Automatic roll changing and splicing device for inkjet digital printing base film

Abstract

This invention relates to an automatic roll-changing and splicing feeding device for inkjet digital printing base film, comprising: a feeding rack; a receiving unit; and a cutting unit. On the one hand, this invention enables precise alignment and bonding of new and old base films, ensuring that the transmission position of the base film remains unchanged before and after roll changing, thereby improving the accuracy of subsequent printing positions and effectively increasing product yield. On the other hand, it greatly simplifies the roll-changing and splicing steps, enabling the changing and splicing of two rolls of base film without stopping the machine. The operation is simple and convenient, effectively improving efficiency while reducing the probability of base film contamination and improving printing quality.

Description

Technical Field

[0001] This invention belongs to the field of printing technology, specifically relating to a feeding device for automatic roll changing and splicing of base film suitable for inkjet digital printing. Background Technology

[0002] With the development of information technology and digitalization, inkjet digital printing technology has become an important technical means in the printing industry. Digital inkjet printing technology has advantages such as high efficiency, environmental friendliness, and economy, and therefore has been widely used in advertising, publishing, decoration, textiles and other fields.

[0003] Currently, in traditional inkjet digital printing equipment, a single roll of base film is set on a single unwinding roller. As the unwinding roller rotates, the base film is continuously transported to the printing station in front. When the roll of base film is used up, the printing equipment needs to be paused, the base film is manually cut and the empty roll is removed, and a new roll of base film is fitted onto the unwinding roller. Finally, the new roll of base film is bonded to the base film in front from the end, and the machine can be restarted for printing production.

[0004] However, in actual production, this material supply method has the following technical defects:

[0005] 1. When the new roll is joined with the front bottom film, the bottom film is easily deformed by force, making it difficult to ensure that the sides of the new roll bottom film are accurately aligned with the front bottom film. During feeding, the transmission position of the new roll bottom film is prone to deviation, which leads to errors in the subsequent printing position and a low product yield.

[0006] 2. Manual roll changing and material receiving are not only cumbersome and time-consuming, resulting in low roll changing efficiency and affecting production efficiency, but also require workers to frequently touch the base film, which can easily cause contamination of the base film surface and thus affect the subsequent printing quality. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a brand-new automatic roll changing and continuous splice feeding device for inkjet digital printing.

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] An automatic film feeding device for inkjet digital printing, comprising:

[0010] The feeding rack has two unwinding stations located on the front and rear sides, each of which is equipped with unwinding rollers extending to the left and right, and the bottom film is conveyed upward from the corresponding unwinding roller.

[0011] The receiving unit includes an auxiliary frame disposed between two unwinding stations, a pressing component and a positioning component disposed above the unwinding roller, wherein the pressing component is used to drive the bottom film on the front and rear sides to abut against the auxiliary frame respectively; the positioning component has a positioning surface formed thereon, and the new bottom film is positioned on the positioning surface from the end, and during the movement of the positioning component, the new bottom film located on the positioning surface gradually becomes parallel to the old bottom film on the other side, so that the new bottom film is aligned with the old bottom film from the opposite sides and adheres to the old bottom film from the end;

[0012] The cutting unit includes a cutting component movably disposed above the unwinding roller, which cuts the old base film during left-right movement.

[0013] According to a specific embodiment and preferred aspect of the present invention, the auxiliary frame includes a vertically extending backing plate, with the front and rear bottom films respectively abutting against the front and rear sides of the backing plate. This not only facilitates precise alignment of the front and rear bottom films but also ensures that the transport state of the bottom films remains unchanged after roll changing, guaranteeing stable printing quality.

[0014] Preferably, the pressing component includes pressure rollers symmetrically arranged on the front and rear sides of the backing plate, and a flipping power component connected to both ends of the pressure rollers and capable of driving the pressure rollers to flip up and down to move closer to or away from the backing plate. This design is simple and facilitates tightening or loosening of the bottom film as needed.

[0015] Preferably, each pressure roller extends downwards and from left to right. During initial unwinding, the end of the bottom film gradually enters the space between the pressure roller and the backing plate from right to left. Here, as the bottom film is gradually wound between the pressure roller and the backing plate, its own tension gradually increases during the conveying of the bottom film. This facilitates stable output of the bottom film during initial unwinding and also provides sufficient time for manual intervention to correct deviations, thereby improving the accuracy of the bottom film's output position.

[0016] According to another specific embodiment and preferred aspect of the invention, the positioning component is connected to the pressure roller, and as the pressure roller moves, the positioning component moves synchronously closer to or further away from the backing plate. Here, when the pressure roller is lowered, the positioning component moves synchronously away from the backing plate, thereby providing sufficient space for manual operation.

[0017] Preferably, the positioning component includes a flipping seat rotatably connected to both ends of the pressure roller, a positioning element disposed on the flipping seat and having a positioning surface, and a flipping drive element for driving the flipping seat to flip up and down around the center line of the pressure roller. As the flipping seat moves, the positioning surface is attached to or detached from the corresponding side of the backing plate.

[0018] Specifically, the positioning component is a hollow cuboid capable of creating negative pressure. Multiple pores are distributed on one side wall of the positioning component to form a negative pressure zone on its surface. During fixing, the new substrate adheres to the negative pressure zone from its end. This method is simple and convenient, and avoids substrate deformation.

[0019] Furthermore, the flipping power component includes support shafts located at the left and right ends of the pressure roller and offset vertically from the pressure roller, and a connecting module connecting the support shafts and the pressure roller.

[0020] According to another specific embodiment and preferred aspect of the invention, the cutting component includes a blade holder that reciprocates along the top edge of the backing plate, and a cutting wheel rotatably connected to the blade holder about its own centerline. During cutting, the edge of the cutting wheel presses against the top edge of the backing plate to form a cutting force for cutting the bottom film, and the bottom film is cut during the rotation of the cutting wheel and the movement of the blade holder. Here, the bottom film can be cut quickly without causing deformation of the bottom film.

[0021] Preferably, the top edge of the backing plate extends downwards and from left to right; and / or, the cutting unit further includes a guide rail and a driving component parallel to the top edge of the backing plate, wherein the blade holder is slidably connected to the guide rail, and the driving component drives the blade holder to reciprocate along the guide rail; and / or, the left and right sides of the blade holder are respectively provided with tension screws, and a steel wire rope is connected between the tension screws, wherein the steel wire rope is wound around the wheel surface of the blade wheel, and during the left and right movement of the blade holder, the steel wire rope can synchronously drive the blade wheel to rotate in the forward or reverse direction. Here, while realizing the synchronous movement of the blade holder and the blade wheel, it can also automatically drive the blade wheel to rotate in the reverse direction as the direction of movement of the blade holder changes, thereby enabling the blade wheel to cut the bottom film during left or right movement.

[0022] Furthermore, the positioning and cutting components form a roll changing and splicing group, of which there are two symmetrically arranged on the front and rear sides of the auxiliary frame. Here, provided that empty rolls are replaced manually and new rolls are replenished promptly, continuous material feeding without stopping the machine can be achieved through the cooperation of the two unwinding stations.

[0023] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0024] Existing feeding equipment suffers from drawbacks during roll changing and material receiving, including misalignment between the old and new base films leading to printing errors, and susceptibility to base film contamination affecting printing quality. Furthermore, it is cumbersome to operate, resulting in low roll changing and production efficiency. This application addresses these shortcomings by redesigning the feeding equipment's structure. With this new feeding equipment, when a roll is nearly exhausted, the old and new base films are held against the auxiliary frame, and the end of the new base film is positioned on the positioning surface. The movement of the positioning components ensures the new base film is parallel to the old base film. Finally, adjustments are made to align the new base film with the old base film from opposite sides. The old base film is aligned and bonded to the old base film from the end; the old base film is cut by the cutting component moving in the left and right direction, completing the roll change and splicing. Therefore, compared with the prior art, this invention can achieve precise alignment and bonding of the old and new base films, thereby ensuring that the transmission position of the base film remains unchanged before and after the roll change, which is conducive to improving the accuracy of the subsequent printing position and effectively improving the product yield. On the other hand, it greatly simplifies the roll change and splicing steps, and can realize the roll change and splicing of two rolls of base film without stopping the machine. The operation is simple and convenient, effectively improving efficiency, while reducing the probability of base film contamination and improving printing quality. Attached Figure Description

[0025] Figure 1 This is a front view schematic diagram of an automatic roll-changing and continuous splice feeding device for inkjet digital printing.

[0026] Figure 2 for Figure 1 A schematic diagram of the left view (partially omitted);

[0027] Figure 3 for Figure 1 A partial structural diagram;

[0028] Among them: 1. Feeding rack; g1. Unwinding roller; g2. Transfer roller;

[0029] 2. Receiving unit; 20. Auxiliary frame; 200. Backing plate; 201. Clamping block; 21. Pressing component; 210. Pressure roller; 211. Tilting power component; a0. Support shaft; a1. Connecting module; 22. Positioning component; 220. Tilting seat; 221. Positioning element; m. Positioning surface; 222. Tilting drive component;

[0030] 3. Cutting unit; 30. Cutting component; 300. Blade holder; 301. Blade wheel; j. Tightening screw; s. Wire rope; 31. Guide rail; 32. Drive component. Detailed Implementation

[0031] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the application will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0032] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly 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 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0037] Combination Figures 1 to 3 As shown, the automatic roll changing and continuous feeding device for the base film of inkjet digital printing in this embodiment includes a feeding rack 1, a receiving unit 2, and a cutting unit 3.

[0038] Specifically, the feed rack 1 has two unwinding stations located on the front and rear sides. Each unwinding station is equipped with an unwinding roller g1 extending to the left and right. Above the unwinding roller g1, there are multiple transfer rollers g2. As the transfer rollers g2 rotate, the bottom film is transferred upward from the corresponding unwinding roller g1. At the same time, the rolls of material on the two unwinding rollers g1 are aligned in the front-to-back direction.

[0039] In this example, the receiving unit 2 includes an auxiliary frame 20 disposed between two unwinding stations, a pressing component 21 and a positioning component 22 disposed above the unwinding roller g1, respectively. The pressing component 21 is used to drive the bottom film on the front and rear sides to abut against the auxiliary frame 20. The positioning component 22 has a positioning surface m formed on it. The new bottom film is positioned on the positioning surface m from the end. During the movement of the positioning component 22, the new bottom film located on the positioning surface m gradually becomes parallel to the old bottom film on the other side, so that the new bottom film is aligned with the old bottom film from the opposite sides and bonded to the old bottom film from the end. The bonding of the two is completed manually using tape.

[0040] In some specific embodiments, the auxiliary frame 20 includes a vertically extending back plate 200, clamping blocks 201 respectively disposed on the left and right sides of the back plate 200 and clamping the back plate 200 in the front-back direction, and the bottom film on the front and back sides respectively abutting against the front and back sides of the back plate 200.

[0041] The pressing component 21 includes pressing rollers 210 symmetrically arranged on the front and rear sides of the backing plate 200, and a flipping power component 211 connected to both ends of the pressing rollers 210 and capable of driving the pressing rollers 210 to flip up and down to move closer to or away from the backing plate 200. Each pressing roller 210 extends from left to right and downward at an angle. During the initial unwinding, the end of the bottom film gradually enters the space between the pressing rollers 210 and the backing plate 200 from right to left. The flipping power component 211 includes a support shaft a0 located at the left and right ends of the pressing rollers 210 and offset vertically from the pressing rollers 210, and a connecting module a1 connected between the support shaft a0 and the pressing rollers 210.

[0042] The positioning component 22 is connected to the pressure roller 210, and as the pressure roller 210 moves, the positioning component 22 synchronously moves closer to or further away from the backing plate 200. In some specific embodiments, the positioning component 22 includes a flipping seat 220 rotatably connected to both ends of the pressure roller 210, a positioning element 221 disposed on the flipping seat 220 and having a positioning surface m, and a flipping drive element 222 for driving the flipping seat 220 to flip up and down around the center line of the pressure roller 210. As the flipping seat 220 moves, the positioning surface m adheres to or detaches from the corresponding side of the backing plate 200. The positioning element 221 is a hollow cuboid capable of forming a negative pressure, and multiple air holes are distributed on one side wall of the positioning element 221 to form a negative pressure area on its surface. When fixed, the new bottom film is laid flat from the end and adsorbed into the negative pressure area. The flipping drive element 222 is a cylinder.

[0043] In this example, the cutting unit 3 includes a cutting component 30 that is movably disposed above the unwinding roller g1. During left-right movement, the cutting component 30 cuts the old base film.

[0044] Specifically, the cutting component 30 includes a blade holder 300 that reciprocates along the top edge of the backing plate 200, and a blade wheel 301 rotatably connected to the blade holder 300 around its own centerline. During cutting, the edge of the blade wheel 301 presses against the top edge of the backing plate 200, forming a cutting force to cut the base film. The base film is cut during the rotation of the blade wheel 301 and the movement of the blade holder 300. In some embodiments, a tensioning screw j is provided on the left and right sides of the blade holder 300, and a steel wire rope s is connected between the tensioning screws j. The steel wire rope s is wound around the wheel surface of the blade wheel 301, and during the left and right movement of the blade holder 300, the steel wire rope s can synchronously drive the blade wheel 301 to rotate in the forward or reverse direction. In other embodiments, a rope pulley is also provided on the blade holder 300 to facilitate adjusting the direction of the steel wire rope s and successfully winding it around the blade wheel 301.

[0045] Furthermore, the top edge of the backing plate 200 extends downward from left to right; the cutting unit 3 also includes a guide rail 31 parallel to the top edge of the backing plate 200 and a driving component 32, wherein the blade holder 300 is slidably connected to the guide rail 31, and the driving component 32 adopts a rodless cylinder and is used to drive the blade holder 300 to reciprocate left and right along the guide rail 31.

[0046] In addition, the aforementioned positioning component 22 and cutting component 30 constitute a roll changing and splicing group, and there are two roll changing and splicing groups symmetrically arranged on the front and rear sides of the auxiliary frame 20.

[0047] In summary, by adopting this feeding device, when a roll of material is about to run out, the new and old base films are kept against the auxiliary frame, and the end of the new base film is positioned on the positioning surface. During the movement of the positioning component, the new base film is made parallel to the old base film. Finally, through adjustment, the new base film is aligned with the old base film from opposite sides and bonded to the old base film from its end. The cutting component cuts the old base film in a left-right direction, completing the roll change and splicing. Therefore, compared with the prior art, this invention, on the one hand, can achieve precise alignment and bonding of the new and old base films, thus ensuring that the transmission position of the base film remains unchanged before and after roll change, thereby improving the accuracy of subsequent printing positions and effectively increasing the product yield. On the other hand, it greatly simplifies the roll change and splicing steps, enabling the change and splicing of two rolls of base film without stopping the machine. The operation is simple and convenient, effectively improving efficiency, while reducing the probability of base film contamination and improving printing quality. Thirdly, it not only facilitates precise alignment of the front and rear base films, but also... Furthermore, it ensures that the transmission state of the base film remains unchanged after roll change, guaranteeing stable printing quality; fourthly, as the base film is gradually wound between the pressure roller and the backing plate, its own tension gradually increases during transport, facilitating stable output of the base film during initial unwinding and providing sufficient time for manual intervention to correct deviations, thereby improving the accuracy of the base film output position; fifthly, when the pressure roller is lowered, the positioning component moves away from the backing plate synchronously, providing sufficient space for manual operation; sixthly, through the cooperation between the cutter wheel, cutter holder, and backing plate, the base film can be quickly cut without deformation. Simultaneously, when the cutter holder and cutter wheel move synchronously, the cutter wheel can be automatically driven to rotate in the opposite direction as the cutter holder moves, enabling the cutter wheel to cut the base film whether moving left or right; seventhly, provided that empty rolls are replaced and new rolls are replenished manually in a timely manner, continuous material supply without stopping the machine can be achieved through the cooperation of two unwinding stations.

[0048] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A feeding device for automatic roll changing and splicing of base film suitable for inkjet digital printing, characterized in that, It includes: The feeding rack has two unwinding stations located on the front and rear sides, each of which is provided with an unwinding roller extending to the left and right, and the bottom film is conveyed upward from the corresponding unwinding roller; The receiving unit includes an auxiliary frame disposed between the two unwinding stations, a pressing component and a positioning component respectively disposed above the unwinding roller, wherein the pressing component is used to drive the front and rear bottom films to abut against the auxiliary frame respectively; the positioning component has a positioning surface formed thereon, and the new bottom film is positioned on the positioning surface from the end, and during the movement of the positioning component, the new bottom film on the positioning surface gradually becomes parallel to the old bottom film on the other side, so that the new bottom film is aligned with the old bottom film from the opposite sides and adheres to the old bottom film from the end; the auxiliary frame includes a vertically extending back plate, and the front and rear bottom films abut against the front and rear sides of the back plate respectively; the pressing component includes pressure rollers symmetrically disposed on the front and rear sides of the back plate, and a flipping power component connected to the two ends of the pressure rollers and capable of driving the pressure rollers to flip up and down to move closer to or away from the back plate; each pressure roller extends from left to right and downwards at an angle, and during the initial unwinding, the end of the bottom film gradually enters the space between the pressure roller and the back plate from right to left; The cutting unit includes a cutting component movably disposed above the unwinding roller, which cuts the old base film during left-right movement.

2. The automatic roll changing and splicing feeding device for inkjet digital printing of base film according to claim 1, characterized in that, The positioning component is connected to the pressure roller, and as the pressure roller moves, the positioning component moves closer to or further away from the backing plate.

3. The automatic roll changing and splicing feeding device for inkjet digital printing according to claim 2, characterized in that, The positioning component includes a flipping seat rotatably connected to both ends of the pressure roller, a positioning element disposed on the flipping seat and having the positioning surface formed thereon, and a flipping drive element for driving the flipping seat to flip up and down around the center line of the pressure roller. As the flipping seat moves, the positioning surface is attached to or detached from the corresponding side of the backing plate.

4. The automatic roll changing and splicing feeding device for inkjet digital printing of base film according to claim 3, characterized in that, The positioning component is a hollow cuboid capable of forming a negative pressure, and multiple air holes are distributed on one side wall of the positioning component to form a negative pressure zone on its surface. When fixed, the new bottom film is adsorbed into the negative pressure zone from the end; and / or, the flipping power component includes a support shaft located at the left and right ends of the pressure roller and offset vertically from the pressure roller, and a connecting module connected between the support shaft and the pressure roller.

5. The automatic roll changing and splicing feeding device for inkjet digital printing according to claim 1, characterized in that, The cutting component includes a blade holder that reciprocates along the top edge of the backing plate and a cutting wheel that rotates around its own center line and is connected to the blade holder. During cutting, the edge of the cutting wheel is pressed against the top edge of the backing plate and a cutting force is formed to cut the bottom film. The bottom film is cut by the rotation of the cutting wheel and the movement of the blade holder.

6. The automatic roll changing and splicing feeding device for inkjet digital printing of base film according to claim 5, characterized in that, The top edge of the backing plate extends downwards from left to right; and / or, the cutting unit further includes a guide rail and a driving component parallel to the top edge of the backing plate, wherein the blade holder is slidably connected to the guide rail, and the driving component drives the blade holder to reciprocate along the guide rail; and / or, tension screws are respectively provided on the left and right sides outside the blade holder, and a steel wire rope is connected between the tension screws, wherein the steel wire rope is wound around the wheel surface of the blade wheel, and during the left and right movement of the blade holder, the steel wire rope can synchronously drive the blade wheel to rotate in the forward or reverse direction.

7. The automatic roll-changing and splicing feeding device for base film suitable for inkjet digital printing according to any one of claims 1-6, characterized in that, The positioning component and the cutting component constitute a roll changing and splicing group, and there are two roll changing and splicing groups symmetrically arranged on the front and rear sides of the auxiliary frame.

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