Printing press

Abstract

A printing machine, comprising unwinding device, printing device and winding device with differential transmission function, the unwinding device and printing device are provided with tensioning device, printing device includes several printing roller, each printing roller is printed with the required part or all of the pattern of the material belt, the tensioning device and unwinding device are provided with always in rotating state full printing roller group, full printing roller group includes the ink roller group on which the ink is printed and the printing roller driven by the ink roller group to rotate, the printing roller is provided with several printing parts, one end of printing part abuts on the ink roller, the other end abuts on the material belt.The beneficial effects of the present application are: the ink roller group in the full printing roller group and the printing roller cooperate, one end of the printing part on the printing roller dips the ink on the ink roller, the other end is closely abutted on the material belt, so that continuous uninterrupted printing can be formed on the material belt.

Description

Technical Field

[0001] This utility model relates to a printing device, and more particularly to a printing press. Background Technology

[0002] A printing press that uses differential speed to print on plastic bags mainly consists of an unwinding device, a printing device, a differential speed transmission mechanism, and a rewinding device. The unwinding device releases the plastic bag, and the printing device prints the pattern. The differential speed transmission mechanism creates a speed difference between the printing roller and the plastic bag, ensuring printing accuracy. The rewinding device collects the printed plastic bag. Its advantages include adaptability to plastic bags of different materials and thicknesses, high printing precision, prevention of blurry or distorted patterns, and effective improvement of plastic bag printing quality and efficiency. It is widely used in the packaging printing industry.

[0003] Differential printing methods have limitations in plastic bag printing, making it difficult to achieve full-coverage printing. Due to the characteristics of the differential mechanism, it is difficult to precisely control ink adhesion at the edges of the plastic bag due to speed differences, leading to uneven ink distribution, missed prints, and other issues that prevent complete coverage of the entire bag surface. This problem is particularly pronounced at irregularly shaped areas such as the bag opening and bottom, severely impacting the overall effect and quality of full-coverage printing on plastic bags. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a printing machine capable of full printing on plastic bags.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A printing machine includes an unwinding device, a printing device, and a rewinding device with differential transmission function. A tensioning device is provided between the unwinding device and the printing device. The printing device includes a plurality of printing rollers, each of which is printed with part or all of the pattern required for the material strip. A fully rotating printing roller assembly is provided between the tensioning device and the unwinding device. The fully rotating printing roller assembly includes an ink roller assembly printed with ink and a printing roller driven by the ink roller assembly. The printing roller is provided with a plurality of printing sections, one end of which abuts against the ink roller and the other end of which abuts against the material strip.

[0006] The beneficial effects of this invention are as follows: This printing press, by incorporating a constantly rotating full-printing roller assembly between the tensioning and unwinding devices, achieves significant advantages through its unique structural design. The ink roller assembly and the printing roller work in tandem within the full-printing roller assembly. One end of the printing section on the printing roller picks up ink from the ink roller, while the other end presses firmly against the material strip, thus creating a continuous and uninterrupted print on the strip. This contrasts sharply with differential printing methods, avoiding problems such as printing interruptions and discontinuous pattern splicing caused by differences in printing methods. It greatly improves the integrity and aesthetics of the print, ensuring a continuous and smooth visual effect on the strip surface, and significantly enhancing the printing quality of the product. Simultaneously, this continuous and stable printing process reduces the defect rate that may result from printing interruptions, improving production efficiency and lowering production costs.

[0007] Furthermore, the full printing roller assembly also includes an ink reservoir, the ink roller assembly includes an immersion roller immersed in the ink reservoir and a coloring roller that rotates with the immersion roller, the coloring roller being in contact with the printing section of the printing roller.

[0008] The ink tank in the entire printing roller assembly provides an ample source of ink for printing, ensuring the continuity of the printing process. The ink roller assembly employs a design where the dip roller is immersed in the ink tank to acquire ink, and then the ink is transferred through contact between the coloring roller, which rotates with the dip roller, and the printing section of the printing roller. This design avoids direct contact between the dip roller and the printing roller. This effectively prevents ink droplets from the ink tank from directly adhering to the printing section, ensuring that the printing section can acquire ink evenly and stably and print it onto the printing strip. This not only improves the uniformity and clarity of the printing, resulting in rich colors and delicate lines on the printing strip, greatly enhancing the visual quality of the printed product, but also reduces pattern defects and scrap rates caused by ink droplet contamination, lowering raw material waste and production costs. Furthermore, the stable and reliable ink transfer system reduces the frequency of downtime for cleaning and maintenance due to ink contamination issues, improving the equipment's operating efficiency and overall stability.

[0009] Furthermore, both ends of the dyeing roller are provided with lifting components, which abut against both ends of the dyeing roller and are used to adjust the depth of the dyeing roller immersed in the ink tank.

[0010] The lifting components at both ends of the immersion rollers in the full printing roller assembly greatly facilitate and enhance the control of ink depth during the printing process. By adjusting the degree of contact between the lifting components and the ends of the immersion rollers, the depth of immersion of the rollers in the ink tank can be changed. This function allows operators to flexibly adjust the ink depth according to the printing requirements of the tape, easily achieving both rich, deep colors and delicate, subtle tones. Precise ink depth control not only significantly improves the color expressiveness and gradation of printed patterns, enabling printed materials to better meet diverse design and aesthetic requirements, but also effectively avoids pattern quality problems caused by excessively dark or light ink application, such as color deviation and blurring, thereby reducing the defect rate and increasing the pass rate and high-quality product rate. Simultaneously, this adjustable design enhances the printing press's adaptability to tapes with different materials and printing process requirements, broadening the equipment's application range and allowing it to demonstrate superior performance and reliability in various printing tasks.

[0011] Furthermore, a pressing and adjusting mechanism is provided on the side of the coloring roller. The pressing and adjusting mechanism includes an adjusting plate with an arc-shaped moving groove and a driving component. One end of the coloring roller extends out from the moving groove and forms a transmission engagement with the driving component.

[0012] The pressing and adjusting mechanism located on the side of the coloring roller in a printing press plays a crucial role. It includes an adjusting plate with an arc-shaped moving groove and a driving component. One end of the coloring roller extends from the moving groove and engages with the driving component. This design allows the driving component to adjust the position of the coloring roller along the arc-shaped moving groove, thereby changing the degree of contact between the coloring roller and the printing section. By flexibly adjusting the degree of contact, the color depth on the printing section can be precisely controlled, meeting the diverse needs of different printed patterns for variations in color intensity.

[0013] Furthermore, the radial extensions at both ends of the coloring roller are provided with clamping members that apply radial pressure to the coloring roller.

[0014] The clamping elements located at both ends of the coloring roller, extending radially, play a crucial role in applying radial pressure to the roller. During printing press operation, this design effectively prevents the coloring roller from bouncing. Bouncing of the coloring roller leads to unstable contact with the printing section of the printing roller, resulting in uneven ink transfer. This affects the consistency and clarity of the printed pattern's colors, easily causing quality problems such as color bleeding and blurred patterns. The constant radial pressure applied by the clamping elements ensures that the coloring roller remains stably and tightly attached to the printing section, guaranteeing uniform and continuous ink transfer. This results in rich, vibrant colors and smooth, even lines on the printing tape, significantly improving printing quality and effect.

[0015] Furthermore, the full printing roller assembly also includes a pressure roller, with the printing roller and the pressure roller respectively abutting against both sides of the material belt, and the printing section and the pressure roller forming an interference fit.

[0016] In the full printing roller assembly, the pressure roller and printing roller abut against both sides of the printing strip, with an interference fit between the printing section and the pressure roller. This design significantly contributes to improving the printing effect. The pressure roller applies pressure from one side of the printing strip, working in conjunction with the printing roller to keep the strip under stable stress during the printing process. The interference fit between the printing section and the pressure roller ensures close and uniform contact between the printing strip and the printing section during printing, effectively avoiding problems such as uneven ink penetration and unclear patterns caused by poor contact.

[0017] Furthermore, a storage roller group is provided between the tensioning device and the printing device. The storage roller group includes several groups of driven rollers, and the driven rollers in the same group are vertically distributed to each other.

[0018] In printing presses, the feed roller assembly located between the tensioning device and the printing unit plays a crucial role. It comprises several vertically distributed driven rollers, one end continuously receiving the feed strip, while the other end outputs the strip at a differential speed. Due to this speed difference, without a corresponding buffer structure, feed strip accumulation can easily occur. This vertically distributed design effectively solves this problem. It absorbs the feed strip accumulation caused by the inconsistent speeds at both ends, ensuring that the feed strip remains in an orderly and smooth state during transmission. This prevents wrinkles, deformation, or tangling caused by feed strip accumulation, which can affect printing quality or even damage the feed strip. Attached Figure Description

[0019] Figure 1 This is an isometric view of an embodiment of the present utility model; Figure 2 This is an isometric view of the entire printing roller assembly according to an embodiment of this utility model; Figure 3 This is a disassembly assembly for the ink roller assembly in an embodiment of this utility model; Figure 4 This is an isometric view of the storage roller assembly in an embodiment of this utility model. Detailed Implementation

[0020] This utility model embodiment includes a printing machine, such as... Figure 1-4As shown: The device includes an unwinding device 1, a printing device 2, and a rewinding device 3 with differential transmission. A tensioning device 4 is provided between the unwinding device 1 and the printing device 2. The printing device 2 includes several printing rollers, each printed with part or all of the pattern required for the material strip. A fully rotating group of printing rollers 5 is provided between the tensioning device 4 and the unwinding device 1. A storage roller group 6 is provided between the tensioning device 4 and the printing device 2. The storage roller group 6 includes several groups of driven rollers 61, which are perpendicularly distributed to each other within the same group.

[0021] The full printing roller assembly 5 includes an ink roller assembly 51 printed with ink, a printing roller 52 driven by the ink roller assembly 51, and a pressure roller 53. The printing roller 52 and the pressure roller 53 respectively abut against both sides of the material belt. The printing roller 52 is provided with a plurality of printing parts 521. One end of the printing part 521 abuts against the ink roller, and the other end forms an interference fit with the pressure roller 53 so as to be tightly attached to the material belt.

[0022] The full printing roller assembly 5 also includes an ink tank 57. The ink roller assembly 51 includes an immersion roller 511 immersed in the ink tank 57 and a coloring roller 512 that rotates with the immersion roller 511. The coloring roller 512 is in contact with the printing section 521 of the printing roller 52. Lifting components 54 are provided at both ends of the immersion roller 511. The lifting components 54 abut against both ends of the immersion roller 511 and are used to adjust the immersion depth of the immersion roller 511 in the ink tank 57. The lifting components 54 include abutment racks 541 located below and abutting against both ends of the immersion roller 511. A rotating gear shaft 542 is provided on the meshing side of the abutment rack 541 and is rotatable therewith. When the rotating gear shaft 542 rotates, it drives the abutment rack 541 to move up and down, thereby driving both ends of the immersion roller 511 to move up and down at the lifting groove 571 of the ink tank 57.

[0023] A pressing and adjusting mechanism 55 is provided at one end of the coloring roller 512 along its axial direction. The pressing and adjusting mechanism 55 includes an adjusting plate 551 with an arc-shaped adjusting groove 5511 and a driving member 552. One end of the coloring roller 512 extends out of the adjusting groove 5511 and forms a transmission engagement with the driving member 552. This allows the driving member 552 to drive the coloring roller 512 to move circumferentially along the adjusting groove 5511.

[0024] The usage process in this embodiment is as follows: The dyeing roller 511, immersed in the ink tank 57, rotates and simultaneously drives the coloring roller 512 to rotate. As the coloring roller 512 rotates, it squeezes out the ink particles from the ink tank 57. Simultaneously, the contact point between the coloring roller 512 and the dyeing roller 511 is located within the ink tank 57, allowing excess ink and ink particles to return to the ink tank 57. The other end of the coloring roller 512 contacts the printing section 521 to apply its own ink to the printing section 521, thereby pressing against the printing belt as the printing section 521 rotates to print on the belt.

[0025] In addition, the printing part 521 can be arranged in a ring on the printing roller 52 or distributed in a spiral on the printing roller 52. That is, the shape of the printing part 521 is not limited and can be designed according to the printing shape.

[0026] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A printing machine, comprising an unwinding device, a printing device, and a rewinding device with differential transmission function, wherein a tensioning device is provided between the unwinding device and the printing device, and the printing device comprises a plurality of printing rollers, each printing roller having printed part or all of the pattern required for the material strip, characterized in that: A fully rotating printing roller assembly is provided between the tensioning device and the unwinding device. The fully rotating printing roller assembly includes an ink roller assembly with ink printed on it and a printing roller driven by the ink roller assembly. The printing roller is provided with several printing sections, one end of which abuts against the ink roller and the other end of which abuts against the material strip.

2. The printing press according to claim 1, characterized in that: The full printing roller assembly also includes an ink tank, and the ink roller assembly includes an immersion roller immersed in the ink tank and a coloring roller that rotates with the immersion roller. The coloring roller is in contact with the printing section of the printing roller.

3. The printing press of claim 2, wherein: The dyeing roller is equipped with lifting components at both ends. The lifting components abut against both ends of the dyeing roller and are used to adjust the depth of the dyeing roller's immersion in the ink tank.

4. The printing press according to claim 2, characterized in that: The side of the coloring roller is provided with a pressing and adjusting mechanism. The pressing and adjusting mechanism includes an adjusting plate with an arc-shaped moving groove and a driving component. One end of the coloring roller extends out from the moving groove and forms a transmission engagement with the driving component.

5. The printing press according to claim 4, characterized in that: The radial extensions at both ends of the coloring roller are provided with clamping members that apply radial pressure to the coloring roller.

6. The printing press according to claim 1, characterized in that: The full printing roller assembly also includes a pressure roller. The printing roller and the pressure roller abut against both sides of the material belt, and the printing section and the pressure roller form an interference fit.

7. The printing press according to claim 1, characterized in that: A storage roller group is provided between the tensioning device and the printing device. The storage roller group includes several groups of driven rollers, and the driven rollers in the same group are vertically distributed to each other.

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