A film feeding anti-reverse winding safety device for a carton packaging machine

Abstract

The utility model relates to the field of carton cigarette packaging, and specifically provides a film feeding anti-reverse winding safety device for carton cigarette packaging machine, which comprises a non-woven fabric roll, a swing rod unit and a pressing plate unit all arranged on a rack, the non-woven fabric roll passively outputs non-woven fabric for wrapping carton cigarettes, the non-woven fabric roll rotates by pulling the non-woven fabric, the non-woven fabric adjusts tension through the swing rod unit, and the pressing plate unit is used to increase the tension of the non-woven fabric. In the utility model, because the pushing distance of the carton cigarette for pulling the non-woven fabric is certain and the stroke of the pressing plate unit is also certain, the output of the non-woven fabric roll is consistent, and the non-woven fabric roll will rotate out as much as the amount of non-woven fabric used, so the problem of mismatch between the output of the non-woven fabric roll and the amount of non-woven fabric used by the carton cigarette does not occur, the safety of the carton cigarette is improved, the reverse winding condition is prevented, and the wrapping quality of the carton cigarette is better.

Description

Technical Field

[0001] This utility model relates to the field of cigarette packaging, specifically providing a safety device for preventing rollback of the film during cigarette packaging. Background Technology

[0002] In tobacco logistics, due to the different needs of each retailer, cigarette cartons need to be sorted before distribution. To facilitate distribution, the sorted cigarette cartons need to be packaged into cigarette packs. Existing patent CN113859613A provides a non-woven fabric cigarette pack packaging machine for this purpose, including a frame, control box, packaging and sealing platform, side-pushing cigarette device, cigarette pressing device, moving multi-blade sealing and cutting device, tension detection roller group, fabric pulling roller group, and unwinding roller. This cigarette pack packaging machine uses the active rotation of the unwinding roller equipped with a non-woven fabric roll to continuously rotate and transport the non-woven fabric. The non-woven fabric is then tensioned and wrapped around the cigarette cartons under the action of the film pulling roller group.

[0003] However, as the unwinding roller of this equipment continuously rotates and feeds the film, the diameter of the nonwoven fabric roll on it decreases. A smaller roll diameter means that the length of nonwoven film fed per revolution of the unwinding roller decreases. Later, high-speed rotation of the unwinding roller may even be necessary to feed the appropriate length of film. High-speed roller rotation easily causes motor malfunctions and safety issues. Furthermore, it is difficult to precisely control the film feeding amount due to variations in the speed of the drive roller, which can easily lead to backwinding and affect the overall quality of the cigarette packaging. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a device that differs from existing technologies in that it actively feeds nonwoven fabric via an unwinding roller. The specific technical solution is as follows:

[0005] A safety device for preventing rollback of film in a cigarette packing machine includes a nonwoven fabric roll, a swing arm unit, and a pressure plate unit, all mounted on the machine frame. The nonwoven fabric roll passively outputs nonwoven fabric for wrapping cigarette packs. The nonwoven fabric roll rotates by pulling the nonwoven fabric. The tension of the nonwoven fabric is adjusted by the swing arm unit. The pressure plate unit is used to increase the tension of the nonwoven fabric.

[0006] Unlike existing nonwoven fabric rolls that rely on the active rotation of the unwinding roller for conveying, this solution requires pulling the nonwoven fabric roll to rotate and output it. When applied to a nonwoven cigarette packing machine, this means the nonwoven fabric roll only rotates and outputs during the process of the cigarette pack being pushed and continuously contacting the nonwoven fabric, and finally, during the pressure plate unit pressing down on the nonwoven fabric to adhere it to the back of the cigarette pack. Because the pushing distance of the cigarette pack and the stroke of the pressure plate unit are constant, the output of the nonwoven fabric roll is consistent; the amount of nonwoven fabric used will be pulled out equal to the amount of nonwoven fabric used, preventing a mismatch between the output of the nonwoven fabric roll and the amount of nonwoven fabric used in the cigarette pack. This improves the safety of the cigarette pack, prevents backwinding, and enhances the packaging quality.

[0007] Preferably, the nonwoven fabric roll has two sets, upper and lower, which are connected at the packaging and sealing platform in the cigarette packaging machine.

[0008] Preferably, the swing arm unit includes an elastic member and a swing roller that is always in contact with the nonwoven fabric. The swing roller is rotatably connected to the frame via a connecting rod. When the tension of the nonwoven fabric changes, the swing roller is subjected to force and rotates through the connecting rod. The elastic member connects the swing roller and the frame and provides a force that restricts the rotation of the connecting rod.

[0009] Unlike existing technologies that require tensile testing to determine whether the tension of the nonwoven fabric is appropriate, and then actively adjust the output speed of the nonwoven fabric roll, this application uses a swing arm unit to convert the tension of the nonwoven fabric into a pulling force that rotates the swing roller. By automatically adjusting the tension of the nonwoven fabric, the pushing force transmitted to the nonwoven fabric when the cigarette pack is pushed is balanced with the elastic force provided by the elastic component, so that the tension of the nonwoven fabric when packaging the cigarette pack is automatically within the required range.

[0010] Of course, since the nonwoven fabric needs to be kept taut at all times, to prevent accidental rotation of the nonwoven fabric roll and output of nonwoven fabric, which could loosen the tension of the nonwoven fabric in the entire device, the swing arm unit should include a swing arm and a swing roller that is always in contact with the nonwoven fabric. The swing arm is rotatably connected to the frame, and the swing roller is rotatably connected to the swing shaft of the swing arm via a connecting rod. The connecting rod can rotate α° relative to the swing arm. The end of the swing arm is connected to the frame via an elastic member, which provides a force to limit the rotation of the swing arm.

[0011] In this scheme, when the tension of the nonwoven fabric is allowed to vary within a certain range, the tension of the nonwoven fabric on the oscillating roller allows the oscillating roller to rotate only by overcoming its own weight, without transmitting the tension to the nonwoven fabric roll. Only when the tension of the nonwoven fabric is too large, and the moving angle of the connecting rod of the oscillating roller is equal to α° relative to the oscillating rod, will the oscillating rod also oscillate, thereby subjecting the elastic component to force, and thus causing the oscillating roller to oscillate, dynamically balancing the tension of the entire nonwoven fabric.

[0012] Preferably, at least one swing arm unit is provided to control the tension when the nonwoven fabric wraps the cigarette pack.

[0013] Preferably, the nonwoven fabric roll is connected to a brake via a clutch switch to ensure that the nonwoven fabric roll will not be passively rotated and output nonwoven fabric due to tension or strain during cigarette packaging, thus ensuring the safety of the device.

[0014] Preferably, in order to further ensure the safety and automation of the equipment, a tension sensor is provided at the elastic member. The tension sensor is electrically connected to the clutch switch. After the elastic member outputs elastic force, the tension sensor detects the signal and transmits it to the clutch switch, causing the nonwoven fabric roll to disconnect from the brake.

[0015] In this scheme, the brake on the nonwoven roll is released only when the cigarette pack is pushed forward and the tension of the nonwoven fabric increases to balance the tension of the swing arm unit, allowing the nonwoven roll to be pulled by the nonwoven fabric to rotate and output the nonwoven fabric.

[0016] Of course, in current cigarette packaging equipment, when the packaging is unlocked or an emergency stop is required, the nonwoven fabric roll will not immediately stop conveying the nonwoven fabric due to inertia or signal delays. Consequently, when the equipment starts up again, the nonwoven fabric may not be taut or the tension may be unsuitable, and the swing arm unit cannot immediately adjust the tension. This will seriously affect the quality assurance of the cigarette pack. To avoid this situation, a tension compensation roller group is also included. The tension compensation roller group includes a gravity roller and a slide bar mounted on the frame. The two ends of the gravity roller are slidably mounted on the slide bar, and the gravity roller is always in contact with the nonwoven fabric.

[0017] In this scheme, during the entire operation of the equipment, the tension of the nonwoven fabric is dynamically balanced, and the position of the gravity roller remains unchanged. When the equipment stops, the dynamic balance of the tension of the nonwoven fabric stops, and if the nonwoven fabric roll stops in time and an extra section of nonwoven fabric is conveyed, the gravity roller will slide down along the slide bar due to its own weight until it receives the support force of the nonwoven fabric and balances its own weight, thus effectively tightening the nonwoven fabric.

[0018] Preferably, since there are two nonwoven fabric rolls, each nonwoven fabric roll is provided with a set of tension compensation rollers.

[0019] Preferably, the pressure plate unit includes a pressure strip driven by a telescopic cylinder. The telescopic cylinder extends, causing the pressure strip to extend and continuously abut against the nonwoven fabric, thereby increasing the tension of the nonwoven fabric and ensuring that all four sides of the cigarette pack are tightly wrapped by the nonwoven fabric.

[0020] The beneficial effects of this utility model are:

[0021] This invention differs from existing nonwoven fabric rolls that use the active rotation of the unwinding roller to transport the nonwoven fabric. Instead, it uses a passive output method to transport the nonwoven fabric. The nonwoven fabric roll can only be rotated and output by pulling the nonwoven fabric. Since the pushing distance of the cigarette pack that can pull the nonwoven fabric is constant and the stroke of the pressure plate unit is also constant, the output of the nonwoven fabric roll is consistent. The amount of nonwoven fabric used will be pulled out by the nonwoven fabric roll, and there will be no problem of mismatch between the output of the nonwoven fabric roll and the amount of nonwoven fabric used in the cigarette pack. This improves the safety of the cigarette pack, prevents backwinding, and also makes the cigarette pack packaging quality better. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this utility model, the accompanying 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.

[0023] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0024] Figure 2 This is a cross-sectional view of the present invention;

[0025] Figure 3 This is a three-dimensional schematic diagram of the swing arm unit of this utility model;

[0026] Figure 4 This is a three-dimensional schematic diagram of the tension compensation roller assembly of this utility model.

[0027] In the above figures, the corresponding reference numerals are as follows:

[0028] 1-Frame, 2-Non-woven fabric roll, 3-Non-woven fabric, 4-Swing rod unit, 41-Elastic component, 42-Swing roller, 43-Connecting rod, 44-Swing rod, 5-Pressure plate unit, 51-Telescopic cylinder, 52-Pressure strip, 6-Packaging and sealing platform, 7-Tension compensation roller group, 71-Slide rod, 72-Gravity roller, 8-Guide roller. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described in conjunction with the accompanying drawings and through specific implementation methods of the embodiments of this utility model.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] Example 1:

[0034] A safety device for preventing film rollback in cigarette packaging machines, such as Figure 1 and Figure 2 As shown, the machine includes a nonwoven fabric roll 2, a swing arm unit 4, and a pressure plate unit 5, all mounted on the frame 1. The nonwoven fabric roll 2 passively outputs nonwoven fabric 3 for wrapping cigarette packs. The nonwoven fabric roll 2 rotates by pulling the nonwoven fabric 3. The tension of the nonwoven fabric 3 is adjusted by the swing arm unit 4. The pressure plate unit 5 is used to increase the tension of the nonwoven fabric 3.

[0035] In this embodiment, unlike existing nonwoven fabric rolls 2 which use the active rotation of the unwinding roller to transport the nonwoven fabric 3, in this solution, the nonwoven fabric roll 2 can only rotate and output the nonwoven fabric 3 by pulling it. When applied to a cigarette packing machine, this means that the nonwoven fabric roll 2 can only rotate and output during the process of the cigarette pack being pushed and continuously contacting the nonwoven fabric 3, and finally, during the process of the pressure plate unit 5 pressing down on the nonwoven fabric 3 to adhere it to the back of the cigarette pack. Since the pushing distance of the cigarette pack and the stroke of the pressure plate unit 5 are constant, the output of the nonwoven fabric roll 2 is consistent; the amount used will be the same as the amount of nonwoven fabric roll 2 that is pulled out, preventing a mismatch between the output of the nonwoven fabric roll 2 and the amount of nonwoven fabric 3 used in the cigarette pack. This improves the safety of the cigarette pack, prevents backwinding, and also improves the quality of the cigarette pack packaging.

[0036] Specifically, the entire device is equipped with multiple guide rollers 8 (rollers not specifically marked in the attached diagram all belong to guide rollers 8), allowing the nonwoven fabric 3 to be pulled and released around a specific channel, preventing the nonwoven fabric 3 from obstructing the normal operation of other components of the packaging machine. Furthermore, the pressure plate unit 5 includes a pressure strip 52 driven by a telescopic cylinder 51. The telescopic cylinder 51 extends, causing the pressure strip 52 to extend and continuously press against the nonwoven fabric 3, increasing the tension of the nonwoven fabric 3 and ensuring that all four sides of the cigarette pack are tightly wrapped by the nonwoven fabric 3. The nonwoven fabric roll 2 has upper and lower sets, connected at the packaging sealing and cutting platform 6 in the cigarette pack packaging machine. When the cigarette pack is pushed, it does not need to be flipped over; it only relies on the front side to press against the nonwoven fabric 3 and move, ensuring that the front, top, and bottom surfaces of the cigarette pack are all in contact with the nonwoven fabric 3. The upper nonwoven fabric 3 wraps around the back of the cigarette pack under the pressure of the pressure strip 52.

[0037] Example 2:

[0038] This embodiment provides a specific swing arm unit 4 structure based on embodiment 1. The swing arm unit 4 includes an elastic member 41 and a swing roller 42 that is always in contact with the nonwoven fabric 3. The swing roller 42 is rotatably connected to the frame 1 through a connecting rod 43. When the tension of the nonwoven fabric 3 changes, the swing roller 42 is subjected to force and rotates through the connecting rod 43. The elastic member 41 connects the swing roller 42 and the frame 1, and the elastic member 41 provides a force to limit the rotation of the connecting rod 43.

[0039] Specifically, this embodiment differs from existing technologies that require tension detection to determine whether the tension of the nonwoven fabric 3 is appropriate, and then actively adjust the output speed of the nonwoven fabric roll 2. This application uses a swing arm unit 4 to convert the tension of the nonwoven fabric 3 into a pulling force that rotates the swing roller 42. By automatically adjusting the tension of the nonwoven fabric 3, the pushing force transmitted to the nonwoven fabric 3 by the cigarette pack is balanced with the elastic force provided by the elastic member 41, so that the tension of the nonwoven fabric 3 when packaging the cigarette pack is automatically within the required range. The required tension of the nonwoven fabric 3 can be guaranteed by the preset elastic force of the elastic member 41. Of course, the elastic member 41 is preferably a tension spring.

[0040] The oscillating roller 42 always abuts against the nonwoven fabric 3, allowing the nonwoven fabric 3 to be pushed by the cigarette pack, thus increasing the tension. This enables the oscillating roller 42 to overcome its elasticity and oscillate with the nonwoven fabric 3 during the wrapping process, ensuring consistent tension throughout the nonwoven fabric 3. This prevents excessive tension on the nonwoven fabric 3 during the wrapping process, which could cause breakage or tension issues.

[0041] Example 3:

[0042] Unlike Embodiment 2, since the nonwoven fabric 3 needs to be kept taut at all times, to prevent accidental rotation of the nonwoven fabric roll 2 and output of the nonwoven fabric 3, thus loosening the tension of the nonwoven fabric 3 in the entire device, as follows: Figure 3 As shown, the swing arm unit 4 should include a swing arm 44 and a swing roller 42 that is always in contact with the nonwoven fabric 3. The swing arm 44 is rotatably connected to the frame 1, and the swing roller 42 is rotatably connected to the swing shaft of the swing arm 44 via a connecting rod 43. The connecting rod 43 can rotate α° relative to the swing arm 44. The end of the swing arm 44 is connected to the frame 1 via an elastic member 41, which provides a force to limit the rotation of the swing arm 44. This angle α is preferably 30 degrees.

[0043] Specifically, when the tension of the nonwoven fabric 3 is allowed to vary within a certain range, the pulling force of the nonwoven fabric 3 on the oscillating roller 42 allows the oscillating roller to rotate only by overcoming its own weight, without transmitting the tension to the nonwoven fabric roll 2. Only when the tension of the nonwoven fabric 3 is too large, causing the moving angle of the connecting rod 43 of the oscillating roller 42 to be equal to α° relative to the oscillating rod 44, will the oscillating rod 44 also oscillate, thereby subjecting the elastic member 41 to force, and thus causing the oscillating roller 42 to oscillate, dynamically balancing the tension of the entire nonwoven fabric 3. Similarly, the elastic member 41 is preferably a tension spring.

[0044] It should be noted that both the swing arm unit 4 in Embodiment 2 and Embodiment 3 also include several guide rollers 8, such as... Figure 2 and Figure 3As described above, after the nonwoven fabric 3 passes through the guide roller 8, it is possible to wrap the swing roller 42 with the nonwoven fabric 3 at 180 degrees, so that the tension of the nonwoven fabric 3 is converted into the pulling force on the swing roller 42 as much as possible, and the direction of the pulling force is along the tangent direction of the rotation radius of the connecting rod 43 when the swing roller 42 is initially in position.

[0045] Preferably, at least one swing arm unit 4 is provided to control the tension when the nonwoven fabric 3 wraps the cigarette pack.

[0046] Example 4:

[0047] In the technical aspects of Embodiments 2 and 3, the nonwoven fabric roll 2 is connected to a brake via a clutch switch to ensure that during cigarette packaging, the nonwoven fabric roll 2 will not be passively rotated and output nonwoven fabric 3 due to tension or strain on the nonwoven fabric 3, thus ensuring the safety of the device.

[0048] Furthermore, to further ensure the safety and automation of the equipment, a tension sensor is provided at the elastic member 41. The tension sensor is electrically connected to the clutch switch. After the elastic member 41 outputs elastic force, the tension sensor detects the signal and transmits it to the clutch switch, causing the nonwoven fabric roll 2 to disconnect from the brake.

[0049] In this scheme, the brake on the nonwoven fabric roll 2 will only be released when the cigarette pack is pushed forward and the tension of the nonwoven fabric 3 increases, causing the swing arm unit 4 to achieve tension balance. This allows the nonwoven fabric roll 2 to be pulled by the nonwoven fabric 3 and rotate, thus enabling the output of the nonwoven fabric 3.

[0050] Example 5:

[0051] Currently, when the cigarette packaging equipment needs to be unlocked or stopped urgently, the nonwoven fabric roll 2 may not immediately stop conveying the nonwoven fabric 3 due to inertia or signal delay. Consequently, upon the next restart of the equipment, the nonwoven fabric 3 may not be taut or its tension may be inappropriate, preventing the swing arm unit 4 from immediately adjusting the tension. This severely affects the quality assurance of the cigarette pack. To avoid this situation, based on all the above embodiments, such as... Figure 2 and Figure 4 As shown, the entire device also includes a tension compensation roller group 7, which includes a gravity roller 72 and a slide bar 71 mounted on the frame 1. The gravity roller 72 is slidably mounted on the slide bar 71 at both ends, and the gravity roller 72 is always in contact with the nonwoven fabric 3. It should be noted that the tension compensation roller group 7 also includes several guide rollers 8. The guide rollers 8 also allow the nonwoven fabric 3 to wrap around the gravity roller 72 in a 180° angle as much as possible, so that the tension of the nonwoven fabric 3 is converted into an upward thrust on the gravity roller 72.

[0052] In this embodiment, during the entire operation of the equipment, the tension of the nonwoven fabric 3 is dynamically balanced, and the position of the gravity roller 72 remains unchanged. When the equipment stops, the dynamic balance of the tension of the nonwoven fabric 3 stops, and the nonwoven fabric roll 2 stops in time and feeds an extra section of nonwoven fabric 3. At this time, the gravity roller 72 will slide down along the slide bar 71 due to its own weight until it receives the support force of the nonwoven fabric 3 and balances its own weight, thus effectively tightening the nonwoven fabric 3.

[0053] Furthermore, since there are two nonwoven fabric rolls 2, each nonwoven fabric roll 2 is provided with a set of tension compensation rollers 7 to ensure that the tension of the nonwoven fabric 3 reduced by the excess nonwoven fabric 3 output from each nonwoven fabric roll 2 is compensated.

[0054] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A safety device for preventing rollback during film feeding in a cigarette packaging machine, characterized in that, The system includes a nonwoven fabric roll (2), a swing arm unit (4), and a pressure plate unit (5) all mounted on a frame (1). The nonwoven fabric roll (2) passively outputs nonwoven fabric (3) for wrapping cigarette packs. The nonwoven fabric roll (2) rotates by pulling the nonwoven fabric (3). The tension of the nonwoven fabric (3) is adjusted by the swing arm unit (4). The pressure plate unit (5) is used to increase the tension of the nonwoven fabric (3).

2. The safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 1, characterized in that, The nonwoven fabric roll (2) is provided with two sets, upper and lower, and connected at the packaging sealing and cutting platform (6) in the cigarette packaging machine.

3. A safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 2, characterized in that, The swing arm unit (4) includes an elastic member (41) and a swing roller (42) that is always in contact with the nonwoven fabric (3). The swing roller (42) is rotatably connected to the frame (1) via a connecting rod (43). When the tension of the nonwoven fabric (3) changes, the swing roller (42) is subjected to force and rotates through the connecting rod (43). The elastic member (41) connects the swing roller (42) and the frame (1) and provides a force to limit the rotation of the connecting rod (43).

4. A safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 1, characterized in that, The swing arm unit (4) includes a swing arm (44) and a swing roller (42) that is always in contact with the nonwoven fabric (3). The swing arm (44) is rotatably connected to the frame (1). The swing roller (42) is rotatably connected to the swing shaft of the swing arm (44) via a connecting rod (43). The connecting rod (43) can rotate α° relative to the swing arm (44). The end of the swing arm (44) is connected to the frame (1) via an elastic member (41). The elastic member (41) provides a force to limit the rotation of the swing arm (44).

5. A safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 3 or 4, characterized in that, At least one swing arm unit (4) shall be provided.

6. A safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 3 or 4, characterized in that, The nonwoven fabric roll (2) is connected to a brake via a clutch switch.

7. A safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 6, characterized in that, A tension sensor is provided at the elastic member (41). The tension sensor is electrically connected to the clutch switch. After the elastic member (41) outputs elastic force, the tension sensor detects the signal and transmits it to the clutch switch, causing the nonwoven fabric roll (2) to disconnect from the brake.

8. A safety device for preventing rollback during film feeding in a cigarette packaging machine according to claim 1, characterized in that, It also includes a tension compensation roller group (7), which includes a gravity roller (72) and a slide bar (71) set on the frame (1). The two ends of the gravity roller (72) are slidably set on the slide bar (71), and the gravity roller (72) is always in contact with the nonwoven fabric (3).

9. A safety device for preventing film rollback in a cigarette packaging machine according to claim 8, characterized in that, Each of the nonwoven fabric rolls (2) is provided with a set of tension compensation rollers (7).

10. A safety device for preventing film rollback in a cigarette packaging machine according to claim 1, characterized in that, The pressure plate unit (5) includes a pressure strip (52) driven by a telescopic cylinder (51). The telescopic cylinder (51) extends, causing the pressure strip (52) to extend and continuously abut against the nonwoven fabric (3), thereby increasing the tension of the nonwoven fabric (3).

Images