A constant pressure roller for a label printer with an anti-stick film
By precisely supplying air to the constant pressure roller through the air slip ring assembly to form an air film to prevent sticking, the problem of easy wear of traditional coatings is solved, achieving a highly efficient and energy-saving anti-sticking effect, and improving printing quality and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN PRINTING TECH CO LTD
- Filing Date
- 2025-09-23
- Publication Date
- 2026-07-21
AI Technical Summary
The coating of traditional constant pressure rollers is prone to wear and has a short lifespan, which causes the anti-stick effect to decrease over time, requiring frequent replacement or maintenance, thus affecting printing quality and efficiency.
The system employs an air slip ring assembly, which, through the cooperation of a moving slip ring and a fixed slip ring, precisely supplies air to the specific area where the roller and the film are about to separate, forming an air film to prevent sticking. Combined with a V-shaped air inlet groove and a sealing structure, it ensures stable gas delivery and uniform gas escape.
It significantly improves printing quality and production efficiency, reduces compressed gas consumption, extends equipment operating reliability and maintenance economy, and avoids defects caused by coating wear.
Smart Images
Figure CN224530234U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of constant pressure roller technology, specifically a constant pressure roller for an anti-sticking label printing machine. Background Technology
[0002] Label printing machines are core equipment in the modern packaging industry. With their high precision and efficiency, they achieve exquisite reproduction of images and text on various materials. A key to ensuring stable printing quality lies in their ink distribution and impression systems. In this system, the constant pressure roller plays a crucial role. As a core functional component, its fundamental mission is to provide continuous and uniform pressure. Whether in flexographic or letterpress printing, the constant pressure roller ensures a constant contact pressure between the printing plate roller and the substrate. This constant pressure effectively avoids defects such as uneven ink color, dot distortion, or blurry prints caused by pressure fluctuations, and is a vital foundation for ensuring consistent color and clear outlines in printed products.
[0003] Constant pressure rollers are widely used in various high-end printing scenarios, but they still have certain problems: traditional technologies usually use passive solutions such as Teflon coatings or silicone materials to reduce adhesion, but these coatings are easy to wear, have a short lifespan, and need to be replaced or maintained frequently, and the anti-sticking effect continues to decline over time; therefore, in view of the above situation, there is an urgent need to develop a constant pressure roller for label printing machines with anti-stick film to overcome the shortcomings in current practical applications and meet current needs. Utility Model Content
[0004] The purpose of this invention is to provide a constant pressure roller for a label printing machine with anti-stick film, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a constant pressure roller for an anti-sticking label printing machine, comprising: a suspension, an end seal, a pressure roller assembly, and an air slip ring assembly;
[0006] The pressure roller assembly has end seals at both ends, and a rotating shaft is provided on the end seal. The rotating shaft is rotatably connected to the suspension.
[0007] The pressure roller assembly includes an inner cylinder and a roller sleeved outside the inner cylinder. The inner wall of the inner cylinder is provided with multiple sets of annularly distributed air guide grooves, and the roller is provided with multiple sets of annularly distributed exhaust microholes.
[0008] The air slip ring assembly includes a moving slip ring and a fixed slip ring disposed inside the inner cylinder, with the moving slip ring and the fixed slip ring rotatably engaged;
[0009] The moving slip ring is provided with multiple independent air inlets that correspond one-to-one with the air guide grooves, and the fixed slip ring is provided with an air supply channel that connects to an external air source. The air supply channel is configured to connect only to the independent air inlets that are rotated to a specific position.
[0010] The fixed slip ring is connected to an extension bracket, which passes through the end seal and the pivot shaft and is connected to the suspension.
[0011] Specifically, the multiple independent air inlets on the moving slip ring of the air slip ring assembly are connected one-to-one with the air guide grooves on the inner cylinder. The air supply channel on the fixed slip ring selectively supplies air only to the independent air inlets at specific positions where the roller is about to separate from the film. This allows the gas to escape precisely from the exhaust micro-holes in that area, forming an effective air film between the label and the outer wall of the roller. This significantly prevents film adhesion, improves printing quality and production efficiency, and avoids the waste of compressed gas, achieving energy saving and consumption reduction.
[0012] Preferably, the inner wall of the inner cylinder is provided with an air inlet groove, and the air guide groove is connected to the exhaust micro-hole through the air inlet groove. The air inlet groove has a V-shaped structure.
[0013] Specifically, the inner wall of the inner cylinder has a V-shaped air inlet groove. This V-shaped structure effectively increases the cross-sectional area for gas flow, significantly reduces airflow resistance, and allows gas to pass through the air guide groove more smoothly and quickly and escape evenly from the exhaust micro-holes. At the same time, the V-shaped opening design is not easily blocked by tiny impurities, ensuring the smoothness and reliability of the exhaust channel during long-term operation of the constant pressure roller, thereby improving the stability and uniformity of the anti-sticking effect.
[0014] Preferably, the pore size of the exhaust micropores is in the range of 0.1mm-0.5mm.
[0015] Specifically, the pore size of the exhaust micropores is limited to 0.1mm-0.5mm. This fine pore size can form a dense, uniform and gentle air curtain on the roller surface, which can provide sufficient gas pressure to effectively separate the label and the film to prevent adhesion, and can also avoid interfering with printing accuracy or damaging the material due to excessive airflow. At the same time, the smaller pore size helps to reduce the consumption of compressed air, thus achieving a balance between high efficiency and energy saving and reliable anti-stick film.
[0016] Preferably, the end seal and the pressure roller assembly are connected by a snap-fit structure, which includes a snap-fit groove at the end of the inner cylinder and the roller, and a snap-fit block on the end seal.
[0017] Specifically, through the precise fit between the end-seal locking block and the locking groove at the end of the inner cylinder and roller, the inner cylinder and roller are constrained and positioned simultaneously in the axial and circumferential directions. This effectively prevents relative displacement or misalignment between the inner cylinder and roller during high-speed rotation or assembly, fundamentally ensuring that the air guide groove and air inlet groove on the inner cylinder and the exhaust micro-hole on the roller are always precisely aligned and the air path is unobstructed, thus ensuring the reliability and stability of the constant pressure roller anti-sticking film air path system.
[0018] Preferably, the contact surface between the moving slip ring and the fixed slip ring is provided with a sealing structure, which includes a sealing ring or a wear-resistant sealing ring.
[0019] Specifically, the contact surfaces of the moving and fixed slip rings are equipped with sealing structures such as sealing rings or wear-resistant sealing rings. This structure can effectively seal the gap between the relative rotating interfaces of the moving and fixed slip rings, preventing abnormal leakage of compressed gas from the high-pressure chamber to the low-pressure side. This ensures that the gas pressure in the gas supply channel is stable and concentratedly delivered to the target independent air inlet, thereby ensuring the stable formation of the anti-sticking film air curtain and the airtightness of the system. At the same time, the wear-resistant properties extend the service life of the slip ring assembly and reduce the maintenance needs caused by wear.
[0020] Preferably, the specific location corresponds to the area where the outer wall of the roller will detach from the film after contact.
[0021] Specifically, by precisely limiting the air supply range of the air supply channel to the specific area where the roller outer wall is about to detach from the film after contact, the compressed gas forms an air curtain only at this critical location. This method can most effectively utilize gas pressure to apply a lifting force at the moment the label separates from the film, achieving the most reliable separation effect with minimal air consumption. It completely avoids gas waste and energy loss caused by premature or delayed air supply, and ensures that the printed material is not pulled or shifted at the moment of separation. Thus, it ensures extremely high printing quality and production efficiency while significantly saving energy.
[0022] Preferably, the suspension is provided with a retainer for securing the extension frame.
[0023] Specifically, the suspension is equipped with a retainer for fixing the extension bracket. This retainer provides a stable and reliable mounting base for the core stationary component. By firmly locking the extension bracket, the absolute stationary position of the fixed slip ring in the entire air slip ring assembly is ensured, thereby forming a precise and reliable relative motion pair with the high-speed rotating moving slip ring. This ensures the accurate realization of the selective air supply function. At the same time, its rigid support structure effectively suppresses potential vibrations and improves the smoothness of equipment operation and service life.
[0024] Preferably, a bearing is fitted on the rotating shaft, and the rotating shaft is rotatably connected to the suspension through the bearing.
[0025] Preferably, the extension frame and the retainer are adjustablely connected.
[0026] Compared with the prior art, this utility model provides a constant pressure roller for an anti-sticking label printing machine, which has the following beneficial effects:
[0027] By precisely supplying airflow to the specific area where the roller and film are about to separate through the air slip ring assembly, non-contact anti-sticking is achieved by utilizing the formed air film. This completely solves the fundamental defects of traditional anti-sticking methods that rely on coatings, such as rapid wear, short lifespan, and high risk of contamination. At the same time, it greatly reduces compressed gas consumption while ensuring excellent anti-sticking effect, and significantly improves the reliability of equipment operation, maintenance economy, and stability of printing quality. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a schematic diagram of the front structure of this utility model;
[0030] Figure 2 This is an exploded view of the present invention;
[0031] Figure 3 This is a schematic diagram of the pressure roller assembly structure of this utility model;
[0032] Figure 4 This is a schematic diagram of the roller structure of this utility model;
[0033] Figure 5 This is a schematic diagram of the inner cylinder structure of this utility model;
[0034] Figure 6 This is a schematic diagram showing the positional relationship between the air guide groove and the moving slip ring of this utility model;
[0035] Figure 7 This is one of the schematic diagrams of the fixed slip ring structure of this utility model;
[0036] Figure 8 This is the second schematic diagram of the fixed slip ring structure of this utility model.
[0037] In the diagram: 10, suspension; 110, bearing; 120, cage; 20, end seal; 210, shaft; 220, locking block; 30, pressure roller assembly; 310, inner cylinder; 320, roller; 330, air guide groove; 340, air inlet groove; 350, exhaust micro-hole; 360, locking groove; 40, air slip ring assembly; 410, moving slip ring; 420, fixed slip ring; 430, extension frame; 440, independent air inlet; 450, air supply channel. Detailed Implementation
[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0039] 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.
[0040] Example:
[0041] Please see Figures 1-8 This utility model provides a technical solution: a constant pressure roller for an anti-stick label printing machine, comprising: a suspension 10, an end seal 20, a pressure roller assembly 30, and an air slip ring assembly 40;
[0042] The pressure roller assembly 30 has end seals 20 at both ends, and a rotating shaft 210 is provided on the end seals 20. The rotating shaft 210 is rotatably connected to the suspension 10.
[0043] The pressure roller assembly 30 includes an inner cylinder 310 and a roller 320 sleeved outside the inner cylinder 310. The inner wall of the inner cylinder 310 is provided with a plurality of annularly distributed air guide grooves 330, and the roller 320 is provided with a plurality of annularly distributed exhaust microholes 350.
[0044] The air slip ring assembly 40 includes a movable slip ring 410 and a fixed slip ring 420 disposed in the inner cylinder 310, with the movable slip ring 410 and the fixed slip ring 420 rotatably engaged;
[0045] The moving slip ring 410 is provided with multiple independent air inlets 440 that correspond one-to-one with the air guide groove 330, and the fixed slip ring 420 is provided with an air supply channel 450 that is connected to an external air source. The air supply channel 450 is configured to be connected only to the independent air inlets 440 that are rotated to a specific position.
[0046] The fixed slip ring 420 is connected to the extension frame 430, which passes through the end seal 20 and the rotating shaft 210 and is connected to the suspension 10.
[0047] Specifically, the multiple independent air inlets 440 on the moving slip ring 410 of the air slip ring assembly 40 are connected one-to-one with the air guide grooves 330 on the inner cylinder 310. The air supply channel 450 on the fixed slip ring 420 selectively supplies air only to the independent air inlets 440 at a specific position where the roller 320 is about to separate from the film. This allows the gas to escape precisely from the exhaust micro-holes 350 in that area, forming an effective air film between the label and the outer wall of the roller 320. This significantly prevents film adhesion, improves printing quality and production efficiency, and avoids the waste of compressed gas, achieving energy saving and consumption reduction.
[0048] Preferably, the inner wall of the inner cylinder 310 is provided with an air inlet groove 340, and the air guide groove 330 is connected to the exhaust micro-hole 350 through the air inlet groove 340. The air inlet groove 340 has a V-shaped structure.
[0049] Specifically, the inner wall of the inner cylinder 310 is provided with a V-shaped air inlet groove 340. This V-shaped structure effectively increases the cross-sectional area for gas flow and significantly reduces airflow resistance, allowing gas to pass more smoothly and quickly through the air guide groove 330 and escape evenly from the exhaust micro-hole 350. At the same time, the V-shaped opening design is not easily blocked by tiny impurities, ensuring the smoothness and reliability of the exhaust channel during long-term operation of the constant pressure roller, thereby improving the stability and uniformity of the anti-sticking effect.
[0050] Preferably, the pore size of the exhaust micropores 350 is in the range of 0.1mm-0.5mm.
[0051] Specifically, the pore size of the exhaust micropores 350 is limited to 0.1mm-0.5mm. This fine pore size can form a dense, uniform and gentle air curtain on the surface of the roller 320. It can provide sufficient gas pressure to effectively separate the label and the film to prevent adhesion, and can also avoid interfering with printing accuracy or damaging the material due to excessive airflow. At the same time, the smaller pore size helps to reduce the consumption of compressed air, achieving a balance between high efficiency and energy saving and reliable anti-stick film.
[0052] Preferably, the end seal 20 and the pressure roller assembly 30 are connected by a snap-fit structure, which includes a snap-fit groove 360 at the ends of the inner cylinder 310 and the roller 320, and a snap-fit block 220 on the end seal 20.
[0053] Specifically, through the precise engagement of the locking block 220 on the end seal 20 with the locking groove 360 at the ends of the inner cylinder 310 and the roller 320, the inner cylinder 310 and the roller 320 are constrained and positioned simultaneously in the axial and circumferential directions. This effectively prevents relative displacement or misalignment between the inner cylinder 310 and the roller 320 during high-speed rotation or assembly. It fundamentally ensures that the air guide groove 330 and air inlet groove 340 on the inner cylinder 310 and the exhaust micro-hole 350 on the roller 320 are always precisely aligned and the air passage is unobstructed, thus ensuring the reliability and stability of the constant pressure roller anti-sticking film air passage system.
[0054] Preferably, the contact surface between the moving slip ring 410 and the fixed slip ring 420 is provided with a sealing structure, which includes a sealing ring or a wear-resistant sealing ring.
[0055] Specifically, the contact surfaces of the moving slip ring 410 and the fixed slip ring 420 are equipped with sealing structures such as sealing rings or wear-resistant sealing rings. This structure can effectively seal the gap between the relative rotating interfaces of the moving and fixed slip rings, preventing abnormal leakage of compressed gas from the high-pressure chamber to the low-pressure side. This ensures that the gas pressure in the air supply channel 450 is stable and concentratedly delivered to the target independent air inlet 440, thereby ensuring the stable formation of the anti-sticking film air curtain and the airtightness of the system. At the same time, the wear-resistant properties extend the service life of the slip ring assembly and reduce the maintenance needs caused by wear.
[0056] Preferably, the specific position corresponds to the area where the outer wall of the roller 320 is about to detach from the film after contact.
[0057] Specifically, by precisely limiting the air supply range of the air supply channel 450 to the specific area where the outer wall of the roller 320 is about to detach from the film after contact, the compressed gas forms an air curtain only at this critical location. This method can most effectively utilize the gas pressure to apply a lifting force at the moment of separation between the label and the film, achieving the most reliable separation effect with minimal air consumption. This completely avoids gas waste and energy loss caused by premature or delayed air supply, and ensures that the printed matter is not pulled or shifted at the moment of separation. Thus, it ensures extremely high printing quality and production efficiency while significantly saving energy.
[0058] Preferably, the suspension 10 is provided with a retainer 120 for fixing the extension frame 430.
[0059] Specifically, the suspension 10 is equipped with a retainer 120 for fixing the extension frame 430. The retainer 120 provides a stable and reliable mounting base for the core stationary component. By firmly locking the extension frame 430, the absolute stationary position of the fixed slip ring 420 in the entire air slip ring assembly 40 is ensured, thereby forming a precise and reliable relative kinematic pair with the high-speed rotating moving slip ring 410. This ensures the accurate realization of the selective air supply function. At the same time, its rigid support structure effectively suppresses potential vibrations and improves the stability and service life of the equipment.
[0060] Preferably, a bearing 110 is fitted on the rotating shaft 210, and the rotating shaft 210 is rotatably connected to the suspension 10 through the bearing 110.
[0061] Preferably, the extension frame 430 and the retainer 120 are adjustablely connected.
[0062] Working principle: When the constant pressure roller is working, its roller 320 presses the film label while rotating. At the same time, an external air source supplies air to the system through the air supply channel 450 on the completely stationary fixed slip ring 420. Since the fixed slip ring 420 is fixed by the suspension 10 through the extension frame 430 and the retainer 120, and the moving slip ring 410 with multiple independent air inlets 440 rotates with the inner cylinder 310, the air supply channel 450 can only be aligned with and connected to the independent air inlets 440 at the specific position where the roller 320 is about to separate from the film. The compressed gas then passes through the independent air inlet 440, the corresponding air guide groove 330 and the V-shaped air inlet groove 340 in sequence, and finally escapes evenly from the exhaust micropores 350 in a specific area on the surface of the roller 320, forming a precise, stable and soft air film in this area, which smoothly lifts and separates the label, thereby achieving the anti-sticking function efficiently and energy-savingly, and ensuring printing quality.
[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
Claims
1. A constant pressure roller for an anti-sticking label printing machine, characterized in that, include: Suspension (10), end seal (20), pressure roller assembly (30) and air slip ring assembly (40); The pressure roller assembly (30) is provided with end seals (20) at both ends, and a rotating shaft (210) is provided on the end seal (20). The rotating shaft (210) is rotatably connected to the suspension (10). The pressure roller assembly (30) includes an inner cylinder (310) and a roller (320) sleeved outside the inner cylinder (310). The inner wall of the inner cylinder (310) is provided with multiple sets of annularly distributed air guide grooves (330), and the roller (320) is provided with multiple sets of annularly distributed exhaust microholes (350). The air slip ring assembly (40) includes a movable slip ring (410) and a fixed slip ring (420) disposed in the inner cylinder (310), wherein the movable slip ring (410) and the fixed slip ring (420) are rotatably engaged; The moving slip ring (410) is provided with a plurality of independent air inlets (440) that correspond one-to-one with the air guide groove (330), and the fixed slip ring (420) is provided with an air supply channel (450) that is connected to an external air source. The air supply channel (450) is configured to be connected only to the independent air inlets (440) that are rotated to a specific position. The fixed slip ring (420) is connected to an extension frame (430), which passes through the end seal (20) and the pivot (210) and is connected to the suspension (10).
2. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The inner wall of the inner cylinder (310) is provided with an air inlet groove (340), and the air guide groove (330) is connected to the exhaust micro-hole (350) through the air inlet groove (340). The air inlet groove (340) has a V-shaped structure.
3. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The pore size of the exhaust micropore (350) ranges from 0.1 mm to 0.5 mm.
4. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The end seal (20) is connected to the pressure roller assembly (30) by a snap-fit structure, which includes a snap-fit groove (360) at the end of the inner cylinder (310) and the roller (320) and a snap-fit block (220) on the end seal (20).
5. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The contact surface between the moving slip ring (410) and the fixed slip ring (420) is provided with a sealing structure, which includes a sealing ring or a wear-resistant sealing ring.
6. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The specific location corresponds to the area where the outer wall of the roller (320) is about to detach from the film after contact.
7. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The suspension (10) is provided with a retainer (120) for fixing the extension frame (430).
8. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: A bearing (110) is fitted on the rotating shaft (210), and the rotating shaft (210) is rotatably connected to the suspension (10) through the bearing (110).
9. The constant pressure roller for an anti-sticking label printing machine according to claim 1, characterized in that: The extension frame (430) and the retainer (120) are adjustablely connected.