A film packaging bag intermittent cutting device

Abstract

This utility model discloses an intermittent cutting device for film packaging bags, including a frame. Several conveying rollers are arranged at one end of the frame, and a tensioning roller is arranged behind the conveying rollers. The tensioning roller is rotatably connected between swing plates, which are rotatably connected to the upper end of the frame via a rotating shaft. A cutting mechanism is arranged behind the tensioning roller, and carrying rollers are symmetrically arranged on both sides of the cutting mechanism. A drive roller is arranged behind the cutting mechanism, and a winding roller is tangentially arranged behind the drive roller. A tensioning mechanism is arranged on the winding roller. The device features a simple structure, reasonable design, and novel concept. The drive roller pulls the film wrapped around the conveying roller to a certain displacement. Simultaneously, the friction between the film and the conveying roller, combined with the weight of the tensioning roller, tensions the displaced film, ensuring tension during the displacement process. The film is supported by the carrying rollers via an anvil, ensuring that the film is not damaged during intermittent cutting. Before cutting, the cutter uses a needle to make intermittent holes in the film. The film between the holes is then cut with the cutting edge and grooves to form slits. Finally, the winding roller, tangentially contacting the rear of the drive roller, rotates and winds up the film.

Description

Technical Field

[0001] This utility model relates to the field of new materials technology, and in particular to a device for intermittent cutting of film packaging bags. Background Technology

[0002] Plastic packaging bags are a widely used packaging material. They are mainly made of plastic, with common plastics including polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC).

[0003] The production of plastic bags typically involves processes such as extrusion, blown film, heat sealing, and cold sealing. The extrusion process involves heating plastic granules and extruding them into a film using an extrusion molding machine, followed by subsequent processes such as cutting and printing to create plastic bags.

[0004] Traditionally, packaging bags are used individually for easy handling and multiple bags are packaged together into a single unit. However, this packaging structure and bag arrangement have shortcomings. Multiple bags within a single unit can easily become scattered, making subsequent use inconvenient. To make the packaging bags easier to use, they are rolled into a cylindrical shape, and creases are made between adjacent bags before rolling to facilitate tearing and separation. Therefore, this application discloses a film packaging bag intermittent cutting device. Utility Model Content

[0005] The purpose of this invention is to address existing problems by providing a discontinuous cutting device for film packaging bags.

[0006] This utility model is achieved through the following technical solution: a film packaging bag intermittent cutting device, including a frame, a plurality of conveying rollers are arranged at one end of the frame, a tensioning roller is arranged behind the conveying rollers, the tensioning roller is rotatably connected between swing plates, the swing plates are rotatably connected to the upper end of the frame through a rotating shaft, a cutting mechanism is arranged behind the tensioning roller, a bearing roller is symmetrically arranged on both sides of the cutting mechanism, a drive roller is arranged behind the cutting mechanism, a take-up roller is tangentially arranged behind the drive roller, and a tensioning mechanism is arranged on the take-up roller.

[0007] As a further improvement to the above solution, a stop bar is provided on the rear side of the swing plate, and one end of the stop bar is connected to the frame.

[0008] The stop bar ensures that the tension roller and swing plate swing on the front side, preventing the swing plate from rotating to the rear side.

[0009] As a further improvement to the above solution, the cutting mechanism includes a bracket connected to the frame, a base plate mounted on the bracket, an anvil mounted on the base plate, a cutter positioned directly above the anvil, the cutter connected to a blade holder, the blade holder connected to the lower surface of the machine plate, a working rod of a cylinder connected in the middle of the machine plate, the cylinder mounted on the top of the bracket, and guide rods symmetrically arranged on both sides of the machine plate, the lower ends of the guide rods connected to the machine plate.

[0010] The cylinder operates by driving the machine plate, knife holder, and cutter to move up and down via the working rod. The punching needle below the cutter first cuts the film packaging bag horizontally from one side. At the same time, the cutting edge of the cutter, in conjunction with the anvil, cuts the film into linear slits, making it easier to tear. In addition, the machine plate is guided by the guide rod to ensure that both ends of the machine plate move horizontally at the same time during the up and down movement.

[0011] As a further improvement to the above solution, the cutting board is provided with a cutting groove to facilitate the cutting edge of the knife to make cuts on the film.

[0012] As a further improvement to the above solution, the cutting blade is inclined with a cutting edge, and several piercing needles are vertically and spaced apart below the cutting edge;

[0013] The angled blade is used to cut one side of the film packaging bag first. As the cutter presses down, it cuts horizontally along the edge of the film packaging bag. At the same time, the punching needle moves down with the cutter to punch holes in the film packaging bag at intervals. There are cut marks between the holes made by the cutter and the cutting groove, which makes it easy to tear.

[0014] As a further improvement to the above solution, the take-up roller is symmetrically connected to end shafts at both ends, the end shafts are slidably disposed in the slide groove, the slide groove is inclinedly disposed in the wall plate, and the wall plate is symmetrically connected to the frame.

[0015] The sliding displacement of the end shafts at both ends of the take-up roller in the slide groove ensures that the take-up roller or the film packaging bag wound on the take-up roller is always tangential and in contact with the drive roller under its own weight and the force of the tensioning mechanism.

[0016] As a further improvement to the above solution, the end shaft is symmetrically fitted with a bushing and a tensioning mechanism, and the bushing and tensioning mechanism are symmetrically arranged on the inner and outer sides of the wall panel.

[0017] The bushing is fitted onto the end shaft to ensure that the take-up roller is not obstructed during rotation, thus avoiding friction between the end face of the take-up roller and the wall panel. At the same time, the outer tensioning mechanism always exerts a downward force on the end shaft.

[0018] As a further improvement to the above solution, the tensioning mechanism includes a collar, with a pull plate one connected below the collar, the upper end of a spring hanging on the pull plate one, the lower end of the spring hanging on a pull plate two, and the pull plate two connected to the frame.

[0019] Pull plate two is fixed on the frame, and the tension of the spring acts on pull plate one and collar. The spring force always acts on collar, ensuring that collar has a driving force to move downward.

[0020] As a further improvement to the above solution, the drive roller is rotatably mounted on the frame, and a pulley is sleeved on the end shaft at one end of the drive roller. The pulley is connected to the main pulley via a belt, and the main pulley is sleeved on the output shaft of the motor.

[0021] The motor drives the main pulley to rotate, which in turn drives the slave pulley to rotate via a belt. This, in turn, drives the drive roller to rotate on the frame, thus displacing the film packaging bag that passes over the drive roller.

[0022] Compared with the prior art, this utility model has the following advantages: it has a simple structure, reasonable design, and novel and unique concept. The film wrapped around the conveyor roller is displaced by the drive roller. At the same time, the friction between the film and the conveyor roller, together with the weight of the tension roller, tensions the displaced film, so that the film is tensioned during the displacement process. The film is supported by the anvil and the bearing roller, which ensures that the film will not be damaged during the intermittent cutting process. At the same time, before cutting, the cutter makes holes at intervals on the film by the punch needle. The film between the holes is then cut into the groove by the cutting edge of the cutter. Then, the take-up roller, which is in tangential contact with the rear side of the drive roller, rotates to take up the film. As the thickness of the film increases during winding, the end shaft of the take-up roller slides in the groove. The tensioning mechanism ensures that the take-up roller has sufficient driving force to rotate in contact with the drive roller. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the cutting mechanism.

[0025] Figure 3 This is a schematic diagram of the winding mechanism.

[0026] Figure 4 This is a schematic diagram of the tensioning mechanism.

[0027] Figure 5 This is a schematic diagram of the displacement of the film packaging bag. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figures 1 to 5As shown, a film packaging bag intermittent cutting device includes a frame 1. At least two conveying rollers 2 are arranged in parallel at one end of the frame 1. A tensioning roller 3 is arranged behind the conveying rollers 2. The tensioning roller 3 is rotatably connected between swing plates 4. The swing plates 4 are rotatably connected to the upper end of the frame 1 through a rotating shaft. A cutting mechanism 7 is arranged behind the tensioning roller 3. Carrying rollers 5 are symmetrically arranged on both sides of the cutting mechanism 7. A drive roller 8 is arranged behind the cutting mechanism 7. A take-up roller 13 is arranged tangentially behind the drive roller 8. A tensioning mechanism 19 is arranged on the take-up roller 13.

[0030] As a further improvement to the above solution, a stop rod 14 is provided on the rear side of the swing plate 4, and one end of the stop rod 14 is connected to the frame 1.

[0031] The stop bar 14 ensures that the tension roller 3 and the swing plate 4 swing in the front, preventing the swing plate 4 from rotating to the rear.

[0032] As a further improvement to the above solution, the cutting mechanism 7 includes a bracket 71, which is connected to the frame 1. A base plate 72 is installed on the bracket 71, and an anvil 70 is installed on the base plate 72. A cutter 74 is arranged directly above the anvil 70 and is connected to a knife holder 75. The knife holder 75 is connected to the lower surface of the machine plate 76. The working rod of the cylinder 77 is connected in the middle of the machine plate 76. The cylinder 77 is installed on the top of the bracket 71. Guide rods 78 are symmetrically arranged on both sides of the machine plate 76, and the lower end of the guide rods 78 is connected to the machine plate 76.

[0033] The cylinder 77 drives the machine plate 76, the knife holder 75 and the cutter 74 to move up and down via the working rod. The punch 79 below the cutter 74 first cuts the film packaging bag horizontally from one side. At the same time, the cutting edge of the cutter 74, together with the anvil 70, cuts the film into linear cuts, which is easy to tear. In addition, the machine plate 76 is guided by the guide rod 78 to ensure that both ends of the machine plate 76 move horizontally during the up and down movement.

[0034] As a further improvement to the above solution, the cutting board 70 is provided with a cutting groove 73 to facilitate the cutting edge of the cutter 74 to cut the film.

[0035] As a further improvement to the above solution, the cutting blade 74 is inclined with a cutting edge, and several piercing needles 79 are vertically and spaced apart below the cutting edge;

[0036] The inclined blade first cuts one side of the film packaging bag. As the cutter 74 presses down, it cuts horizontally along the film packaging bag. At the same time, the puncturing needle 79 moves down with the cutter 74 to puncture the film packaging bag at intervals. The holes are marked by the cutter 74 and the cutting groove 73, making it easy to tear.

[0037] As a further improvement to the above solution, the take-up roller 13 is symmetrically connected to the end shaft 15 at both ends, the end shaft 15 is slidably disposed in the slide groove 16, the slide groove 16 is inclinedly disposed in the wall plate 18, and the wall plate 18 is symmetrically connected to the frame 1.

[0038] The sliding displacement of the end shafts 15 at both ends of the take-up roller 13 in the slide groove 16 ensures that the take-up roller 13 or the film packaging bag wound on the take-up roller 13 is always tangential and in contact with the drive roller 8 under its own weight and the force of the tensioning mechanism 19.

[0039] As a further improvement to the above solution, the end shaft 15 is symmetrically fitted with a bushing 17 and a tensioning mechanism 19, and the bushing 17 and the tensioning mechanism 19 are symmetrically arranged on the inner and outer sides of the wall panel 18.

[0040] The bushing 17 is fitted onto the end shaft 15 to ensure that the winding roller 13 is not obstructed during rotation, and to prevent the end face of the winding roller 13 from interacting with the wall panel 18 and causing friction. At the same time, the outer tensioning mechanism 19 pulls the end shaft 15 with a downward displacement force.

[0041] As a further improvement to the above solution, the tensioning mechanism 19 includes a collar 20, with a pull plate 21 connected below the collar 20. The upper end of a spring 22 is hung on the pull plate 21, and the lower end of the spring 22 is hung on a pull plate 23. The pull plate 23 is connected to the frame 1.

[0042] Pull plate 23 is fixed on frame 1. The tension of spring 22 acts on pull plate 21 and collar 20. The force of spring 22 always acts on collar 20, ensuring that collar 20 has a driving force to move downward.

[0043] As a further improvement to the above solution, the drive roller 8 is rotatably mounted on the frame 1, and a pulley 9 is sleeved on the end shaft 15 at one end of the drive roller 8. The pulley 9 is connected to the main pulley 11 through the belt 10, and the main pulley 11 is sleeved on the output shaft 12 of the motor.

[0044] The motor drives the main pulley 11 to rotate, and the main pulley 11 drives the slave pulley 9 to rotate via the belt. At the same time, it drives the drive roller 8 to rotate on the frame 1, thereby driving the film packaging bag that passes over the drive roller 8 to move.

[0045] The working principle of a film packaging bag intermittent cutting device is as follows: The film wrapped around the conveyor roller 2 is displaced by the drive roller 8. At the same time, the friction between the film and the conveyor roller 2, together with the weight of the tension roller 3, tensions the displaced film, so that the film is tensioned during the displacement process. The film is supported by the support roller 5 through the anvil 70 to ensure that the film is not damaged during the intermittent cutting process. At the same time, before cutting, the cutter 74 makes intermittent holes on the film by the punch needle 79. The film between the holes is then cut into the groove 73 by the cutting edge of the cutter 74. Then, the take-up roller 13, which is in tangential contact with the rear side of the drive roller 8, rotates to take up the film. As the thickness of the film increases during winding, the end shaft 15 of the take-up roller 13 slides in the groove 16. The take-up roller 13 is ensured to have sufficient driving force to rotate in contact with the drive roller 8 by the tensioning mechanism 19.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thin film packaging bag intermittent cutting apparatus comprising a frame, characterized by, Several conveying rollers are provided at one end of the frame, and a tensioning roller is provided behind the conveying rollers. The tensioning roller is rotatably connected between the swing plates. The swing plates are rotatably connected to the upper end of the frame through a rotating shaft. A cutting mechanism is provided behind the tensioning roller. Carrying rollers are symmetrically arranged on both sides of the cutting mechanism. A drive roller is provided behind the cutting mechanism. A take-up roller is tangentially arranged behind the drive roller. A tensioning mechanism is provided on the take-up roller.

2. A device for intermittent cutting of a film packaging bag according to claim 1, characterized in that A stop bar is provided on the rear side of the swing plate, and one end of the stop bar is connected to the frame.

3. A device for intermittent cutting of a film packaging bag according to claim 1, characterized in that The cutting mechanism includes a bracket connected to a machine frame. A base plate is mounted on the bracket, and an anvil is mounted on the base plate. A cutter is positioned directly above the anvil and is connected to a blade holder. The blade holder is connected to the lower surface of the machine plate. A cylinder's working rod is connected to the middle of the machine plate, and the cylinder is mounted on the top of the bracket. Guide rods are symmetrically arranged on both sides of the machine plate, and the lower ends of the guide rods are connected to the machine plate.

4. A device for intermittent cutting of a film packaging bag according to claim 3, characterized in that The cutting board is provided with cutting grooves.

5. The intermittent cutting apparatus for a film packaging bag according to claim 3, wherein The cutting blade is inclined with a cutting edge, and several needles are vertically spaced below the cutting edge.

6. A thin film packaging bag intermittent cutting apparatus according to claim 1, wherein The take-up roller is symmetrically connected to end shafts at both ends. The end shafts are slidably disposed in the slide groove, which is inclinedly disposed in the wall panel. The wall panel is symmetrically connected to the frame.

7. A device for intermittent cutting of a film packaging bag according to claim 6, characterized in that The end shaft is symmetrically fitted with a bushing and a tensioning mechanism, which are symmetrically arranged on the inner and outer sides of the wall panel.

8. A thin film packaging bag intermittent cutting apparatus according to claim 7, wherein The tensioning mechanism includes a collar, with a first pull plate connected below the collar. The upper end of a spring is hung on the first pull plate, and the lower end of the spring is hung on a second pull plate. The second pull plate is connected to the frame.

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