossbeam and a second crossbeam, with the first trolley slidingly connected to the first crossbeam and the second trolley slidingly connected to the second crossbeam.

[0008] Preferably, there is one crossbeam, and the first trolley and the second trolley are respectively slidably connected to both sides of the crossbeam;

[0009] Alternatively, the upper ends of the first trolley and the second trolley can be connected to form a combined trolley, which straddles the crossbeam.

[0010] Preferably, the magnetic attraction mechanism is a magnet, and the curing mechanism is a UV curing lamp.

[0011] Preferably, the magnet is elongated and comprises two oppositely arranged magnets, and the length direction of the magnet is the same as the sliding direction of the slider along the crossbeam, and the UV curing lamp is disposed between the two magnets.

[0012] Preferably, there are two magnets arranged opposite each other, the UV curing lamp is disposed between the two magnets, a connecting plate is connected between the two magnets, a rotating shaft is connected to the middle of the connecting plate, and the axis of the rotating shaft coincides with the center line of the UV curing lamp.

[0013] Preferably, the magnet is annular and can rotate around its center line, the UV curing lamp is disposed in the middle of the magnet, and the center line of the UV curing lamp coincides with the center line of the magnet.

[0014] Preferably, the UV curing lamp has a rotating shaft at its center, and an annular rotating seat is provided at the end of the rotating shaft away from the nozzle carriage. Four connecting rods are arranged in an annular array on the outer wall of the rotating seat, and the other end of the connecting rods is connected to the magnet.

[0015] Preferably, the magnet is an electromagnet, comprising a plurality of magnet units, each of which has a different shape.

[0016] Preferably, the rear sidewalls of the first trolley and the second trolley are provided with sliders, which are used to connect the crossbeam.

[0017] The printhead assembly of a digital printing machine according to this embodiment of the present invention has the following advantages compared with the prior art: by setting the printing mechanism and the powder spraying mechanism inside the first carriage, the powder spraying mechanism, in combination with the printing assembly, completes the integration of powder spraying and digital printing, which not only better ensures the printing effect of the product, but also simplifies the printing process. Furthermore, since it does not require repeated positioning, it can be applied to the printing of various products.

[0018] In addition, a magnetic attraction mechanism is set inside the second carriage to attract magnetic powder, and a curing mechanism is set to cure the transfer varnish. After the inkjet printing mechanism sprays the varnish, the powder spraying mechanism sprays powder on the transfer varnish, and then the magnetic powder is attracted by a magnet, so that the magnetic powder achieves different visual effects under the action of different magnetic fields. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the printhead assembly of a digital printing machine with two crossbeams according to this utility model.

[0020] Figure 2 This is a schematic diagram of the structure of a digital printing press printhead assembly with a single crossbeam, according to this utility model.

[0021] Figure 3This is a schematic diagram of the first structure of the magnetic curing device of this utility model.

[0022] Figure 4 This is a schematic diagram of the second structure of the magnetic curing device of this utility model.

[0023] Figure 5 This is a schematic diagram of the third structure of the magnetic curing device of this utility model.

[0024] Figure 6 This is a schematic diagram of the fourth structure of the magnetic curing device of this utility model.

[0025] Wherein: 1-first carriage, 2-second carriage, 3-printing mechanism, 4-powder spraying mechanism, 5-UV curing lamp, 6-magnet, 7-slider, 8-crossbeam. Detailed Implementation

[0026] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0027] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figure 1-2As shown, a preferred embodiment of this utility model provides a digital printing machine printhead assembly that can be slidably mounted on the crossbeam 8 of the printing machine, such as by using a linear motor. The crossbeam 8 is longitudinally movable on the frame of the digital printing machine; this is prior art and will not be described further here. The digital printing machine printhead includes a first carriage 1 and a second carriage 2. The first carriage 1 has a printing mechanism 3 and a powder spraying mechanism 4 inside. The printing mechanism 3 can print color ink and varnish, and is located in the middle of the first carriage 1. The powder spraying mechanisms 4 are located on both sides of the printing mechanism 3. The second carriage 2 has a magnetic attraction mechanism and a curing mechanism inside. The curing mechanism is used to cure the transfer varnish, and the magnetic attraction mechanism is used to magnetically attract magnetic powder.

[0030] The rear sidewalls of the first carriage 1 and the second carriage 2 are equipped with sliders 7, and the crossbeam 8 is provided with a slide rail that cooperates with the sliders 7. A driving mechanism, such as a lead screw, is connected to the sliders 7 to drive them to move along the slide rail in the X-axis direction. Simultaneously, the crossbeam 8 can move in the Y-axis direction, allowing different effect patterns to be sprayed as needed during the powder spraying process. By combining the cooperation of the two carriages, various shapes, text, numbers, light pillars, circles, breakpoints, and other visual effects patterns can be created.

[0031] In addition, an electrostatic eliminator can be installed on the carriage to eliminate static electricity and prevent it from affecting the ink and powder, thus ensuring printing effect and quality. At the same time, anti-collision mechanisms, such as photoelectric sensors, can be installed on the carriage to prevent collisions during movement.

[0032] The printing mechanism 3 is used for printing and is an existing structure, which will not be described in detail here. However, its printhead is equipped with a printhead adjustment mechanism. The main adjustment components include an internal hex screw, an adjustment bracket, a printhead fixing frame, a No. 1 steel ball, a No. 2 steel ball, and a ball plunger. When adjusting the printhead, the internal hex screw needs to be turned down to press or release 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 press against or release the printhead. Then, the steel ball of the ball plunger, which adjusts the direction, will make the printhead move slightly left, right, forward and backward, so as to achieve the effect of adjusting and fixing the printhead.

[0033] The carriage is made of carbon fiber. Existing digital printing press printhead carriages are assembled from aluminum plates, steel plates, sheet metal, and other metal materials, which not only results in high weight (most exceeding 50KG) but also introduces assembly precision errors. Due to their high weight and large inertia, the guide rails, sliders, and drive devices experience significant wear, leading to slow printing speeds, poor precision, and a rapid decrease in printing precision over time. This multi-functional digital printing press printhead carriage 1 is primarily composed of carbon fiber. The carriage's internal body is integrally molded from carbon fiber, as is the upper part with a carbon fiber cover and the outer shell. Compared to existing digital printing press printhead carriages, our all-carbon fiber integrated printhead carriage weighs less than 5KG, features ultra-high precision molding, and eliminates assembly precision errors. Its weight is approximately 1 / 10 of that of traditional metal printhead carriages, resulting in extremely low motion inertia and less wear on the guide rails, sliders, and drive devices, ultimately achieving high-speed, high-precision inkjet printing.

[0034] Based on the aforementioned technical features, the digital printing press printhead assembly integrates a printing mechanism 3 and a powder spraying mechanism 4 within the first carriage 1. This allows the powder spraying mechanism 4 to combine with the printing assembly 3, achieving integrated powder spraying and digital printing. This not only better ensures the printing effect but also simplifies the printing process. Furthermore, because it eliminates the need for repeated positioning, it can be applied to the printing of various products.

[0035] In addition, a magnetic attraction mechanism is set inside the second carriage 2 to attract magnetic powder, and a curing mechanism is set to cure the transfer varnish. When the inkjet printing mechanism sprays varnish, the powder spraying mechanism sprays powder on the transfer varnish, and then the magnetic powder is attracted by a magnet, so that the magnetic powder achieves different visual effects under the action of different magnetic fields.

[0036] In this embodiment, the magnetic attraction mechanism is a magnet 6, and the curing mechanism is a UV curing lamp 5. Since magnetic powder can produce different visual effects depending on the direction of magnetic attraction, various magnetic attraction methods are needed to diversify this printing powder spraying effect. For example, magnetic optical powder can create beautiful optical gradient effects by changing the attraction of the magnetic field. Several structures of magnetic curing devices are listed below:

[0037] For the first structure, please refer to the appendix. Figure 3 The magnet 6 is elongated and consists of two oppositely arranged magnets. The length direction of the magnet 6 is the same as the sliding direction of the slider 5 along the crossbeam. The UV curing lamp 5 is positioned between the two magnets 6. The magnets 6 move at a certain position and cure the transfer varnish containing magnetic powder, creating a column of light effect.

[0038] For the second structure, please refer to the appendix. Figure 4The magnets 6 are arranged in two opposite directions, and the UV curing lamp 5 is positioned between the two magnets 6. A connecting plate connects the two magnets 6, and a rotating shaft is connected to the middle of the connecting plate. The axis of the rotating shaft coincides with the center line of the UV curing lamp 5. That is, the two magnets can rotate, and the UV curing lamp 5 is at the center of rotation, thus creating a spiral-shaped light arc.

[0039] For the third structure, please refer to the appendix. Figure 5 The magnet 6 is ring-shaped and can rotate around its center line. The UV curing lamp 5 is located in the middle of the magnet 6, and the center line of the UV curing lamp 5 coincides with the center line of the magnet 6. The magnet 6 can move up and down and follow the nozzle carriage 1, while also rotating itself. This allows for intermittent magnetic attraction, creating a discontinuous visual effect on the product.

[0040] For the fourth structure, please refer to the appendix. Figure 6 The UV curing lamp 5 has a central rotating shaft. At the end of the rotating shaft furthest from the nozzle carriage 1, there is an annular rotating seat. Four connecting rods are arranged in a circular array on the outer wall of the rotating seat. The other end of each connecting rod is connected to the magnet 6. The magnet 6 can also be an electromagnet, which can be used to create intermittent magnetism to achieve different visual effects.

[0041] The above structures all achieve different magnetic fields by placing magnets 6 in different directions and ways, as well as by axial and radial magnetization. Different magnetic powder optical effects are achieved by swinging and rotating the magnetic field left, right, up, down, forward, and backward at different angles and speeds. The magnetic powder optical effects are then cured and fixed under the action of UV curing lamp 5.

[0042] The fifth structure is that the magnet 6 is an electromagnet, which includes several magnet units. Each magnet unit has a different shape, such as numbers, patterns, circles, triangles, polygons, etc., so that the magnets of the corresponding patterns can be selected according to actual needs to print various products.

[0043] In addition, the UV curing lamp 5 can be used to achieve various effects. Specifically, the UV curing lamp 5 can utilize multiple light sources to achieve multiple effects. It can use a large light source, or a precisely controlled fine laser UV spot with software-controlled high-speed galvanometer to achieve fine curing and shaping, or a combination of both. For example, by first curing fine text images in front of a magnetic field with laser UV, and then curing them with a regular UV lamp within the magnetic field, a contrast can be achieved between the magnetic powder optical effects of the text images and the surrounding magnetic powder optical effects. The two light sources can be used interchangeably or individually. This method achieves different visual effects by controlling and changing the light source to achieve different curing effects.

[0044] In this embodiment, the crossbeam 8 can be two or one. For example... Figure 1 As shown, when two are used, they are first defined as the first crossbeam and the second crossbeam respectively. The first trolley 1 slides on the first crossbeam, and the second trolley 2 slides on the second crossbeam, that is, the two trolleys do not affect each other.

[0045] like Figure 2 As shown, when there is only one crossbeam 8, the first trolley 1 and the second trolley 2 may not be connected, but can be slidably connected to both sides of the crossbeam 8 respectively;

[0046] Alternatively, the upper ends of the first trolley 1 and the second trolley 2 can be connected to form a combined trolley, which straddles the crossbeam 8 and moves together.

[0047] The working steps of the printhead assembly of the digital printing machine of this utility model are as follows: First, the printing mechanism 3 sprays transfer varnish (UV resin, transfer glue, hot stamping varnish) onto the substrate. Second, the powder spraying mechanism 4 sprays magnetic powder onto the transfer varnish as the carriage moves, spraying single or multiple layers of powder as required. Third, the magnet 6 is used above the magnetic powder, or rotated, or controlled by the magnet 6's magnetism, and during the movement of the carriage, the magnetic powder sprayed onto or inside the transfer varnish is magnetically attracted, so that the magnetic powder achieves different visual effects under the action of different magnetic fields. Fourth, the UV curing lamp 5 is used to cure the treated transfer varnish containing magnetic powder, completing the magnetic powder spraying process.

[0048] It should be noted that there are various powder spraying methods, such as spraying glitter into the interlayer between inks or printing glitter onto the outer surface. When spraying glitter onto the surface, it is necessary to spray the glitter onto the substrate after the varnish or ink has been applied but before it has cured, allowing the glitter to adhere, and then allowing it to cure.

[0049] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A printhead assembly for a digital printing machine, slidably connected to the crossbeam of the printing machine, characterized in that: It includes a first carriage and a second carriage. The first carriage is equipped with a printing mechanism and a powder spraying mechanism. The second carriage is equipped with a magnetic attraction mechanism and a curing mechanism. The curing mechanism is used to cure the transfer varnish, and the magnetic attraction mechanism is used to magnetically attract the magnetic powder.

2. The printhead assembly of a digital printing press as described in claim 1, characterized in that: The crossbeam includes a first crossbeam and a second crossbeam, with the first trolley sliding on the first crossbeam and the second trolley sliding on the second crossbeam.

3. The printhead assembly of a digital printing press as described in claim 1, characterized in that: There is one crossbeam, and the first trolley and the second trolley are respectively slidably connected to both sides of the crossbeam; Alternatively, the upper ends of the first trolley and the second trolley can be connected to form a combined trolley, which straddles the crossbeam.

4. The printhead assembly of a digital printing press as described in any one of claims 1-3, characterized in that: The rear sidewalls of the first trolley and the second trolley are provided with sliders, which are used to connect the crossbeam.

5. The printhead assembly of a digital printing press as described in claim 4, characterized in that: The magnetic attraction mechanism is a magnet, and the curing mechanism is a UV curing lamp.

6. The printhead assembly of a digital printing press as described in claim 5, characterized in that: The magnet is elongated and consists of two oppositely arranged magnets. The length direction of the magnet is the same as the sliding direction of the slider along the crossbeam. The UV curing lamp is disposed between the two magnets.

7. The printhead assembly of a digital printing press as described in claim 5, characterized in that: The magnets are two oppositely arranged, and the UV curing lamp is placed between the two magnets. A connecting plate connects the two magnets, and a rotating shaft is connected to the middle of the connecting plate. The axis of the rotating shaft coincides with the center line of the UV curing lamp.

8. The printhead assembly of a digital printing press as described in claim 5, characterized in that: The magnet is ring-shaped and can rotate around its center line. The UV curing lamp is located in the middle of the magnet, and the center line of the UV curing lamp coincides with the center line of the magnet.

9. The printhead assembly of a digital printing press as described in claim 5, characterized in that: The UV curing lamp has a rotating shaft at its center, and an annular rotating seat is located at the end of the rotating shaft away from the first trolley. Four connecting rods are arranged in an annular array on the outer wall of the rotating seat, and the other end of the connecting rods is connected to the magnet.

10. The printhead assembly of a digital printing press as described in claim 5, characterized in that: The magnet is an electromagnet, comprising several magnet units, each with a different shape.

Images