A rotary knife machine for label processing

Abstract

The utility model belongs to the technical field of round knife machine, especially for a kind of round knife machine for label processing, including the material feeding roller for supporting original label material roll and keeping material flat conveying by tension control, the die-cutting device for the label material conveyed from material feeding roller is die-cut, and the material collecting roller for collecting waste material or finished product after die-cutting, the die-cutting device includes pressing roller and the round knife installed on pressing roller, and the round knife is detachably connected with pressing roller. The utility model is detachably designed, and the same round knife machine can be adapted to round knives of multiple diameters, meet the die-cutting needs of different label sizes, reduce the repeated purchase cost of equipment, and also can quickly replace round knife, shorten the change time, improve the processing efficiency of small batch, multi-variety label;In addition, when round knife wears, only need to disassemble and replace blade instead of disassembling entire pressing roller assembly.

Description

Technical Field

[0001] This utility model belongs to the technical field of circular knife machine, specifically relating to a circular knife machine used for label processing. Background Technology

[0002] In the label processing industry, rotary die-cutting machines are a key piece of equipment widely used in the die-cutting production of various labels. Existing rotary die-cutting machines for label processing primarily consist of a feed roller, a take-up roller, and a die-cutting device located between them. The feed roller plays a crucial role in supporting the roll of original label material, ensuring the material remains flat during transport through precise tension control, providing a stable foundation for subsequent die-cutting processes. The take-up roller collects waste or finished products after die-cutting.

[0003] The die-cutting device is the core component of a rotary die-cutting machine, consisting of a pressure roller and a rotary die mounted on the pressure roller. However, in existing technology, the rotary die and the pressure roller are designed as a single piece. This design has revealed many shortcomings in practical use, causing numerous inconveniences in label processing and production.

[0004] On the one hand, when installing and replacing circular cutters of different diameters, since the circular cutter and the pressing roller are integrally formed, operators usually need to disassemble the entire pressing roller assembly from the cutter holder for overall replacement. This process is not only cumbersome, time-consuming, and labor-intensive, but frequent disassembly and installation can also easily damage other parts of the equipment, increasing maintenance costs and downtime.

[0005] On the other hand, because the rotary cutter and the pressing roller are integrally formed, the diameter of the rotary cutter on the same pressing roller is generally the same. However, in actual label processing and production, different customers have diverse needs for label sizes, such as narrow strip labels and large-format labels. The existing integral molding design cannot meet the diverse label size die-cutting requirements, limiting the applicability and production flexibility of the rotary cutter machine. When different sizes of labels need to be produced, the entire pressing roller assembly must be replaced, which not only increases production costs but also reduces production efficiency. Utility Model Content

[0006] To address the above problems, the purpose of this utility model is to provide a circular knife machine for label processing, thereby solving the problems mentioned in the background art.

[0007] This utility model provides a circular die-cutting machine for label processing, including a feeding roller for supporting the original label material roll and keeping the material flat during conveying by tension control, a die-cutting device for die-cutting the label material conveyed from the feeding roller, and a receiving roller for collecting waste or finished products after die-cutting. The die-cutting device includes a pressing roller and a circular die mounted on the pressing roller. The circular die is detachably connected to the pressing roller to allow for the replacement of circular dies of different diameters.

[0008] Preferably, the pressing roller has a mating hole, the circular cutter has a through hole, and the pressing roller and the circular cutter are connected by a threaded connection between a screw and the mating hole.

[0009] Preferably, the pressing roller has a plurality of mating holes evenly distributed on it to facilitate adjustment of the distance between two adjacent circular blades.

[0010] Preferably, the circular cutter and the circular ring are integrally formed, and the circular ring and the pressing roller are detachably connected.

[0011] Preferably, the screw comprises, from top to bottom, a head, a rod-shaped portion, and a threaded portion, and the mating hole comprises, from the outside to the inside, a smooth section and a threaded section.

[0012] Preferably, a buffer pad is provided between the circular cutter and the pressing roller, and the buffer pad has a circular hole that mates with the screw.

[0013] Preferably, the outer end of the perforation has a flared groove, and the head of the screw is located in the flared groove.

[0014] The beneficial effects of this utility model are: through the detachable design, the same rotary die-cutting machine can be adapted to rotary dies of various diameters to meet the die-cutting requirements of different label sizes, reduce the cost of repeated equipment purchases, and can also quickly replace rotary dies, significantly shortening changeover time and improving the processing efficiency of small batches and multiple varieties of labels; in addition, when the rotary dies are worn, only the blades need to be disassembled and replaced instead of the entire pressing roller assembly. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the prior art of this utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the first embodiment of the present utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of the first embodiment of the present invention;

[0018] Figure 4 This is an enlarged structural diagram of point A in this utility model;

[0019] Figure 5This is a three-dimensional structural diagram of the improved first embodiment of the present invention;

[0020] Figure 6 This is a schematic cross-sectional view of the improved first embodiment of the present invention;

[0021] Figure 7 This is a three-dimensional structural diagram of the second embodiment of the present invention;

[0022] Figure 8 This is a cross-sectional structural diagram of the second embodiment of the present invention.

[0023] In the diagram: 1. Feeding roller; 2. Die-cutting device; 3. Receiving roller; 4. Pressing roller; 5. Circular knife; 6. Mating hole; 7. Through hole; 8. Screw; 9. Ring; 10. Head; 11. Rod-shaped part; 12. Threaded part; 13. Smooth section; 14. Threaded section; 15. Buffer pad; 16. Circular hole; 17. Flared groove; 18. Support roller. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0025] like Figure 1As shown, this utility model describes a conventional circular die-cutting machine for label processing. It mainly includes a feeding roller 1, a receiving roller 3, and a die-cutting device 2 located between the feeding roller 1 and the receiving roller 3. The feeding roller 1 supports the original label material roll and maintains the material's flatness through tension control. The receiving roller 3 collects waste or finished products after die-cutting, including a first receiving roller 3 for collecting finished die-cut labels and a second receiving roller 3 located above the first receiving roller 3 for collecting waste. The first and second receiving rollers 3 are rotated by motors to facilitate material collection. The die-cutting device 2 includes a pressing roller 4 and a circular die 5 mounted on the pressing roller 4. In use, the original label material roll is mounted on the feeding roller 1 of the circular die-cutting machine to ensure the material roll is securely mounted and can rotate smoothly for feeding. Simultaneously, based on the material's characteristics and thickness, the tension control system of the feeding roller 1 is adjusted to maintain appropriate tension during material conveying, preventing material slack or excessive stretching and ensuring die-cutting accuracy. According to the label's design requirements, a circular blade 5 with a suitable diameter and blade shape is selected. Then, the pressure between the pressing roller 4 and the support roller 18 (or other matching rollers) is adjusted to ensure the circular blade 5 accurately cuts into the label material, while simultaneously ensuring the die-cut label separates smoothly from the waste material. The circular blade 5 machine is started, and the feeding roller 1 begins to rotate, smoothly conveying the original label material to the die-cutting area. During conveying, the material is guided and tensioned by multiple guide rollers, maintaining a flat and stable operating state. When the label material reaches the die-cutting area, the pressing roller 4 drives the circular blade 5 to rotate, and the circular blade 5 cuts into the label material with a certain pressure. The blade shape of the circular blade 5 determines the final shape of the label. By precisely controlling the blade shape and pressure of the circular blade 5, various complex shapes of labels can be die-cut, such as circles and squares. After die-cutting, the label separates from the waste material. By designing a reasonable waste removal device, such as a waste removal needle or a waste removal roller, the waste material is peeled off from the label material and guided to a waste collection device (such as the second receiving roller 3). The die-cut labels then continue to move forward with the material conveyor belt. The above is an introduction to existing rotary die-cutting machines used for label processing.

[0026] As can be seen from the above, the existing rotary die-cutting machine for label processing has the following defects: the rotary die 5 and the pressing roller 4 are integrally formed. When installing and replacing rotary dies 5 of different diameters, it is usually necessary to disassemble the entire pressing roller 4 assembly from the die holder and replace it as a whole. At the same time, since the rotary die 5 and the pressing roller 4 are integrally formed, the diameter of the rotary dies 5 on the same pressing roller 4 is generally the same, which cannot meet the die-cutting requirements of different label sizes (such as narrow strip labels and large-format labels). Based on the above problems, the present invention adopts the following improvement method to solve them.

[0027] like Figure 2-8As shown, a circular die-cutting machine for label processing improves the die-cutting device 2 based on the existing technology by making the circular die 5 and the pressing roller 4 detachably connected, thereby enabling convenient replacement of the circular die 5. When the circular die 5 is worn, only the blade needs to be replaced instead of the entire pressing roller 4 assembly, reducing the cost of a single maintenance by 40%-60%.

[0028] Furthermore, such as Figure 2-4 As shown in the first embodiment of this utility model, a mating hole 6 is provided on the pressing roller 4, and a through hole 7 is provided on the circular blade 5. To increase the stability of the circular blade 5, the through hole 7 is located at the center of the circular blade 5. The pressing roller 4 and the circular blade 5 are connected by a screw 8 threadedly engaging with the mating hole 6, thereby allowing the circular blade 5 to be disassembled and replaced without disassembling the pressing roller 4 assembly. To facilitate adjustment of the distance between two adjacent circular blades 5 to adjust the label size, multiple mating holes 6 are provided on the pressing roller 4, and the mating holes 6 are evenly distributed on the pressing roller 4. During use, by adjusting the position of the mating holes 6, 2-6 circular blades 5 can be installed in parallel, and multiple labels (such as medicine bottle label combinations) can be produced in a single die-cutting, increasing production capacity. The evenly distributed mating holes 6 (such as a spacing error of ≤0.1mm) ensure the consistency of label spacing when die-cutting with multiple circular blades 5, meeting the strict specifications of the pharmaceutical, food and other industries. The preset positions of the mating holes 6 correspond to common label specifications (such as 30mm and 50mm spacing), eliminating the need for measurement when changing labels and shortening operation time.

[0029] In the first embodiment, the screw 8 includes, from top to bottom, a head 10, a rod-shaped portion 11, and a threaded portion 12. The mating hole 6 includes, from the outside to the inside, a smooth section 13 and a threaded section 14. The threaded portion 12 and the threaded section 14 mate with each other and are both located on the side away from the circular cutter 5, positioned at the inner end of the mating hole 6. To reduce the wear of the circular cutter 5 during the die-cutting process, such as... Figure 5-6 As shown, in an improvement to the first embodiment, a buffer pad 15 is provided between the circular blade 5 and the pressing roller 4. The buffer pad 15 has a circular hole 16 that mates with the screw 8. When the circular blade 5 contacts the label material, it is subjected to pressure and moves along the rod-shaped portion 11 of the screw 8 towards the threaded portion 12. At this time, the buffer pad 15 (e.g., made of silicone, with a hardness of 30-50 Shore A) is deformed by compression, which not only reduces wear on the circular blade 5 but also prevents hard contact between the circular blade 5 and the pressing roller 4, thus preventing scratches on the roller surface. Furthermore, the outer end of the perforation 7 has a flared groove 17, and the head 10 of the screw 8 is located within the flared groove 17. The head 10 of the screw 8 is hidden within the flared groove 17, preventing the protruding part from scratching the label material (e.g., PET film with a thickness of only 12μm), thus improving the yield rate to over 99.5%.

[0030] Furthermore, such as Figure 7-8As shown, in the second embodiment of this utility model, a circular blade 5 (which can be of the same diameter or different diameters) is fixedly mounted on a circular ring 9. The inner diameter of the circular ring 9 is adapted to the diameter of the pressing roller 4. The circular ring 9 is fitted onto the pressing roller 4, and multiple circular holes 16 are made on the circular ring 9. Multiple mating holes 6 that are adapted to the circular holes 16 are made on the pressing roller 4. A screw 8 is passed through the circular holes 16 and screwed into the mating holes 6 to form a threaded connection with the mating holes 6. Of course, the circular ring 9 can also be fixed to the pressing roller 4 in other ways, such as threaded connection, magnetic adsorption connection, etc. Figure 6 As shown, the circular blade 5 protrudes from the ring 9. When the ring 9 is fixed with the screw 8, the screw 8 will not scratch the label material. In this embodiment, circular blades 5 of different diameters are fixedly installed on the ring 9 according to specific distance requirements, and then the ring 9 is installed on the pressing roller 4. Compared with the first embodiment, it is not necessary to fix the circular blades 5 on the pressing roller 4 one by one, which saves installation time.

[0031] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0032] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the protection scope of this utility model.

Claims

1. A circular die cutter for label processing, comprising a feeding roller (1) for supporting a roll of original label material and maintaining the material flat during conveying by tension control, a die-cutting device (2) for die-cutting the label material conveyed from the feeding roller (1), and a receiving roller (3) for collecting waste or finished products after die-cutting, wherein the die-cutting device (2) comprises a pressing roller (4) and a circular die (5) mounted on the pressing roller (4), characterized in that: The circular cutter (5) is detachably connected to the pressing roller (4) to enable the replacement of circular cutters (5) with different diameters.

2. A circular knife machine for label processing according to claim 1, characterized in that: The pressing roller (4) has a mating hole (6), and the circular cutter (5) has a through hole (7). The pressing roller (4) and the circular cutter (5) are connected by a screw (8) and the mating hole (6).

3. A circular knife machine for label processing according to claim 2, characterized in that: The pressing roller (4) is provided with a plurality of mating holes (6) evenly distributed to facilitate adjustment of the distance between two adjacent circular knives (5).

4. A circular knife machine for label processing according to claim 1, characterized in that: The circular knife (5) and the circular ring (9) are integrally formed, and the circular ring (9) and the pressing roller (4) are detachably connected.

5. A circular knife machine for label processing according to claim 2, characterized in that: The screw (8) includes, from top to bottom, a head (10), a rod-shaped part (11) and a threaded part (12), and the mating hole (6) includes, from the outside to the inside, a smooth section (13) and a threaded section (14).

6. A circular knife machine for label processing according to claim 5, characterized in that: A buffer pad (15) is provided between the circular cutter (5) and the pressing roller (4), and the buffer pad (15) has a circular hole (16) that cooperates with the screw (8).

7. A circular knife machine for label processing according to claim 2, characterized in that: The outer end of the perforation (7) has a flared groove (17), and the head (10) of the screw (8) is located in the flared groove (17).

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